IAU Circulars (IAUCs) - циркуляры МАС - 02/2010

[Tikhon]

1 February 2010
IAU Electronic Telegram No.2159

--------------------------------------------------------------------------------
SUPERNOVA 2010T
--------------------------------------------------------------------------------

G. Pignata, M. Cifuentes, Universidad Andres Bello; J. Maza, M. Hamuy,
R. Antezana, L. Gonzalez, P. Gonzalez, P. Lopez, S. Silva, G. Folatelli, R.
Cartier, F. Forster, S. Marchi, and A. Rojas, Universidad de Chile; B. Conuel,
Wesleyan University; and D. Reichart, K. Ivarsen, J. Haislip, A. Crain, D.
Foster, M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel
Hill, on behalf of the CHASE project, report the discovery of an apparent
supernova (mag approximately 18.2 +/- 0.4) on an unfiltered image taken on
Jan. 25.30 UT with the 0.41-m 'PROMPT 4' telescope located at Cerro Tololo.
The new object, which is also present at mag approximately 18.4 in an image
taken on Jan. 29.26, is located at R.A. = 13h14m47s.88 +/- 0".1, Decl. =
-15o58'24".8 +/- 0".1 (equinox 2000.0), which is about 1".9 east and 2".3
south of center of the apparent host galaxy. Nothing is visible at this
position on archival images taken on 2010 Jan. 2.31 (limiting mag 18.5) or
in a stack of twenty 40-s images taken between 2008 Dec. 26.33 and 2009 Jun.
25.05 (limiting mag 20.5).

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 1 (CBET 2159) Daniel W. E. Green

[Tikhon]

4 February 2010
IAU Electronic Telegram No.2160

--------------------------------------------------------------------------------
COMET 29P/SCHWASSMANN-WACHMANN
--------------------------------------------------------------------------------

J. M. Trigo-Rodriguez, Consejo Superior de Investigaciones Cientificas
and Institut d'Estudis Espacial de Catalunya, suggests that comet 29P is
currently experiencing an unusual outburst. His analysis of multi-band
images taken on Feb. 3.181 UT by A. Sanchez (Gualba, Spain, 0.31-m reflector)
shows a stellar appearance with an apparent diameter of 15" and the following
magnitudes measured through a 10" aperture: V = 11.9, R = 11.7, I = 11.5.
F. Colas and L. Maquet, IMCCE, Observatoire de Paris, report that resolved
coma images obtained with the Pic du Midi 1-m reflector) on Feb. 3.96 show a
coma diameter of 10"; when combined with a typical ejection velocity of 300
m/s, this suggests that the outburst occurred around Feb. 2.52. Additional
observations obtained in the last month suggest a progressive increase in
activity since mid-January, from an inactive 40-day period in which the comet
remained close to R magnitude 16 in a 10" aperture. Additional recent 10"-
aperture magnitudes for comet 29P supplied by Trigo-Rodriguez: 2009 Dec.
20.04, R = 16.4 (Trigo-Rodriguez, Montseny, Spain, 0.18-m reflector); Dec.
25.25, R = 16.1, I = 15.9 (Sanchez); 2010 Jan. 9.97, V = 15.7, R = 15.0, I =
15.4 (S. Pastor and J. A. Reyes, Molina de Segura, Spain, 0.40-m reflector);
Jan. 10.07, R = 15.6 (Sanchez); Jan. 12.19, R = 15.7 (Sanchez); Jan. 27.18,
R = 15.2 (Sanchez); Jan. 27.18, R = 15.1, I = 15.2 (D. Rodriguez, Villalba-
Madrid, Spain, 0.25-m reflector). Colas provides the following additional
magnitudes for 29P: Feb. 3.87, R = 11.6 (F. Kugel, Chante Perdrix
Observatory, Dauban, France; 0.20-m presumed); Feb. 4.02, R = 11.7 (Pic du
Midi).
Recent visual total-magnitude and coma-diameter estimates reported to
the Central Bureau: 2009 Sept. 23.19 UT, 11.7, 0'.7 (J. J. Gonzalez, Leon,
Spain, 0.20-m reflector); 29.20, 11.5, 1'.5 (Gonzalez); Oct. 26.21, 11.3, 3'
(Gonzalez; zodiacal light); Nov. 14.28, 11.9, 1'.5 (M. Goiato, Aracatuba,
Brazil, 0.22-m reflector); 18.11, 11.8, 0'.6 (Gonzalez); 24.14, 11.9, 1'.5
(Gonzalez); 25.72, 13.2, 0'.8 (C. Wyatt, Walcha, NSW, Australia, 0.25-m
reflector); Dec. 12.15, 12.0, 2' (J. J. Gonzalez, Leon, Spain, 0.20-m
reflector); Feb. 4.06, 11.5, 0'.4 (Goiato). Recent total unfiltered CCD
magnitude estimates submitted by K. Kadota (Ageo, Saitama-ken, Japan,
0.25-m reflector) in the course of his cometary astrometry program: 2009
Oct. 30.80, 13.2; Nov. 30.75, 12.8; Dec. 30.66, 12.0; 2010 Jan. 11.68, 13.6.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 4 (CBET 2160) Daniel W. E. Green

[Tikhon]

6 February 2010
IAU Electronic Telegram No.2161

--------------------------------------------------------------------------------
SUPERNOVA 2010U IN NGC 4214
--------------------------------------------------------------------------------

S. Nakano, Sumoto, Japan, reports the discovery by Koichi Itagaki
(Teppo-cho, Yamagata, Japan) of an apparent supernova (mag 16.0) on a 20-s
unfiltered CCD frame taken on Feb. 5.634 UT using a 0.30-m f/7.8 reflector
(+ Bitran BT-214E camera) at the Takanezawa station, Tochigi-ken; Itagaki
confirmed the new object at mag 15.9 on Feb. 6.568. SN 2010U is located at
R.A. = 12h15m41s.06, Decl. = +36d20'02".9 (equinox 2000.0), which is 20"
east and 27" north of the center of NGC 4214. Nothing is visible at this
position on Itagaki's image from Jan. 24.74 (limiting mag 18.0) or on the
Digitized Sky Survey. His discovery image is posted at the following
website URL: http://www.k-itagaki.jp/images/psn-4214.jpg. Nakano also
notes that confirming unfiltered 120-s exposures (limiting mag 19.4-19.5)
were taken by K. Kadota (Ageo, Japan, 0.25-m f/5 reflector + SBIG ST-9E
CCD camera), yielding mag 16.3 on Feb. 5.710 and 6.664, with position end
figures 41s.07 +/- 0s.01, 02".4 +/- 0".2 for 2010U.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 6 (CBET 2161) Daniel W. E. Green

[Tikhon]

7 February 2010
IAU Electronic Telegram No.2162

--------------------------------------------------------------------------------
SUPERNOVA 2010V IN PGC 51710
--------------------------------------------------------------------------------

Further to CBET 2111, V. Lipunov, Sternberg Astronomical Institute,
reports the discovery by Pavel Balanutsa of an apparent supernova (magnitude
R = 14.3) on four CCD images (limiting mag 18.6) taken during Feb. 4.096-4.13
UT with the MASTER robotic-telescopes network at Kislovodsk. The new object
is located at R.A. = 14h28m38s.46, Decl. = +30d38'09".5 (equinox 2000.0),
which is 1" west and 4".5 south of the center of PGC 51710. Nothing is
visible at this position on images taken on 2004 May 14.9 (limiting
unfiltered mag about 19.0). Images of 2010V have been posted at website URL
http://observ.pereplet.ru/images/SN04feb10/SN100204.jpg. Following posting
on the Central Bureau's unconfirmed-objects webpage, M. Nissinen and V.-P.
Hentunen (Varkaus, Finland) report that they obtained confirming images
(limiting red mag 17.2) of 2010V on 2010 Feb. 7.35 UT remotely with the
GRAS004 Epsilon 25-cm f/3.4 Global-Rent-a-Scope telescope (+ SBIG ST-10 CCD
camera) near Mayhill, NM, USA, yielding magnitude R = 15.3 +/- 0.1 and
position end figures 38s.53, 09".7; they comment that a better offset is
5".9 west and 4".6 north of the center of the galaxy PGC 51710, adding
that nothing is visible at this position on a red Digitized Sky Survey (DSS)
plate. They have posted their image of 2010V at the following website URL:
http://cutenews.kassiopeia.net/data/upi ... c51710.png. T. Yusa (Osaki,
Miyagi-ken, Japan) also obtained 120-s unfiltered CCD images (limiting mag
18.5) of 2010V remotely with a 25-cm f/3.4 reflector at the same RAS
Observatory site, yielding mag 16.2 on Feb. 7.419 and mag 16.0 on Feb.
7.444, with position end figures 38s.44 +/- 0s.01, 09".4 +/- 0".1 (and offset
7".6 west, 5".8 north), adding that nothing is visible at this position on
DSS images from 1950 Dec. 4 and 1991 Apr. 17 (red plate). Yusa has posted
his image at website URL http://space.geocities.jp/yusastar/PSN100207.htm.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 7 (CBET 2162) Daniel W. E. Green

[Tikhon]

7 February 2010
IAU Electronic Telegram No.2163

--------------------------------------------------------------------------------
SUPERNOVA 2010U IN NGC 4214
--------------------------------------------------------------------------------

G. H. Marion, Texas A&M University and University of Texas; J. Vinko,
University of Szeged; and J. C. Wheeler, University of Texas, report that a
spectrum of 2010U (cf. CBET 2161) was obtained on Feb. 7.3 UT with the 9.2-m
Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) by M.
Shetrone. The spectrum is dominated by a blue continuum with strong, narrow
P-Cyg emission features of H I, Ca II, Na I, and possibly O I. The spectrum
shows strong resemblance to those of luminous blue variable (LBV) outbursts
("supernova impostors"; e.g., Van Dyk et al. 2000, PASP 112, 1532; Smith et
al. 2009, Ap.J. 697, L49). The absolute magnitude of the transient (using
the host-galaxy distance of 3.3 Mpc from NED) is -11.7, which is typical for
such events. The expansion velocity, calculated from the minimum of the
narrow P-Cyg features, is about 900 km/s, which also supports the
classification.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 7 (CBET 2163) Daniel W. E. Green

[Tikhon]

7 February 2010
IAU Electronic Telegram No.2164

--------------------------------------------------------------------------------
SUPERNOVAE 2009mx AND 2009my
--------------------------------------------------------------------------------

D. Milisavljevic and R. Fesen, Dartmouth College, report that a low-
dispersion spectrum (range 430-790 nm) of 2009mx (cf. CBETs 2095, 2120),
taken on Feb. 6.4 UT with the 2.4-m Hiltner telescope (+ CCDS) at MDM
Observatory, supports a type-Ia supernova classification. Comparison
with a library of supernova spectra using the "Supernova Identification"
tool (SNID; Blondin and Tonry 2007, ApJ., 666, 1024) provides a good match
with the type-Ia event 1991bg at approximately 54 days post-maximum light.
Spectra of 2009my (CBETs 2095, 2120) show it to be a type-II supernova
approximately 2 months after maximum light; SNID comparison templates best
match the type-IIP event 2006bp at 65 days post-maximum.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 7 (CBET 2164) Daniel W. E. Green

[Tikhon]

8 February 2010
IAU Electronic Telegram No.2165

--------------------------------------------------------------------------------
SUPERNOVA 2010W IN PGC 37549
--------------------------------------------------------------------------------

L. A. G. Monard, Pretoria, South Africa, reports the discovery of an
apparent supernova (magnitude 16.7 +/- 0.2) on four unfiltered CCD images
taken on Feb. 7.075 UT at the Bronberg Observatory. The new object, which
was confirmed at mag 16.6 on images taken by Monard on Feb. 7.878, is
located at R.A. = 11h56m48s.07, Decl. = -38d11'11".3 (equinox 2000.0), which
is 18" east and 22" north of the core of the Sc-type galaxy PGC 37549 (= ESO
320-35). Nothing is visible at this position in red Digitized Sky Survey
images down to mag 20.5, on Monard's previous image of this galaxy taken on
2009 Dec. 16.068 (limiting mag 18.7), or on his earlier images. J.
Brimacombe, Cairns, Australia, reports a confirmation of 2010W at mag 17.4
on eight co-added 600-s images (limiting magnitude 20) taken remotely with a
32-cm reflector (+ STL6K camera) at the Macedon Ranges Observatory, near
Melbourne, Australia, on Feb. 8.65; he has posted his image of 2010W at
website URL http://www.flickr.com/photos/43846774@N02/4338884018/.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 8 (CBET 2165) Daniel W. E. Green

[Tikhon]

8 February 2010
IAU Electronic Telegram No.2166

--------------------------------------------------------------------------------
SUPERNOVA 2010X IN NGC 1573A
--------------------------------------------------------------------------------

D. Rich, Hampden, ME, U.S.A., reports his discovery of an apparent
supernova (mag about 16.7) on unfiltered CCD frames taken with a 0.41-m
reflector on Feb. 7.07 UT, with a confirming image obtained on Feb. 8.09
by P. Burke, Pittsfield, ME, U.S.A., with a 0.31-m reflector that shows
2010X at mag about 16.6. The new object is located at R.A. = 4h48m27s.90,
Decl. = +73o28'14".8 (equinox 2000.0), which is about 4".4 east and 6".0
north of the center of NGC 1573A. Nothing is visible at this location on a
CCD frame taken by Rich on 2009 Dec. 13.10 (limiting mag about 18.8) or on
Palomar Digital Sky Survey images from 1996 Dec. 7 (limiting red mag about
20.5) and 1995 Nov. 22 (limiting blue mag about 21.0).

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 8 (CBET 2166) Daniel W. E. Green

[Tikhon]

8 February 2010
IAU Electronic Telegram No.2167

--------------------------------------------------------------------------------
SUPERNOVAE 2010V AND 2010X
--------------------------------------------------------------------------------

D. Milisavljevic and R. Fesen, Dartmouth College, report that
low-dispersion optical spectra (range 430-790 nm) of 2010V (cf. CBET 2162)
and 2010X (CBET 2166) were obtained with the 2.4-m Hiltner telescope (+
CCDS) at MDM Observatory on Feb. 8.4 UT. Comparison with a library of
supernova spectra using the "Supernova Identification" tool (SNID; Blondin
and Tonry 2007, ApJ., 666, 1024) shows that the spectrum of 2010V closely
matches that of the type-Ia normal supernova 2002bo at approximately 24
days post-maximum light; the spectrum of 2010X resembles the type-Ic
supernovae 1994I and 2004aw at a few days before maximum light.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 8 (CBET 2167) Daniel W. E. Green

[Tikhon]

9 February 2010
IAU Electronic Telegram No.2168

--------------------------------------------------------------------------------
SUPERNOVA 2010Y IN NGC 3392
--------------------------------------------------------------------------------

Giancarlo Cortini, Predappio, Italy, reports the discovery an apparent
supernova (mag about 15.9) on several unfiltered CCD images (limiting mag
near 18.5) taken on Feb. 8.87 UT during his supernova-search program with a
0.35-m telescope at Monte Maggiore Observatory. The new object is located at
R.A. = 10h51m03s.95, Decl. = +65d46'47" (equinox 2000.0) which is 15" east
and 7" south of the center of the galaxy NGC 3392. Nothing is visible at
this position on his previous image of the same field taken on 2009 Dec.
27.81 (limiting mag about 18.5) or on Palomar Sky Survey red and blue plates.
Following posting on the Central Bureau's unconfirmed-objects webpage,
D. Milisavljevic and R. Fesen, Dartmouth College, report confirmation of
2010Y as a supernova, based on low-dispersion optical spectra (range
430-790 nm) obtained with the 2.4-m Hiltner telescope (+ CCDS) at MDM
Observatory on Feb. 9.3 UT. Comparison with a library of supernova spectra
using the "Supernova Identification" tool (SNID; Blondin and Tonry 2007,
Ap.J. 666, 1024) shows that the spectrum closely matches that of the type-Ia
supernova 1994D approximately one week before maximum light. Weak C II
658.0-nm absorption is visible.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 9 (CBET 2168) Daniel W. E. Green

[Tikhon]

10 February 2010
IAU Electronic Telegram No.2169

--------------------------------------------------------------------------------
SUPERNOVA 2010Z IN NGC 2797
--------------------------------------------------------------------------------

Independent discovery reports have been received for an apparent
supernova in NGC 2797.
Further to CBET 2130, X. Parisky, S. B. Cenko, W. Li, and A. V.
Filippenko, University of California, report the LOSS discovery of the
new object, designated 2010Z, on unfiltered KAIT images. Also, Simone
Leonini, Siena, Italy, reports the discovery of 2010Z on an unfiltered CCD
image (limiting mag about 18.8) taken during his supernova search program
using a 0.53-m f/7.8 Ritchey-Chretien telescope (+ Apogee Alta U47 CCD
camera) at the Montarrenti Observatory. The discovery observations are
tabulated below:

2010 UT R.A. (2000.0) Decl. Mag. Offset Observer
Feb. 3.34 9 16 21.30 +17 43 40.6 16.7 5".4 W, 2".4 N KAIT
Feb. 8.896 9 16 21.25 +17 43 42.4 15.6 8" W, 4" N Leonini

Additional approximate magnitudes for 2010Z: 2008 Dec. 30.039, [18.5
(Leonini); 2010 Jan. 15.43 UT, [18.1 (KAIT); Feb. 5.51, 17.0 (J. Brimacombe,
Cairns, Australia; co-added image from six 600-s unfiltered images taken
remotely with a 0.5-m telescope located near Mayhill, NM, U.S.A.). Leonini
adds that nothing is visible at this position on Palomar Sky Survey
infrared, red, and blue plates.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 10 (CBET 2169) Daniel W. E. Green

[Tikhon]

10 February 2010
IAU Electronic Telegram No.2170

--------------------------------------------------------------------------------
APPARENT NOVAE IN M81: M81N 2010-01a AND M81N 2010-01b
--------------------------------------------------------------------------------

K. Hornoch, Astronomical Institute, Ondrejov; J. Prieto, Carnegie
Observatories; R. Khan and O. Pejcha, Department of Astronomy, Ohio State
University; J. Gorosabel and M. Jelinek, Instituto de Astrofisica de
Andalucia, Consejo Superior de Investigaciones Cientificas; and P. Kubanek,
Image Processing Laboratory, Universidad de Valencia, report the discovery
of another apparent nova in the galaxy M81 on CCD frames taken with RETROCAM
on the 2.4-m Hiltner telescope at MDM observatory and with ALFOSC on the
2.6-m Nordic Optical Telescope at La Palma. The new object, designated M81N
2010-01b, was first marginally detected on two co-added 600-s Sloan r' CCD
frames taken by Prieto and Khan with the 2.4-m Hiltner telescope on Jan.
14.394 and 14.407 UT. The third detection was made on a co-added 900-s
narrow-band H-alpha CCD frame taken by Gorosabel, Jelinek, and Kubanek with
the 2.6-m Nordic Optical Telescope during IAA time on Jan. 17.218.
The apparent nova was definitely confirmed on co-added 600-s Sloan r' CCD
frame taken by J. A. L. Aguerri (Instituto de Astrofisica de Canarias) and
R. Sanchez-Janssen (European Southern Observatory) with the 2.6-m Nordic
Optical Telescope (+ ALFOSC) on Jan. 21.292; and on a co-added 1200-s
narrow-band H-alpha CCD frame taken by G. Jozsa and P. Serra (Netherlands
Foundation Research in Astronomy) of the HALOGAS (Hydrogen Accretion in LOcal
GAlaxieS) survey team, with the 2.5-m Isaac Newton Telescope (+ WFC) on Feb.
4.125. M81N 2010-01b is located at R.A. = 9h55m35s.16, Decl. = +69o03'30".4
(equinox 2000.0), which is 10".7 east and 24".7 south of the center of M81.
Nothing is present at this position on numerous archive images from the
2.54-m Isaac Newton Telescope, the 4.2-m William Herschel Telescope, the 4-m
Mayall telescope, and the 8.2-m Subaru telescope, down to limiting magnitudes
as faint as Sloan r' = 23.0, R = 23.1, V = 23.4, and H-alpha = 21.3.
Available Sloan r' and H-alpha magnitudes for nova M81N 2010-01b, as measured
by Hornoch: Jan. 8.333, [22.2 (Prieto and Khan, 2.4-m Hiltner telescope +
Sloan r' filter); 14.394, r' = 20.9: (Prieto and Khan); 14.407, r' = 20.7:
(Prieto and Khan); 17.218, H-alpha = 18.8 +/- 0.3 (Gorosabel, Jelinek, and
Kubanek, 2.6-m Nordic Optical Telescope); 21.292, r' = 21.5 +/- 0.3 (Aguerri
and Sanchez-Janssen, 2.6-m Nordic Optical Telescope); 31.999, [21.7 (Kubanek,
N. Morales, J. L. Ortiz, Gorosabel, and Jelinek, 1.23-m telescope at Calar
Alto + R filter); Feb. 4.125, H-alpha = 20.5 +/- 0.3 (Jozsa and Serra, 2.5-m
Isaac Newton Telescope).
Hornoch et al. also report additional magnitudes for M81N 2010-01a (cf.
CBET 2132), measured by Hornoch: Jan. 21.292, r' = 21.0 +/- 0.15 (Aguerri
and Sanchez-Janssen, 2.6-m Nordic Optical Telescope); 28.961, R = 21.3 +/-
0.3 (Kubanek, Morales, Ortiz, Gorosabel, and Jelinek, 1.23-m telescope);
31.012, R = 21.3 +/- 0.3 (Kubanek, Morales, Ortiz, Gorosabel, and Jelinek);
31.999, R = 21.6 +/- 0.3 (Kubanek, Morales, Ortiz, Gorosabel, and Jelinek);
Feb. 3.190, R = 21.7: (Kubanek, Morales, Ortiz, Gorosabel, and Jelinek);
4.125, H-alpha = 20.0 +/- 0.15 (Jozsa and Serra, 2.5-m Isaac Newton
Telescope).

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 10 (CBET 2170) Daniel W. E. Green

[Tikhon]

10 February 2010
IAU Electronic Telegram No.2171

--------------------------------------------------------------------------------
SUPERNOVA 2010aa IN NGC 692
--------------------------------------------------------------------------------

L. A. G. Monard, Pretoria, South Africa, reports his discovery of an
apparent supernova (magnitude 16.4 +/- 0.2) on six unfiltered CCD images
obtained on Feb. 9.771 UT at the Bronberg Observatory, the position of the
new object given as R.A. = 1h48m43s.21, Decl. = -48d39'00".7 (equinox 2000.0),
which is 11" east and 7" south of the core of the type-Sbc galaxy NGC 692.
Nothing is visible at this position Digitized Sky Survey images (limiting red
mag 20.5), on the previous image of this galaxy taken at the Bronberg
Observatory on 2009 Dec. 17.793 (limiting mag 18.7), or on earlier images by
Monard. Monard also discovered the type-Ia supernova 2007st (cf. CBETs 1177,
1190) in this galaxy. Following posting on the Central Bureau's unconfirmed-
objects webpage, P. Marples (Loganholme, Queensland, Australia) writes that
S. Parker (Oxford, Canterbury, New Zealand) found that 2010aa is clearly
visible at red mag 15.7 in a prediscovery CCD image taken by Parker using a
35-cm Celestron C14 Schmidt-Cassegrain reflector on 2010 Feb. 4.443; the
magnitude and position end figures 43s.24, 01".3 were measured by C. Drescher
(Calamvale, Queensland, Australia) using Astrometrica with the USNO-B1.0
catalogue, from Parker's image.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 10 (CBET 2171) Daniel W. E. Green

[Tikhon]

19 February 2010
IAU Electronic Telegram No.2176

--------------------------------------------------------------------------------
PROBABLE NOVA IN OPHIUCHUS
--------------------------------------------------------------------------------

S. Nakano, Sumoto, Japan, reports the discovery by Hideo Nishimura
(Miyawaki, Kakegawa, Shizuoka-ken, Japan) of a 9th-magnitude possible nova
on two 13-s frames taken on Feb. 18.845 UT using a Minolta 120-mm f/3.5 lens
and a Canon EOS 5D Digital camera mounted on a Takahashi EM100 equatorial
telescope. Nakano measured limiting mag 12.7 from Nishimura's JPEG image,
mag 9.4 for the variable, and the following precise position (uncertainty
+/- 4"): R.A. = 17h26m32s.19, Decl. = -28d49'36".3 (equinox 2000.0).
Nishimura notes that nothing is visible at this position on his frames taken
during each month in the span 2009 Feb.-Oct. 15 and on 2010 Feb. 2, 4, 5,
7, and 13.84 UT (limiting mag 11). Nakano forwards the following position
end figures for the presumed nova from an unfiltered CCD exposure taken by
K. Itagaki on Feb. 19.778 using a 0.30-m f/7.8 reflector (+ Bitran BT-214E
CCD camera) at the Takanezawa station, Tochigi-ken, Japan: 32s.08, 38".5
(magnitude 9.0); his image is posted at the following website URL:
http://www.k-itagaki.jp/images/pn-oph.jpg. Nakano further notes that K.
Kadota (Ageo, Japan, 0.25-m f/5 reflector + SBIG ST-9E CCD camera)
measured mag 8.9 and position end figures 32s.11, 39".0 from four 4-s
exposures (limiting mag 16.5) taken on Feb. 19.825.
After posting on the Central Bureau's unconfirmed-objects webpage, R.
Kaufman (Bright, Victoria, Australia) writes that a green-channel unfiltered
DSLR image taken with a Canon 400D camera on Feb. 15.651 and 15.656 shows
the probable nova at mag approximately mag 9.4 (close to the V band). An
image by Kaufman taken with a 55-mm f/4 camera lens (three stacked 30-s
frames) is visible via the following website URL: http://tinyurl.com/yfol3nu.
S. Kiyota (Tsukuba, Japan) reports that an image taken remotely on Feb. 19.48
with a 30-cm reflector (+ FLI IMG1024 CCD camera) near Mayhill, NM, U.S.A.,
yields position end figures 32s.11, 38".5 and the following magnitudes for
the new object: B = 10.36, V = 9.53, R_c = 9.02, I_c = 8.40. Kiyota adds
that nothing is visible at this position on Digitized Sky Survey plates.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 19 (CBET 2176) Daniel W. E. Green

[Tikhon]

19 February 2010
IAU Electronic Telegram No.2177

--------------------------------------------------------------------------------
SUPERNOVA 2010ad IN UGC 10143
--------------------------------------------------------------------------------

Further to CBET 2169, J. Rex, S. B. Cenko, W. Li, and A. V. Filippenko,
University of California, report the LOSS discovery of an apparent supernova
on unfiltered KAIT images:

SN 2010 UT R.A. (2000.0) Decl. Mag. Offset
2010ad Feb. 18.57 16 02 13.56 +15 56 18.8 16.0 5".2 E, 3".8 N

Nothing is visible at this position on a KAIT image from 2009 Sept. 9.15 UT.
J. M. Silverman, M. T. Kandrashoff, and A. V. Filippenko, University
of California, Berkeley, report that inspection of a low-signal-to-noise-
ratio CCD spectrum (range 360-990 nm), obtained on Feb. 19 UT with the 3-m
Shane reflector (+ Kast) at Lick Observatory, shows that 2010ad is a
supernova, probably of type II. Cross-correlation with a library of
supernova spectra using the "SuperNova IDentification" code of Blondin
and Tonry (2007, Ap.J. 666, 1024) indicates that 2010ad is most similar to
the spectrum of the type-IIb supernova 1993J about a week past maximum
brightness.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 19 (CBET 2177) Daniel W. E. Green

[Tikhon]

20 February 2010
IAU Electronic Telegram No.2178

--------------------------------------------------------------------------------
SUPERNOVA 2010ac IN IC 4352
--------------------------------------------------------------------------------

I. Agnoletto, Universita Degli Studi di Padova; F. Bufano and S. Benetti,
Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, report
that a spectrogram of 2010ac (cf. CBET 2174), obtained on Feb. 20.32 UT with
the European Southern Observatory's New Technology Telescope (+ EFOSC2; range
394-747 nm; resolution 1.6 nm), shows it to be a type-Ic supernova at about
25 days from maximum. Assuming a recession velocity of 5071 km/s (from
Willmer et al. 1991, A.J. 101, 57; via NED, http://nedwww.ipac.caltech.edu),
the comparison of the observed spectrum with a library of supernova spectra
via the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383, available at
website URL https://gelato.tng.iac.es/login.cgi) shows strong resemblance to
those of supernovae 1997B and 1997ei at 25 days after maximum.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 20 (CBET 2178) Daniel W. E. Green

[Tikhon]

20 February 2010
IAU Electronic Telegram No.2179

--------------------------------------------------------------------------------
NOVA OPHIUCHI 2010 No. 2
--------------------------------------------------------------------------------

H. Yamaoka, Kyushu University, forwards a report by K. Imamura and
K. Tanabe, Okayama University of Science (OSU), that a low-resolution
spectrum of the presumed nova announced on CBET 2176, obtained on Feb.
19.850 UT with the 0.28-m OUS telescope (+ DSS-7), shows a clear H_alpha
feature with P-Cyg profile, which suggests that the object is a genuine
classical nova. An absorption minimum of the H-alpha feature is about 1000
km/s, blueshifted from the emission peak. Their spectrum can be seen at
http://blog-imgs-32-origin.fc2.com/t/n/ ... 100219.png.
Yamaoka also forwards a report from M. Fujii (Kurashiki, Okayama,
Japan), who obtained a low-resolution spectrum of this object on Feb. 19.86
UT with his 0.28-m telescope. In addition to the Balmer lines with P-Cyg
profile, Fujii noticed a Fe II (37, 42, 49) emission feature, which
suggests that the variable is a "Fe II class" nova. He measured that the
blueshift of the H-alpha absorption minimum from the emission peak is
about 700 km/s, and the equivalent width of Na I D lines is about 0.4 nm.
Fujii's spectrum can be seen at the following website URL:
http://otobs.org/FBO/fko/nova/pn_oph_20100219.gif.
E. Guido and G. Sostero write that their unfiltered CCD images taken
remotely through a 0.25-m f/3.4 reflector at the GRAS Observatory near
Mayhill, NM, U.S.A., on Feb. 20.5 UT shows the new object at magnitude
about 9.4 at the following precise position: R.A. = 17h26m32s.15, Decl. =
-28d49'41".8 (equinox 2000.0; UCAC2 catalogue reference stars). Their
animation showing a comparison between their image and the archival
Digitized Sky Survey plate is posted at website URL http://bit.ly/b7JFXt.
CORRIGENDUM. On CBET 2176, second paragraph, line 3, FOR
Feb. 15.651 and 15.656 READ Feb. 19.651 and 19.656

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 20 (CBET 2179) Daniel W. E. Green

[Tikhon]

21 February 2010
IAU Electronic Telegram No.2180

--------------------------------------------------------------------------------
APPARENT NOVA IN M81: M81N 2010-01c
--------------------------------------------------------------------------------

K. Hornoch, Astronomical Institute, Ondrejov; P. Kubanek, Image
Processing Laboratory, Universidad de Valencia; N. Morales, J. L. Ortiz, J.
Gorosabel, and M. Jelinek, Instituto de Astrofisica de Andalucia, Consejo
Superior de Investigaciones Cientificas; and G. Jozsa and P. Serra,
Netherlands Foundation Research in Astronomy, of the HALOGAS (Hydrogen
Accretion in LOcal GAlaxieS) survey team, report the discovery of another
apparent nova in the galaxy M81 (cf. CBET 2170) from a co-added 6480-s R-band
CCD frame taken by Kubanek, Morales, Ortiz, Gorosabel, and Jelinek with the
1.23-m telescope at Calar Alto on Jan. 30.974 UT, and on a co-added 1200-s
narrow-band H-alpha CCD frame taken by Jozsa and Serra with the 2.5-m Isaac
Newton Telescope (+ WFC) at La Palma on Feb. 4.125. The new object,
designated M81N 2010-01c, is located at R.A. = 9h55m23s.59, Decl. =
+69o05'54".6 (equinox 2000.0), which is 51".3 west and 119".5 north of the
center of M81. M81N 2010-01c is not present on numerous archive images
from the 2.54-m Isaac Newton Telescope, the 4.2-m William Herschel
Telescope, the 4-m Mayall telescope, and the 8.2-m Subaru telescope,
down to limiting magnitudes as faint as Sloan r' = 23.3, R = 23.4,
V = 23.8, and H-alpha = 21.6. Available R, Sloan r', and H-alpha
magnitudes for nova M81N 2010-01c, measured by Hornoch: Jan. 14.394,
[22.7 (J. Prieto and R. Khan, 2.4-m Hiltner telescope + RETROCAM + Sloan
r' filter); 21.292, [23.1 (J. A. L. Aguerri, Instituto de Astrofisica de
Canarias, and R. Sanchez-Janssen, European Southern Observatory, 2.6-m
Nordic Optical Telescope + ALFOSC + Sloan r' filter); 28.961, R = 20.8
+/- 0.3 (Kubanek, Morales, Ortiz, Gorosabel, and Jelinek, 1.23-m telescope
at Calar Alto); 30.974, R = 21.0 +/- 0.2 (Kubanek, Morales, Ortiz, Gorosabel,
and Jelinek); 31.090, R = 21.3 +/- 0.3 (Kubanek, Morales, Ortiz, Gorosabel,
and Jelinek); Feb. 3.190, R = 21.9: (Kubanek, Morales, Ortiz, Gorosabel,
and Jelinek); 4.125, [H-alpha] = 20.0 +/- 0.15 (Jozsa and Serra, 2.5-m
Isaac Newton Telescope).

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 21 (CBET 2180) Daniel W. E. Green

[Tikhon]

21 February 2010
IAU Electronic Telegram No.2181

--------------------------------------------------------------------------------
APPARENT NOVA IN M31: M31N 2010-01d
--------------------------------------------------------------------------------

Further to CBETs 2061 and 2124, W. Pietsch reports the detection of an
apparent nova of mag 15.8 in ultraviolet SWIFT images taken of M31 on Jan.
15.52 UT; designated M31N 2010-01d, the new object is located at R.A. =
0h42m42s.81, Decl. = +41d16'14".7 (equinox 2000.0), which is 17" west and 5"
north of the nucleus of M31. K. Hornoch, Ondrejov Observatory, measures
position end figures 42s.79, 14".3 (offset 17".3 west, 5".8 north) for M31N
2010-01d and provides the following magnitudes from co-added R-band CCD
frames: Jan. 2.799, [19.9 (CCD frame taken during software tests by P.
Kubanek, J. Gorosabel, P. Martorell, and M. Jelinek with the 1.23-m
telescope at Calar Alto); 16.795, 16.7 +/- 0.3 (K. Hornoch, 0.65-m telescope
at Ondrejov); 30.845, 19.5: (Kubanek, N. Morales, J. L. Ortiz, Gorosabel,
and Jelinek, 1.23-m telescope at Calar Alto); 31.838, 18.9 +/- 0.3 (Kubanek,
Morales, Ortiz, Gorosabel, and Jelinek).

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 21 (CBET 2181) Daniel W. E. Green

[Tikhon]

22 February 2010
IAU Electronic Telegram No.2182

--------------------------------------------------------------------------------
SUPERNOVA 2010ab IN PGC 27294
--------------------------------------------------------------------------------

M. Fraser, S. Valenti, and S. Smartt, Queens University, Belfast; and
M. Sullivan and I. Hook, Department of Astrophysics, Oxford University,
report that a spectrum of 2010ab (cf. CBET 2172) was obtained at the William
Herschel Telescope (+ ISIS; range 320-1000nm) on Feb. 22.10 UT. The spectrum
shows a blue continuum with Balmer lines typical of a young type-II supernova.
Cross-correlation of the observed spectra with a library of supernova spectra
has been performed with the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488,
383, https://gelato.tng.iac.es/login.cgi). The spectrum gives a good match
to those of several type-II supernovae close to maximum light. A redshift of
z = 0.046 was estimated from the narrow Balmer lines of the host galaxy.
Taking the magnitude of 17.8 reported on CBET 2172, SN 2010ab has an absolute
mangitude of -18.6, which is consistent with the magnitude of bright type-II
supernovae.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 February 22 (CBET 2182) Daniel W. E. Green