IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

[Tikhon]

11 October 2010
IAU Electronic Telegram No.2491

SUPERNOVA 2010ip

Further to CBET 2484, A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J.
Graham, and R. Williams, California Institute of Technology; J. L. Prieto,
Carnegie Observatories; M. Catelan, Pontificia Universidad Catolica de Chile;
E. C. Beshore and S. M. Larson, Lunar and Planetary Laboratory, University of
Arizona; and E. Christensen, Gemini Observatory, report the CRTS discovery of
an apparent supernova in unfiltered CSS images:

SN 2010 UT R.A. (2000.0) Decl. Mag. Offset
2010ip Oct. 3.49 3 29 48.50 + 6 32 55.3 18.1 17".2 W, 10".3 S

Further CSS magnitudes for 2010ip: Sept. 16.43 UT, [19.3; Oct. 11.43, 17.6.

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superseded by text appearing later in the printed IAU Circulars.

2010 October 11 (CBET 2491) Daniel W. E. Green

[Tikhon]

12 October 2010
IAU Electronic Telegram No.2492

SUPERNOVA 2010if IN NGC 7372

J. M. Silverman and A. V. Filippenko, University of California, Berkeley,
report that inspection of a fairly noisy CCD spectrum (range 340-1000 nm),
obtained on Oct. 11 UT with the 3-m Shane reflector (+ Kast) at Lick
Observatory, shows that 2010if (CBET 2469) is likely a type-Ib supernova.

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superseded by text appearing later in the printed IAU Circulars.

2010 October 12 (CBET 2492) Daniel W. E. Green

[Tikhon]

13 October 2010
IAU Electronic Telegram No.2493

SUPERNOVA 2010iq IN IC 5145

Further to CBET 2474, A. Narla, 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
2010iq Oct. 11.16 21 54 23.25 +15 09 20.6 18.5 2".8 E, 4".4 S

The above offsets are with respect to the center of IC 5145. Additional
KAIT magnitudes for 2010iq: Sept. 28.23 UT, [19.5; Oct. 12.20, 18.2.

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superseded by text appearing later in the printed IAU Circulars.

2010 October 13 (CBET 2493) Daniel W. E. Green

[Tikhon]

13 October 2010
IAU Electronic Telegram No.2494

SUPERNOVA 2010ir IN ESO 491-12

J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, G. Folatelli, R. Cartier,
and F. Forster, Universidad de Chile; G. Pignata and M. Cifuentes, Universidad
Andres Bello; P. Gonzalez, Pontificia Universidad Catolica 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 16.6) on an unfiltered image taken on Oct. 9.35
UT with the 0.41-m 'PROMPT 4' telescope located at Cerro Tololo. The new
object, which is also present in images taken on Oct. 12.27 (at mag
approximately 16.8), is located at R.A. = 6h57m23s.79 +/- 0".1, Decl. =
-24o43'10".5 +/- 0".1 (equinox 2000), which is about 11".8 west and 26".1
north of the center of the galaxy ESO 491-12. Nothing is visible at this
position on archival images taken on Aug. 27.40 (limiting mag 18.0) and Feb.
11.17 (limiting mag 18.5).

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

2010 October 13 (CBET 2494) Daniel W. E. Green

[Tikhon]

13 October 2010
IAU Electronic Telegram No.2495

COMET 103P/HARTLEY

J. Crovisier, P. Colom, N. Biver, and D. Bockelee-Morvan, LESIA,
Observatoire de Paris, report that observations of the 18-cm lines of OH
in comet 103P/Hartley with the Nancay radio telescope show an increase in
the average OH-production rate from (0.8 +/- 0.1) x 10**28 molecules/s
during Sept. 30-Oct. 4 to (1.2 +/- 0.1) x 10**28 molecules/s during
Oct. 9-12.

Visual total-magnitude and coma-diameter estimates: Sept. 28.83 UT, 7.2,
18' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars); 29.82, 7.3, 12' (B. H.
Granslo, Orfiske, Nittedal, Norway, 7x50 binoculars); 30.80, 7.3, 25' (T.
Scarmato, Calabria, Italy, 7x50 binoculars); Oct. 1.90, 7.5, 15' (J. Warell,
Fiby Observatory, Uppsala, Sweden, 7x50 binoculars); 2.87, 6.8, 35' (Scarmato);
4.83, 5.3, 45' (Gonzalez, naked eye); 5.67, 5.9, 32' (K. Yoshimoto, Yamaguchi,
Japan, 7x35 binoculars); 6.83, 6.7, 18' (G. Pappa, Mascalucia, Italy, 12x50
binoculars); 7.87, 5.8, 35' (Scarmato); 8.32, 5.8, about 30' (C. S. Morris,
Fillmore, CA, U.S.A., 10x50 binoculars); 8.84, 6.3, 12' (A. Diepvens, Balen,
Belgium, 20x50 binoculars); 9.95, 5.7, 30' (K. Hornoch, Ondrejov, Czech Rep.,
naked eye); 10.80, 5.9, about 25' (Granslo); 11.34, 5.8, 30' (Morris).

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

2010 October 13 (CBET 2495) Daniel W. E. Green

[Tikhon]

13 October 2010
IAU Electronic Telegram No.2496

SUPERNOVA 2010ip

D. Milisavljevic and R. Fesen, Dartmouth College, report that a
low-dispersion optical spectrum (range 440-770 nm) of 2010ip (cf. CBET 2491)
was obtained with the 2.4-m Hiltner telescope (+ Mark III) at MDM Observatory
on Oct. 12.4 UT. Comparison with a library of supernova spectra using the
"Supernova Identification" tool (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) suggests a normal type-Ia event around maximum light at redshift z =
0.052.

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

2010 October 13 (CBET 2496) Daniel W. E. Green

[Tikhon]

14 October 2010
IAU Electronic Telegram No.2497

SUPERNOVA 2010is IN MCG +04-55-2

Further to CBET 2493, J. Kodros, 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
2010is Oct. 12.31 23 19 14.39 +26 03 12.2 18.3 1".1 E, 9".0 S

Additional KAIT magnitudes for 2010is: Sept. 30.25 UT, [19.4; Oct. 13.29,
18.3.

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

2010 October 14 (CBET 2497) Daniel W. E. Green

[Tikhon]

15 October 2010
IAU Electronic Telegram No.2498

SUPERNOVA 2010it IN NGC 1417

Further to CBET 2497, 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
2010it Oct. 11.51 3 41 57.50 - 4 42 21.1 17.0 2".3 E, 4".1 S

Additional KAIT magnitudes for 2010it: Oct. 6.50 UT, [18.9; Oct. 14.46, 15.9.

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

2010 October 15 (CBET 2498) Daniel W. E. Green

[Tikhon]

16 October 2010
IAU Electronic Telegram No.2499

POSSIBLE SUPERNOVA NEAR NGC 212

G. Pignata and M. Cifuentes, Universidad Andres Bello; J. Maza, M. Hamuy,
R. Antezana, L. Gonzalez, R. Cartier, and F. Forster, Universidad de Chile; P.
Gonzalez, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan
University; G. Folatelli, IPMU, University of Tokyo; 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 possible supernova (mag approximately 17.2) on an
unfiltered image taken on Oct. 7.27 UT with the 0.41-m 'PROMPT 5' telescope
located at Cerro Tololo. The new object, which is also present at mag
approximately 16.7 in an image taken on Oct. 15.3, is located at R.A. =
0h40m02s.48 +/- 0".2, Decl. = -56o09'29".9 +/- 0".2 (equinox 2000.0).
Nothing is visible at this position on archival images taken on Sept. 29.18
(limiting mag 18.5) and Sept. 16.22 (limiting mag 18.0). Several galaxies
are present in the image, which make difficult any host identification.

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

2010 October 16 (CBET 2499) Daniel W. E. Green

[Tikhon]

16 October 2010
IAU Electronic Telegram No.2500

APPARENT NOVA IN M31: M31N 2010-10c

Jiangao Ruan, Fangchenggang, Guangxi, China; and Xing Gao, Urumqi,
Xinjiang, China, report the discovery of a possible nova (mag approximately
17.8) on several 60-s unfiltered CCD survey images (limiting mag about 19.0)
taken by Xing Gao in the course of the Xingming Observatory Sky Survey around
Oct. 13.5566 UT using a Celestron C14 Schmidt-Cassegrain telescope at Mt.
Nanshan. The new object, designated M31N 2010-10c, is located at R.A. =
0h44m26s.6, Decl. = +41d31'13".4 (equinox 2000.0). Koichi Nishiyama, Kurume,
Japan; and Fujio Kabashima, Miyaki, Japan, report their independent discovery
of M31N 2010-10c at mag 17.0 on nine 40-s unfiltered CCD frames (limiting
magnitude 19.9) taken around Oct. 15.574 UT using a Meade 200R 0.40-m f/9.8
reflector (+ SBIG STL1001E camera), providing position end figures 26s.55,
13".8 (offset 1153" east and 905" north from the center of the galaxy M31).
Nishiyama and Kabashima note that a star in the HST/ACS VI data of M31
globular clusters has position end figures 26s.56, 13."8 and magnitudes V =
26.102, I = 24.499. Another independent discovery of M31N 2010-10c was made
by Koichi Itagaki (Teppo-cho, Yamagata, Japan; forwarded by S. Nakano,
Sumoto), who reported it at mag 17.4 on unfiltered CCD frames (limiting mag
19.5) taken on Oct. 16.399 using a 0.60-m f/5.7 reflector, providing position
end figures 26s.56, 13".8; he has posted an image of the new object at the
following website URL: http://www.k-itagaki.jp/images/31-pn-16.jpg.
T. Yusa, Osaki, Japan, writes that (following a request from Kabashima and
Nishiyama), he found M31N 2010-10c at mag 17.5 on Oct. 16.396 on an
unfiltered CCD exposure (limiting mag 19.0) taken with a 0.30-m f/7
Cassegrain telescope (+ SBIG STL-1001E camera), yielding position end figures
26s.54, 13".2. Yusa has posted an image of M31N 2010-10c at website URL
http://space.geocities.jp/yusastar77/PNinM31_101016.htm. Additional
magnitudes for M31N 2010-10c, unfiltered unless otherwise noted: 1986 Nov.
27, [20.8 (Digitized Sky Survey, red image; via Ruan and Gao); 1986 Nov. 27,
[18.4 (DSS, red image; via Nishiyama and Kabashima); 1993 Oct. 21, 18.1 (DSS,
infrared image; via Nishiyama and Kabashima); 2010 Sept. 25.576, [19.5
(Itagaki); Oct. 9.600, [19.7 (Nishiyama and Kabashima); 10.635, [19.9
(Nishiyama and Kabashima); 11.555, [19.0 (Ruan and Gao); 12.6254, [19.0 (Ruan
and Gao); 13.515, [20.5 (Itagaki); 13.596, 17.5 (Ruan and Gao); 14.583, V =
17.0 (Ruan and Gao); 16.626, 17.6 (Nishiyama and Kabashima).

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

2010 October 16 (CBET 2500) Daniel W. E. Green

[Tikhon]

17 October 2010
IAU Electronic Telegram No.2501

SUPERNOVA 2010ir IN ESO 491-12

J. L. Prieto, Carnegie Observatories, reports that an optical spectrum
(range 370-930 nm; resolution 0.7nm) of 2010ir (cf. CBET 2494) was obtained
with the APO 3.5-m telescope (+ DIS) on Oct. 14.4 UT. The spectrum shows
broad He I and Balmer lines in absorption. After cross-correlation with a
library of supernova spectra using SNID (Blondin and Tonry 2007, Ap.J. 666,
1024), 2010ir is found to be most similar to the type-IIb supernova 2000H at
13 days after maximum.

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

2010 October 17 (CBET 2501) Daniel W. E. Green

[Tikhon]

17 October 2010
IAU Electronic Telegram No.2502

SUPERNOVA 2010it IN NGC 1417

G. H. Marion, Harvard-Smithsonian Center for Astrophysics and University
of Texas; J. Vinko, University of Szeged; and J. C. Wheeler, University of
Texas, report that a spectrum (range 430-1000 nm) of 2010it (cf. CBET 2498)
was obtained by J. Caldwell on Oct. 15 UT with the 9.2-m Hobby-Eberly
Telescope (+ Marcario Low-Resolution Spectrograph). Cross-correlation with a
library of supernova spectra using the "Supernova Identification" code (SNID;
Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2010it is a type-Ia
supernova a few days before maximum brightness. The velocity of the Si II
635.5-nm feature is measured to be 10400 km/s.

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

2010 October 17 (CBET 2502) Daniel W. E. Green

[Tikhon]

17 October 2010
IAU Electronic Telegram No.2503

SUPERNOVAE 2010iu AND 2010iv

J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, and F. Forster,
Universidad de Chile; G. Pignata and M. Cifuentes, Universidad Andres Bello; P.
Gonzalez, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan
University; G. Folatelli, Institute for the Physics and Mathematics of the
Universe (IPMU), University of Tokyo; 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 17.4) on unfiltered images taken
on Oct. 15.26 and 16.09 UT with the 0.41-m 'PROMPT 1' telescope located at
Cerro Tololo. The object, designated SN 2010iv, is located at R.A. =
4h03m52s.23 +/- 0".2, Decl. = -43o25'38".5 +/- 0".2 (equinox 2000.0); it is
right on the top of the small galaxy and completely dominating the visible
light. Nothing is visible at this position on a stack of seventeen 40-s
archival images taken between 2009 Nov. 5.13 and 2010 Aug. 13.28 (limiting
mag 19.5).

G. Pignata, Universidad Andres Bello; and G. Folatelli, IPMU, University
of Tokyo, on behalf of the Millennium Center for Supernova Science, report on
optical spectroscopy (range 355-890 nm) of 2010iv (see above) and the object
announced on CBET 2499 (and now designated 2010iu), obtained with the SOAR
4.3-m telescope (+ Goodman HTS) on Oct. 16.3 UT. The spectra show both
objects to be normal type-Ia supernovae, a few days before maximum.
Following cross-correlation with a library of supernova spectra using SNID
(Blondin and Tonry 2007, Ap.J. 666, 1024), 2010iv is found to be most similar
to SN 2003du at three days before maximum; SNID also provides a best-fit
redshift of 0.074 for 2010iv. SN 2010iu is most similar to SN 1992A at five
days before maximum (via SNID). The Si II 597.2-nm line appears stronger in
SN 2010iu than in SN 1992A. SNID also provides a best-fit redshift of 0.040
for SN 2010iu.

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

2010 October 17 (CBET 2503) Daniel W. E. Green

[Tikhon]

17 October 2010
IAU Electronic Telegram No.2504

POSSIBLE SUPERNOVA IN PGC 134795

Ivica Pletikosa and Filip Novoselnik, on behalf of the "La Sagra Sky
Survey" (LSSS) supernova search team (which includes also Denis Vida, Ivica
Skokic, David Gostinski, Robert Gregic, Salvador Sanchez, Jaime Nomen, Reiner
Stoss, Bill Yeung, Juan Rodriguez, and Miguel Hurtado), report the discovery
of an apparent supernova (magnitude 17.3) on three CCD images (limiting mag
about 20.0) taken on Oct. 13.909, 13.923, and 13.936 UT with a 0.45-m
telescope. The new object is located at R.A. = 1h55m18s.37, Decl. =
-17d46'46".3 (equinox 2000.0), which is 8".6 west and 6".2 south of the
nucleus of the presumed host galaxy, PGC 134795. Additional approximate
magnitudes for the suspernova suspect, from unfiltered images unless
otherwise noted: 1996 Dec. 4.467, [22 (Digitized Sky Survey, red plate);
2010 Oct. 16.946, 17.9 (LSSS). The LSSS image from Oct. 13 has been posted
(with the red DSS image on the right) at the following website URL:
http://img833.imageshack.us/img833/9923/pgc134795.png. Joseph Brimacombe,
Cairns, Australia, finds the new object at mag 18.2 (red mag 17.9 measured
by Vida from the same image) and position end figures 18s.29, 46".5 on a
stacked CCD exposure taken on Oct. 17.436 remotely using a 51-cm RCOS
telescope at the New Mexico Skies Observatory; Brimacombe's image is
posted at website URL http://www.flickr.com/photos/43846774@N02/5089347910/.

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

2010 October 17 (CBET 2504) Daniel W. E. Green

[Tikhon]

18 October 2010
IAU Electronic Telegram No.2505

SUPERNOVA 2010iw NEAR UGC 4570

Stanley C. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G.
Djorgovski, A. Mahabal, M. J. Graham, and R. Williams, California Institute
of Technology; J. L. Prieto, Carnegie Observatories; M. Catelan, Pontificia
Universidad Catolica de Chile; E. C. Beshore and S. M. Larson, Lunar and
Planetary Laboratory, University of Arizona; and E. Christensen, Gemini
Observatory, report the discovery by Howerton of an apparent supernova in
public Catalina Sky Survey (CSS) images:

SN 2010 UT R.A. (2000.0) Decl. Mag. Offset
2010iw Oct. 14.66 8 45 15.01 +27 49 21.8 16.4 12".9 W, 3".4 S

Further magnitudes for 2010iw: June 11.16 UT, [19.0 (CSS); Oct. 17.50,
16.3 (Howerton, remotely with a 0.6-m LB-1 telescope, Rodeo, NM, U.S.A.).
They note that the new object lies 5".4 east and 1".1 north from a galaxy
seen in Sloan Digital Sky Survey images with measured redshift z = 0.109;
the current luminosity of 2010iw appears too high for it to be a regular
supernova associated with this distant galaxy. The host galaxy is thus is
likely to be UGC 4570 (at redshift z = 0.0215).

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

2010 October 18 (CBET 2505) Daniel W. E. Green

[Tikhon]

18 October 2010
IAU Electronic Telegram No.2506

SUPERNOVA 2010ix IN PGC 3583

Denis Vida and Filip Novoselnik, on behalf of the "La Sagra Sky Survey"
(LSSS) supernova search team (which includes also Ivica Skokic, Robert Gregic,
David Gostinski, Salvador Sanchez, Jaime Nomen, Reiner Stoss, Bill Yeung, Juan
Rodriguez and Miguel Hurtado), report the discovery of an apparent supernova
(magnitude 18.0) on two CCD images (limiting mag about 20.0) taken on Oct.
16.825 and 16.839 UT with a 0.45-m telescope. The new object is located at
R.A. = 1h00m02s.49, Decl = +41d42'57".6 (equinox 2000.0), which is 13".7 west
and 4".4 south of the nucleus of the presumed host galaxy, PGC 3583.
Additional approximate magnitudes for 2010ix, from unfiltered images unless
otherwise noted: 1986 Nov. 27.186 UT, [22 (Digitized Sky Survey, red plate);
2010 Oct. 17.871, 18.2 (LSSS). The LSSS image from Oct. 16 has been posted
(with the red DSS image on the right) at the following website URL:
http://img138.imageshack.us/img138/2623/pgc003583.png. The LSSS image from
Oct. 17 is posted at http://img4.imageshack.us/img4/2623/pgc003583.png.

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

2010 October 18 (CBET 2506) Daniel W. E. Green

[Tikhon]

19 October 2010
IAU Electronic Telegram No.2507

ORIONID METEORS 2010

P. Jenniskens, SETI Institute, reports that the strong Orionid meteor
shower activity of 2006-2009 may repeat this year, for a final year in this
sequence, according to M. Sato and J.-I. Watanabe (2007, PASJ 59, L21);
they ascribed the 2006-2009 activity to dust trails of comet 1P/Halley that
were formed by meteoroids ejected in the years 1401 BC and 12 BC. The
orbital evolution of the dust is affected by the 1:5 to 1:8 mean-motion
resonances with Jupiter. This so-called "filament" component is expected
to be in the earth's path again around Oct. 20-25 in 2010, giving rise to
a higher-than-normal Orionid-shower activity that is relatively rich in
bright meteors. Sato expects a peak ZHR of 40-50 /h, at the same level
as in 2009. As case studies, Sato calculated peak times of Oct. 21 9h UT
for the 1266 BC dust trail and Oct. 25 4h UT for the 911 BC trail, both
having dust survive in the 1:6 resonance with Jupiter.

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

2010 October 19 (CBET 2507) Michael Rudenko

[Tikhon]

19 October 2010
IAU Electronic Telegram No.2508

SUPERNOVA 2010iy IN ESO 281-14

J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, and F. Forster,
Universidad de Chile; G. Pignata and M. Cifuentes, Universidad Andres Bello;
P. Gonzalez, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan
University; G. Folatelli, IPMU, University of Tokyo; 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 17.7) on an
unfiltered image taken on Oct. 18.04 UT with the 0.41-m 'PROMPT 5' telescope
located at Cerro Tololo. The new object, which is also present at mag
approximately 16.7 in an image taken on Oct. 19.00, is located at R.A. =
18h36m36s.91 +/- 0".2, Decl. = -47o03'15".7 +/- 0".2 (equinox 2000.0), which
is about 3".1 west and 0".5 south of center of the galaxy ESO 281-14.
Nothing is visible at this position on archival images taken on Sept. 22.09
(limiting mag 18.0) and Sept. 9.14 (limiting mag 18.5).

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

2010 October 19 (CBET 2508) Michael Rudenko

[Tikhon]

19 October 2010
IAU Electronic Telegram No.2509

COMET 238P/READ

H. H. Hsieh, University of Hawaii, reports that observations of 238P/Read
on October 5 UT using the 10-m Keck I telescope on Mauna Kea show that
it has once again become active after last being observed to be active in
December 2005. In a composite image comprising 1140 s of effective
exposure time, the comet exhibits a short, tapered tail approximately 5" in
length pointed in the anti-solar direction (about 75 deg east of north) and a
small amount of coma (comet FWHM = 0".90, measured perpendicular to the
tail, compared to typical stellar FWHMs of 0".85). The total R-band magnitude
(measured inside a 2".0 aperture) was 22.25 +/- 0.05. This comet is notable
for being the second main-belt comet (MBC; Hsieh and Jewitt, 2006, Science
312, 561) to have been discovered, after 133P/Elst-Pizarro. It is now also
the second MBC after 133P to be confirmed to have recurrent activity, a key
indication that sublimation, perhaps modulated by seasonal effects, of
volatile ice (and not a one-time event such as an impact) is responsible for
the observed activity.

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

2010 October 19 (CBET 2509) Michael Rudenko

[Tikhon]

20 October 2010
IAU Electronic Telegram No.2510

SUPERNOVA 2010iz IN UGC 3552

Further to CBET 2498, J. K. Kodros, W. Li, S. B. Cenko, and A. V.
Filippenko report the LOSS discovery of an apparent supernova on unfiltered
KAIT images:

SN 2010 UT R.A. (2000.0) Decl. Mag. Offset
2010iz Oct. 16.55 6 49 50.94 +28 22 22.1 17.2 5".2 E, 5".9 N

Nothing was visible at this position on a KAIT image from Mar. 22.18 UT
(limiting mag 19.0). Following posting on the Central Bureau's unconfirmed-
objects webpage, Markku Nissinen and Veli-Pekka Hentunen, Varkaus, Finland,
write that they remotely used a 43-cm f/6.8 Global-Rent-a-Scope (GRAS) located
near Nerpio, Spain, to obtain images (limiting mag 21.0) of 2010iz to derive
position end figures 50s.93, 21".8 and magnitude V = 16.8 on Oct. 20.126.

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

2010 October 20 (CBET 2510) Daniel W. E. Green