IAU Circulars (IAUCs) - циркуляры МАС - 06/2010

[Tikhon]

27 June 2010
IAU Electronic Telegram No.2339

SUPERNOVAE 2010en, 2010eo, 2010ep, 2010eq, 2010er, 2010es, AND 2010et

Further to CBET 2327, A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J.
Grahamm 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
several apparent supernovae in unfiltered Catalina Sky Survey (CSS) images:

SN 2010 UT R.A. (2000.0) Decl. Mag. Offset
2010en May 13.42 15 50 16.02 + 4 43 34.0 19.0 3".8 W, 3".1 S
2010eo May 21.28 13 50 45.79 +19 26 18.2 17.6 0".1 W, 1".2 N
2010ep May 25.37 16 01 08.91 +34 50 41.6 18.1 5".8 W, 5".1 N
2010eq May 31.31 15 34 47.41 + 2 05 49.7 17.6 2".4 W, 1".0 N
2010er June 9.33 15 50 11.14 +12 16 42.5 17.8 6".0 E, 0".3 S
2010es June 16.32 16 33 17.92 +11 45 04.9 18.8 0".9 E, 1".3 S
2010et June 16.40 17 16 54.08 +31 33 50.6 19.1 24".2 E, 70".3 S

Follow-up observations were taken with the Palomar 1.5-m telescope using Gunn
filters. Further magnitude estimates for 2010en: Apr. 9.43 UT, [20.0 (CSS);
May 27.36, r = 19.0 (Palomar); June 9.30, 19.5 (CSS); 16.28, 19.2 (CSS).
Further magnitude estimates for 2010eo: May 7.31, [18.4 (CSS); May 30.28, g
= 17.7, r = 17.5, i = 17.6 (Palomar); June 23.24, 17.9 (CSS). Further CSS
magnitude estimates for 2010ep: May 12.42, [20.0; June 18.34, 19.0. Further
magnitude CSS estimates for 2010eq: May 4.45, [19.0; June 9.24, 17.9; 17.25,
18.1. Further magnitude estimates for 2010er: May 16.39, [19.5 (CSS); May
23.25, 19.5: (CSS); June 2.32, 17.9 (CSS); June 15.42, g = 18.4, r = 18.4,
i = 18.8 (Palomar); June 17.28, 18.1 (CSS); June 21.25, 18.3 (CSS). Further
magnitude estimates for 2010es: June 2.36, [20.2 (CSS); June 9.34, 19.2
(CSS); June 21.20, 18.6 (CSS); June 24.39, g = 18.8, r = 18.9, i = 19.1
(Palomar). Further CSS magnitude estimates for 2010et: May 23.37, [20.2;
June 3.37, 19.6; 9.39, 19.0; 21.32, 19.4.

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superseded by text appearing later in the printed IAU Circulars.

2010 June 27 (CBET 2339) Daniel W. E. Green

[Tikhon]

27 June 2010
IAU Electronic Telegram No.2340

SUPERNOVA 2010eu

Denis Vida, Valpovo, Croatia, reports the discovery by the La Sagra Sky
Survey (LSSS) supernova search team (Filip Novoselnik, Denis Vida, Ivica
Skokic, Robert Gregic, David Gostinski, Salvador Sanchez, Jaime Nomen, Reiner
Stoss, Bill Yeung, Juan Rodriguez, and Miguel Hurtado) of an apparent
supernova (mag 18.7) on three CCD images (limiting magnitude about 20.0)
taken on June 20.112, 20.125, and 20.138 UT with a 45-cm telescope in the
course of the LSSS. The new object is located at R.A. = 21h31m36s.16, Decl.
= +12d28'51".1 (equinox 2000.0), which is 7".4 south and 5".8 east of the
nucleus of the apparent host galaxy (which has position end figures 35s.8,
58".5). Nothing is visible at this position on a Digitized Sky Survey image
from 1987 Sept. 26 (limiting red mag 22) or on a Sloan Digital Sky Survey
image from 2000 Sept. 27 (limiting infrared mag 22.3). R. Stoss writes
that 96 stacked 90-s CCD images taken with the 40-cm f/10 reflector at the
Observatorio de La Sagra in bright moonlight on June 27.07 yields mag 18.8
and position end figures 36s.17, 50".5 for 2010eu.

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

2010 June 27 (CBET 2340) Daniel W. E. Green

[Tikhon]

28 June 2010
IAU Electronic Telegram No.2341

APPARENT NOVAE IN M31: M31N 2010-05a AND M31N 2010-06a

Kamil Hornoch, Ondrejov Observatory, reports the discovery of an apparent
nova in the galaxy M31 by P. Hornochova and himself on a co-added 1620-s
R-band CCD frame taken with the 0.65-m telescope at Ondrejov on June 28.014 UT.
The new object, designated M31N 2010-06a, is well visible on single images
used for the co-added image, as well as on a pre-discovery, co-added, 3780-s
R-band image taken by Hornoch on June 27.034 and on a co-added 2430-s R-band
image taken on June 28.040 with the same instrumentation, but it is not
present on numerous archive images taken at Lelekovice and Ondrejov. M31N
2010-06a is located at R.A. = 0h43m07s.52, Decl. = +41o19'48".7 (equinox
2000.0), which is 261" east and 220" north of the center of M31. Available
R-band magnitudes for M31N 2010-06a: June 18.152, [21.4 (P. Kubanek, J.
Gorosabel, O. L. Gil, and M. Jelinek, 1.23-m telescope at Calar Alto);
23.038, [19.5 (K. Hornoch, 0.65-m telescope at Ondrejov); 25.995, [18.9
(Hornoch and Hornochova, 0.65-m telescope at Ondrejov); 27.034, 19.3 +/- 0.2
(Hornoch); 28.014, 18.1 +/- 0.1 (Hornoch and Hornochova); 28.040, 18.2 +/- 0.1
(Hornoch and Hornochova).
Hornoch also reports additional R-band photometry of M31N 2010-05a (cf.
CBETs 2305 and 2319), as measured by himself from a variety of images: June
10.041 UT, 17.3 +/- 0.1 (P. Zasche, 0.65-m telescope at Ondrejov); 11.037,
17.1 +/- 0.15 (K. Hornoch, M. Wolf, and P. Hornochova, 0.65-m telescope at
Ondrejov); 11.050, 17.3 +/- 0.15 (Hornoch, Wolf, and Hornochova); 16.016, 17.2
+/- 0.15 (Hornoch, 0.65-m telescope at Ondrejov); 16.051, 17.1 +/- 0.15
(Hornoch); 18.152, 17.82 +/- 0.08 (P. Kubanek, J. Gorosabel, O. L. Gil, and M.
Jelinek, 1.23-m telescope at Calar Alto); 23.038, 17.9 +/- 0.15 (Hornoch);
23.060, 17.7 +/- 0.2 (Hornoch); 25.995, 18.1 +/- 0.15 (Hornoch and Hornochova,
0.65-m telescope at Ondrejov).

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

2010 June 28 (CBET 2341) Daniel W. E. Green

[Tikhon]

28 June 2010
IAU Electronic Telegram No.2342

APPARENT NOVA IN M31: M31N 2010-06b

Kamil Hornoch, Ondrejov Observatory, reports the discovery by P.
Hornochova and himself of another apparent nova in M31 from a co-added 1620-s
R-band CCD frame taken with the 0.65-m telescope at Ondrejov on June 28.014 UT.
The new object is located at R.A. = 0h44m22s.46, Decl. = +41o28'14".5 (equinox
2000.0), which is 1105" east and 726" north of the center of the galaxy M31.
M31N 2010-06b is visible on single images used for the co-added image, as well
as on a pre-discovery co-added 630-s R-band image taken by Hornoch on June
26.997 with the same instrumentation, but the presumed nova is not present on
available archive images. Also, the object is not present down to magnitude
R = 23 on a deep R-band image obtained in the course of data collecting for
the Local Group Survey M31 catalogue (Massey et al. 2006, A.J. 131, 2478).
Available R-band magnitudes for M31N 2010-06b: 2006 Jan. 6.084 UT, [21.4
(J. Gallagher and P. Garnavich, 0.91-m telescope at Kitt Peak); 25.086, [21.6
(Gallagher and Garnavich); 2010 June 26.997, 19.0 +/- 0.3 (K. Hornoch, 0.65-m
telescope at Ondrejov); 28.014, 19.1 +/- 0.15 (Hornoch and P. Hornochova,
0.65-m telescope at Ondrejov).

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

2010 June 28 (CBET 2342) Daniel W. E. Green

[Tikhon]

29 June 2010
IAU Electronic Telegram No.2343

APPARENT NOVA IN M31: M31N 2010-06c

V. Burwitz, Max-Planck-Institut fuer Extraterrestrische Physik (MPE);
Observatorio Astronomico de Mallorca (OAM); W. Pietsch and M. Henze, MPE;
J. Rodriguez, OAM; and C. A. Haswell, S. Holmes, U. Kolb, and R. Lucas, The
Open University (TOU), report the discovery of an apparent nova (R magnitude
17.8) in M31 on a stack of five 120-s unfiltered CCD images obtained with the
0.35-m f/11 TOU/OAM "PIRATE" Schmidt-Cassegrain telescope (+ SBIG STL-1001E
CCD camera) at Costitx, Mallorca, on June 26.084 UT. The new object,
designated M31N 2010-06c, is located at R.A. = 0h44m04s.48, Decl. =
+41d28'34".2 (equinox 2000.0; uncertainty 0".3), which is 902" east and 746"
north of the core of M31. No object is visible at this position on a PIRATE
image taken on June 17.093 (limiting R mag 19.0). M31N 2010-06c is clearly
detected in the individual images. All measured magnitudes are from a
photometric solution using R magnitudes of the Local Group Survey M31
catalogue of Massey et al. (2006, A.J. 131, 2478).
Pietsch, Henze, and Burwitz -- together with A. Liakos (Department of
Physics, University of Athens), D. Hatzidimitriou (Department of Physics,
University of Crete), and P. Niarchos (Department of Physics, University of
Athens) -- add that confirmation of M31N 2010-06c at mag 18.0 was obtained
with a stack of ten 60-s unfiltered CCD images obtained with a 40-cm
Cassegrain telescope (+ f/5.1 focal reducer + 2184x1472-pixel ST-10XME CCD
camera; pixel size 6.8 microns square) at the Athens University Observatory
on June 27.028 UT; they provide position end figures 04s.48, 33".8.
K. Hornoch provides magnitude R = 17.6 +/- 0.15 and position end figures
04s.47, 34".2 (offset 902" east, 746" north of the center of M31) for M31N
2010-06c, as measured from a co-added 630-s R-band CCD frame taken by himself
with the 0.65-m telescope at Ondrejov on June 26.997 UT.

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

2010 June 29 (CBET 2343) Daniel W. E. Green

[Tikhon]

30 June 2010
IAU Electronic Telegram No.2344

SUPERNOVA 2010ev IN NGC 3244

G. Pignata, M. Cifuentes, Universidad Andres Bello; J. Maza, M. Hamuy, R.
Antezana, L. Gonzalez, P. Gonzalez, S. Silva, G. Folatelli, R. Cartier, F.
Forster, and S. Marchi, 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 their discovery of an apparent supernova (mag
approximately 14.3 +/- 0.2) on an unfiltered image taken on June 27.05 UT
with the 0.41-m 'PROMPT 1' telescope located at Cerro Tololo. The new object,
which was confirmed at mag approximately 13.7 in an unfiltered image taken
with the 'PROMPT 3' telescope on June 29.99, is located at R.A. = 10h25m28s.99
+/- 0".1, Decl. = -39o49'51".2 +/- 0".1 (equinox 2000.0), which is about 1".6
east and 12".4 south of center of the galaxy NGC 3244. Nothing is visible at
this position on archival images taken on May 1.01 (limiting mag 18.5) and
Apr. 28.02 (limiting mag 18.0).
Prior to the confirming image by CHASE (above), 2010ev was posted on
the Central Bureau's unconfirmed-objects webpage. Several hours after that
posting, C. Jacques (Belo Horizonte, Brazil) reported the independent
discovery of 2010ev in the course of the Brazilian Supernovae Search (by C.
Colesanti, E. Pimentel, T. Napoleao, and himself), noting mag 15.0 and
position end figures 29s.06, 50".7 (offset 5".4 east, 10".5 south) on their
unfiltered CCD image (limiting magnitude 18.0) taken with a 0.30-m Schmidt-
Cassegrain f/3 reflector at the CEAMIG-REA Observatory on June 28.89 UT,
adding that nothing is visible at this position on a CCD image taken on
2005 Jan. 15.12 (limiting magnitude 18.5) or on a Palomar Sky Survey plate
from 1984 Feb. 3 (limiting red mag 19.5).
Also, Greg Bock (Windaroo, Queensland, Australia) reports that
Stuart Parker (Oxford, Canterbury, New Zealand) obtained a 25-s unfiltered
CCD image (limiting red mag 18.2) with a 35-cm Celestron C14 f/6.3 reflector
(+ ST10 CCD camera) on June 27.05 UT, showing 2010ev at red mag 14.8 and
position end figures 28s.94, 51".9 (offset 1".9 east, 11".4 south), as
measured by Bock.

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

2010 June 30 (CBET 2344) Daniel W. E. Green

[Tikhon]

4 June 2010
IAU Circular No.9150

COMET P/2010 K2 (WISE)

An object reported by the WISE spacecraft without description
(discovery observation tabulated below), and posted on the Minor
Planet Center's 'NEOCP' webpage, has been found by ground-based
astrometrists to show cometary appearance. J. V. Scotti, Lunar and
Planetary Laboratory, reports that CCD images taken with the
Spacewatch 1.8-m f/2.7 reflector on June 3.15 UT show the object to
be diffuse with a coma of mag 20.2-20.4 and diameter 7", and a tail
0'.25 long in p.a. 110 deg; images with the same telescope on June
4.2 show a 5" coma of mag 20.2-20.4 and a 0'.25 tail in p.a. 113
deg. Images taken by A. C. Gilmore and P. M. Kilmartin with the
Mount John 1.0-m f/7.7 reflector on June 4.3 show a head of stellar
appearance with a possible 9" tail in p.a. 110 deg on two 200-s CCD
exposures. A. Mainzer, Jet Propulsion Laboratory, has subsequently
reported that this object is almost as bright as C/2010 J4 (which
was around mag 19 at discovery; cf. IAUC 9147) in 12-micron W3
images, noting that a coma extends about 20" in diameter, with a
tail that extends approximately 20" in p.a. about 43 deg; the
comet was detected in a couple of dozen 12- and 22-micron WISE
images.

2010 UT R.A. (2000) Decl. Observer
May 27.18060 10 21 26.29 - 8 53 39.6 WISE

The available astrometry, the following elliptical orbital elements,
and an ephemeris appear on MPEC 2010-L17.

T = 2010 July 7.525 TT Peri. = 328.473
e = 0.59234 Node = 281.068 2000.0
q = 1.19949 AU Incl. = 10.664
a = 2.94236 AU n = 0.195281 P = 5.05 years


COMET 236P/LINEAR

Comet P/2010 K1 = P/2003 UY_275 (cf. IAUC 9149) has been
assigned the permanent designation 236P (cf. MPC 70139).


COMET C/2009 R1 (McNAUGHT)

Visual total-magnitude and coma-diameter estimates: May 14.79
UT, 8.6, 4' (D. A. J. Seargent, Cowra, NSW, Australia, 25x100
binoculars); 17.14, 7.8, 8' (J. J. Gonzalez, Leon, Spain, 10x50
binoculars); 25.46, 7.3, 5' (C. W. Hergenrother, Tucson, AZ, U.S.A.,
10x50 binoculars); June 1.07, 6.5, 5' (S. Baroni, Milan, Italy,
20x80 binoculars); 4.00, 6.3, 2' (U. Pilz, Leipzig, Germany, 20x80
binoculars).

2010 June 4 (9150) Daniel W. E. Green

[Tikhon]

8 June 2010
IAU Circular No.9151

COMET P/2010 L1 (WISE)

A. Mainzer, Jet Propulsion Laboratory, reports the discovery
of a comet on 12- and 22-micron images taken by the WISE spacecraft
(discovery observation tabulated below), noting the object to have
a coma diameter of about 20", a tail > 100" in p.a. 180 deg, and a
brightness at 12 microns that is about ten times fainter than
P/2010 K2 (cf. IAUC 9150). After posting on the 'NEOCP' webpage,
ground-based CCD astrometrists have also noted the object's
cometary appearance. J. V. Scotti reports that CCD images taken in
growing twilight with the Spacewatch 1.8-m f/2.7 reflector on June
6.5 UT show the object to be of mag 21.6 and perhaps slightly
diffuse. Subsequent CCD images taken on poor (3") seeing on June
8.4 with the Steward Observatory's Bok 2.3-m f/3 reflector by
Scotti, J. A. Larsen, R. S. McMillan, and G. Bechetti show the
object to be diffuse compared to neighboring stars. R. Miles
writes that CCD images taken on June 7.60 with the 2.0-m f/10
"Faulkes Telescope North" at Haleakala show an asymmetric coma with
a total R-band magnitude of 20.2 (15"-diameter aperture) and a 10"
tail in p.a. 240 +/- 20 deg.

2010 UT R.A. (2000) Decl. Observer
June 2.50126 22 58 39.88 - 7 03 14.4 WISE

The available astrometry, the following elliptical orbital elements,
and an ephemeris appear on MPEC 2010-L46.

T = 2010 Feb. 4.039 TT Peri. = 316.248
e = 0.46056 Node = 318.501 2000.0
q = 2.13749 AU Incl. = 21.099
a = 3.96242 AU n = 0.124958 P = 7.9 years


COMET C/2010 E6 (STEREO)

Further to IAUC 9117, a Kreutz sungrazing comet found on
STEREO HI-1A website images was subsequently seen in STEREO-A and
STEREO-B COR2 and in SOHO C3 and C2 images -- yielding astrometry
for Mar. 8-12. K. Battams notes that C/2010 E6 showed the first
definite ion tail seen in a Kreutz sungrazer in SOHO or STEREO
spacecraft images. Astrometric measurements were done by H.
Dennison and Battams, with astrometric reductions and orbital
calculations done by B. G. Marsden.

Comet 2010 UT R.A.(2000)Decl. Inst. F MPEC
C/2010 E6 Mar. 8.183 3 57.3 +11 48 HI-1 AW 2010-L19

2010 June 8 (9151) Daniel W. E. Green

[Tikhon]

15 June 2010
IAU Circular No.9152

COMET P/2010 L2 = 2002 LN_13 (LINEAR)

A. Mainzer, Jet Propulsion Laboratory, reports the finding of
a comet on 12- and 22-micron images taken by the WISE spacecraft
(discovery astrometry tabulated below), which the WISE team quickly
identified to be 2002 LN_13, an apparently asteroidal object
discovered by the LINEAR project (2002 discovery observation also
tabulated below from MPS 57859) whose orbit was good enough to
place the object within about 15" of the current position. Mainzer
notes that 2002 LN_13 is similar in brightness at 12 microns to
that of comet 233P/2009 WJ_50 on 2010 Feb. 6 (cf. IAUC 9117), when
that comet's optical total magnitude was around 20-22; she adds
that 2002 LN_13 is fainter but clearly detected at 22 microns. The
nuclear condensation is very small in the WISE images, about 9" in
diameter, but the tail extends about 100" toward the west-southwest.
Following a request to observe this object by the WISE team, R. S.
McMillan (University of Arizona) reports that CCD images taken with
the Spacewatch 1.8-m f/2.7 reflector (bandpass 500-900 nm) in good
seeing on June 15.4 UT show negligible coma, a nuclear condensation
that is no more than 1" wider than star images (with total mag
20.0-20.6), and a tail at least 1'.5 long and 6 deg wide toward p.a.
246 deg.

2002 UT R.A. (2000) Decl. Mag. Observer
June 6.23078 15 37 06.70 -23 14 31.9 18.7 LINEAR

2010 UT R.A. (2000) Decl. Observer
June 10.56835 22 53 07.10 +11 08 58.1 WISE

The new astrometry and the following elliptical orbital elements by
B. G. Marsden linking the two apparitions, together with residuals
and an ephemeris, appear on MPEC 2010-L93.

Epoch = 2002 Sept. 3.0 TT
T = 2002 Sept.10.7540 TT Peri. = 20.4622
e = 0.351584 Node = 252.4941 2000.0
q = 2.424945 AU Incl. = 16.1444
a = 3.739801 AU n = 0.1362798 P = 7.23 years

Epoch = 2009 Nov. 25.0 TT
T = 2009 Dec. 2.7231 TT Peri. = 20.6322
e = 0.352754 Node = 252.4353 2000.0
q = 2.415741 AU Incl. = 16.1539
a = 3.732338 AU n = 0.1366887 P = 7.21 years

2010 June 15 (9152) Daniel W. E. Green

[Tikhon]

16 June 2010
IAU Circular No.9153

COMET C/2010 L3 (CATALINA)

An apparently asteroidal object discovered by the Catalina Sky
Survey (discovery observation tabulated below), and posted on the
Minor Planet Center's 'NEOCP' webpage, has been found by other CCD
astrometrists to show cometary appearance. R-band images taken by
W. H. Ryan with the Magdalena Ridge Observatory 2.4-m f/8.9
reflector on June 15.4 and 16.3 UT show the object to be diffuse
with a distinct coma (mag 19.2-19.4) and a tail in p.a. about 80
deg. P. Birtwhistle (Great Shefford, Berkshire, England, 0.40-m
f/6 Schmidt-Cassegrain reflector; June 16.0) notes that the object
appears to be slightly more diffuse than nearby stars of similar
brightness, with a diameter of about 6" and no tail. S. Foglia
writes that forty stacked 60-s exposures taken by R. Holmes
(Ashmore, IL, U.S.A., 0.61-m astrograph; June 16.3) show a round
coma of diameter 6". E. Guido, Castellammare di Stabia, Italy,
reports that 25 stacked 120-s images taken by G. Sostero and
himself remotely with a 0.25-m f/3.4 reflector located near Mayhill,
NM, U.S.A., on June 16.3 show a coma that is about 12" in diameter.
D. Balam reports that images obtained on June 16.34 with the 1.82-m
Plaskett telescope of the Dominion Astrophysical Observatory
(National Research Council of Canada) show that the object has a
coma of diameter 6". H. Sato (Ota-ku, Tokyo, Japan) writes that
his images, taken remotely with a 0.25-m f/3.4 reflector at the RAS
Observatory near Mayhill on June 16.4, show a condensed coma of
diameter 8" and total mag 19.0.

2010 UT R.A. (2000) Decl. Mag. Observer
June 15.30348 16 50 44.30 +45 30 34.5 19.6 Catalina

The available astrometry, the following preliminary parabolic
orbital elements by B. G. Marsden, and an ephemeris appear on MPEC
2010-M09.

T = 2011 July 10.279 TT Peri. = 189.154
Node = 140.824 2000.0
q = 2.33597 AU Incl. = 57.354


COMET C/1997 S6 (SOHO)

Further to IAUC 9138, another Kreutz sungrazer (stellar in
appearance with peak magnitude about 7.5) has been found on SOHO C3
website images.

Comet 1997 UT R.A.(2000)Decl. Inst. F MPEC
C/1997 S6 Sept. 20.490 11 32.7 + 0 02 C3 JR 2010-L60

2010 June 16 (9153) Daniel W. E. Green

[Tikhon]

18 June 2010
IAU Circular No.9154

COMET C/2010 L4 (WISE)

A. Mainzer, Jet Propulsion Laboratory, reports the discovery
of a comet on 12- and 22-micron images taken by the WISE spacecraft
(discovery observation tabulated below), noting the object to have
a "hazy" coma of diameter about 15", with a fan-shaped tail
extending about 30" toward the west; she adds that this comet is
approximately as bright as comet P/2010 D1 was when WISE first
observed that object (cf. IAUC 9118), which was around mag 21
optically. After posting on the 'NEOCP' webpage, ground-based CCD
astrometrists have also noted the object's cometary appearance.
W. H. Ryan (Magdalena Ridge Observatory, 2.4-m reflector) reports
that R-band images taken on June 18.25-18.30 UT show a distinct
coma of mag 18.9-19.5. S. Foglia reports that exposures taken by
R. Holmes (Ashmore, IL, U.S.A., 0.81-m telescope, June 18.4) show a
coma diameter of 5" with magnitude 19.5-20.0. R. Miles writes that
an exposure taken on June 18.44 with the 2.0-m f/10 "Faulkes
Telescope North" at Haleakala in 1".3 seeing shows the object in a
crowded star field to be diffuse and about 2".5 across with a very
faint tail about 6" long in p.a. 250 deg.

2010 UT R.A. (2000) Decl. Observer
June 15.45621 21 43 21.53 +47 35 45.7 WISE

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2010-M20.

T = 2010 Jan. 24.066 TT Peri. = 85.253
Node = 126.567 2000.0
q = 2.66207 AU Incl. = 102.120


COMET C/1998 D1, C/1999 R5, C/1999 S8 (SOHO)

Further to IAUC 9153, additional Kreutz sungrazers have been
found on SOHO website images, all stellar in appearance; peak
magnitudes were about 7-7.5 for C/1998 D1 and about 7.5 for the
others.

Comet 1998 UT R.A.(2000)Decl. Inst. F MPEC
C/1998 D1 Feb. 26.985 22 58.7 - 9 14 C3 MK 2010-L60

Comet 1999 UT R.A.(2000)Decl. Inst. F MPEC
C/1999 R5 Sept. 9.321 10 52.3 + 4 45 C3 JR 2010-L60
C/1999 S8 20.071 11 33.2 + 0 37 C3 JR 2010-L60

2010 June 18 (9154) Daniel W. E. Green

[Tikhon]

23 June 2010
IAU Circular No.9155

COMET C/2010 L5 (WISE)

Amy Mainzer, Jet Propulsion Laboratory, reports the discovery
of a relatively bright comet (discovery observation tabulated below)
that is visible in all four bands of the WISE spacecraft; the coma
is at least 30" in diameter at 12 microns, and the fan-shaped tail
is 160" long, pointing to the west-southwest. After posting on the
Minor Planet Center's 'NEOCP' webpage, ground-based CCD
astrometrists have confirmed the object's cometary appearance.
G. J. Garradd reports that images taken on June 20.83 UT with the
0.5-m Uppsala Schmidt telescope at Siding Spring show a condensed
coma of total mag 18.2 and a 30" fan toward the southwest. S.
Foglia writes that images taken remotely by L. Buzzi, P. Concari, G.
Galli, M. Tombelli, and himself with a 0.15-m f/7.3 refractor at
the Tzec Maun Observatory, Moorook, Australia, on June 22.48 show
the object to be diffuse. H. Sato (Ota-ku, Tokyo, Japan) found a
weak, condensed coma of diameter 10" and total mag 18.9 on images
taken remotely with a 0.40-m f/9.1 reflector at the RAS Observatory,
Moorook, on June 23.4.

2010 UT R.A. (2000) Decl. Observer
June 14.28890 3 12 19.87 -62 25 07.3 WISE

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2010-M50.

T = 2010 Apr. 26.626 TT Peri. = 220.563
Node = 206.152 2000.0
q = 0.83835 AU Incl. = 146.583


COMETS C/2001 W5 AND C/2002 B4 (SOHO)

Further to IAUC 9154, additional Kreutz sungrazers with
stellar appearance have been found on SOHO website images; peak
magnitudes were about 7-7.5 for C/2001 W5 and about 7.5-8 for
C/2002 B4. Astrometric measurements were by H. Dennison and K.
Battams, with reductions and orbital elements by B. G. Marsden.

Comet 2001 UT R.A.(2000)Decl. Inst. F MPEC
C/2001 W5 Nov. 22.604 15 53.5 -21 56 C2 MK 2010-L60

Comet 2002 UT R.A.(2000)Decl. Inst. F MPEC
C/2002 B4 Jan. 19.321 20 19.5 -21 56 C3 MK 2010-L60

2010 June 23 (9155) Daniel W. E. Green

[Tikhon]

23 June 2010
IAU Circular No.9156

COMET C/2010 M1 (GIBBS)

A. R. Gibbs reports his discovery of a comet (discovery
observation tabulated below) on CCD images taken in the course of
the Mount Lemmon Survey with the 1.5-m reflector; co-added images
taken during June 22.22-22.29 UT in excellent seeing show a "fuzzy"
coma of diameter 3'.5 (and magnitude 20.2-20.9) with no visible
tail; follow-up images on June 23.3 show a similar appearance (mag
20.1-20.7). After posting on the Minor Planet Center's 'NEOCP'
webpage, CCD images taken by R. S. McMillan and C. K. Maleszewski
with the Spacewatch 1.8-m f/2.7 reflector at Kitt Peak on June
23.3 also show the comet to be diffuse.

2010 UT R.A. (2000) Decl. Mag. Observer
June 22.22315 17 06 07.84 + 0 39 22.7 20.9 Gibbs

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2010-M51.

T = 2012 Feb. 7.840 TT Peri. = 265.318
Node = 82.150 2000.0
q = 2.29869 AU Incl. = 78.373


COMETS C/2009 V3-V7 AND C/2009 W3-W5 (SOHO)

Further to IAUC 9155, additional Kreutz sungrazers have been
found on SOHO website images. K. Battams notes that C/2009 V3 was
very faint (peak magnitude about 7.5-8). C/2009 V4 was slightly
diffuse with a very short tail. C/2009 V5 was somewhat diffuse.
C/2009 V6 was slightly diffuse with a "slight" tail. C/2009 V7 was
diffuse (peak mag about 6) with a "slight" tail. C/2009 W3, which
was also found by B. Zhou, was slightly diffuse (peak mag about 6.5).
C/2009 W4 was very slightly diffuse (peak mag about 6.5). C/2009
W5 was slightly diffuse (peak mag about 7-7.5).

Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 V3 Nov. 2.738 14 21.1 -16 58 C3 JR 2010-L85
C/2009 V4 3.233 14 28.0 -16 18 C2 JR 2010-L85
C/2009 V5 6.777 14 40.0 -17 57 C3/2 TS 2010-L90
C/2009 V6 13.571 15 08.1 -20 28 C3/2 ZX 2010-L90
C/2009 V7 15.738 15 12.5 -21 40 C3/2 AK 2010-L90
C/2009 W3 16.596 15 20.4 -22 29 C3/2 JR 2010-L90
C/2009 W4 17.138 15 17.4 -22 33 C3/2 JR 2010-L90
C/2009 W5 17.138 15 23.6 -21 11 C3/2 JR 2010-L90

2010 June 23 (9156) Daniel W. E. Green