[IAUC] CBET 3254: 20121016 : COMET P/2012 T2 (PANSTARRS)
quai en eps.harvard.edu
quai en eps.harvard.edu
Mar Oct 16 07:55:20 ART 2012
Electronic Telegram No. 3254
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
e-mail: cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network
COMET P/2012 T2 (PANSTARRS)
Richard Wainscoat and Henry Hsieh report the discovery of a comet in four
w-band exposures taken with the 1.8-m Pan-STARRS 1 telescope at Haleakala
(discovery observations tabulated below); the object is obviously non-stellar
and has a very diffuse nuclear condensation with FWHM > 2" (seeing
approximately 1".2) and a diffuse tail extending to the northwest. Hsieh
adds that follow-up images obtained by Sarah Sonnett and Megan Ansdell with
the University of Hawaii 2.2-m telescope on Mauna Kea on Oct. 14 UT, and by
Scott Sheppard and Chad Trujillo with the 6.5-m Magellan Baade telescope at
Las Campanas on Oct. 15, confirm that the object is clearly cometary; in the
deeper Magellan data, the comet exhibits a curved tail approximately 15" long,
initially aligned with a p.a. of about 340 degrees but then curving towards a
p.a. about 260 degrees. After posting on the Minor Planet Center's NEOCP
webpage, other CCD astrometrists have also commented on the object's
cometary appearance. H. Sato (Tokyo, Japan; remotely using a 0.51-m f/6.8
astrograph at the RAS Observatory near Mayhill, NM, U.S.A.) found a 12"
coma of V-band magnitude 19.6 (as measured within a circular aperture of
radius 6".6) and a fan-like tail 25" long toward p.a. 330 degrees in images
taken on Oct. 11.2; his images from Oct. 14.3 show a diffuse coma of diameter
10" (V = 19.7 in a circular aperture of radius 4".9) with no obvious tail.
T. H. Bressi (Spacewatch 1.8-m f/2.7 reflector; Oct. 13.3 and 14.2) reports
the object as diffuse.
2012 UT R.A. (2000) Decl. Mag.
Oct. 10.35956 0 31 52.16 -12 28 05.1 21.1
10.37347 0 31 51.75 -12 28 06.6 21.0
10.38740 0 31 51.31 -12 28 07.6 21.1
10.40131 0 31 50.89 -12 28 09.2 21.0
The available astrometry, the following preliminary elliptical orbital
elements by G. V. Williams, and an ephemeris appear on MPEC 2012-U3.
T = 2011 Aug. 29.4442 TT Peri. = 253.7738
e = 0.114565 Node = 72.3013 2000.0
q = 4.884726 AU Incl. = 12.7695
a = 5.516752 AU n = 0.0760639 P = 13.0 years
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2012 CBAT
2012 October 16 (CBET 3254) Daniel W. E. Green
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