[IAUC] CBET 3269: 20121025 : COMET P/2012 TB_36 (LEMMON)
quai en eps.harvard.edu
quai en eps.harvard.edu
Jue Oct 25 08:50:03 ART 2012
Electronic Telegram No. 3269
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 TB_36 (LEMMON)
An apparently asteroidal object discovered on images taken on Oct. 5 by
S. M. Larson in the course of the Mount Lemmon Survey (discovery observations
tabulated below), and given the minor-planet designation 2012 TB_36 by the
Minor Planet Center, has been found to show cometary appearance elsewhere.
Marco Micheli and Richard Wainscoat report that images obtained on Oct. 9 UT
with the PanSTARRS1 telescope at Haleakala show its point-spread function to
have a full-width-at-half-maximum of about 1".25, compared with about 0".8
for nearby stellar objects, with a faint 4" tail at p.a. about 225 degrees.
Additional images obtained by Garrett Elliott with the University of Hawaii
2.2-m telescope on Oct. 17 UT confirm the cometary nature: the object shows
a faint 4" tail toward p.a. about 240 deg; the PSF has FWHM 1".6, while
nearby stars in the same images typically have a FWHM of 1".3.
2012 UT R.A. (2000) Decl. Mag. Observer
Oct. 5.29464 0 32 49.02 + 3 33 19.2 19.9 Larson
5.30138 0 32 48.80 + 3 33 18.6 20.1 "
5.30819 0 32 48.58 + 3 33 18.0 20.2 "
5.31507 0 32 48.37 + 3 33 16.7 20.1 "
The available astrometry (including pre-discovery Mt. Lemmon observations
obtained on Sept. 17), the following elliptical orbital elements by G. V.
Williams, and an ephemeris appear on MPEC 2012-U95.
T = 2013 July 18.7558 TT Peri. = 36.4000
e = 0.384393 Node = 9.5860 2000.0
q = 4.266327 AU Incl. = 6.9710
a = 6.930275 AU n = 0.0540230 P = 18.24 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superseded by text appearing later in the printed IAU Circulars.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 25 (CBET 3269) Daniel W. E. Green
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