[IAUC] CBET 3310: 20121125 : COMET P/2012 US_27 (SIDING SPRING)
quai en eps.harvard.edu
quai en eps.harvard.edu
Dom Nov 25 10:23:51 ART 2012
Electronic Telegram No. 3310
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 US_27 (SIDING SPRING)
An apparently asteroidal object discovery by R. H. McNaught on CCD iamges
taken with the 0.5-m Uppsala Schmidt telescope at Siding Spring on Oct. 17
(discovery observations tabulated below; given the minor-planet designation
2012 US_27 when announced on MPEC 2012-U49) has now been found by McNaught to
have brightened noticeably and to show cometary appearance; his images taken
with the same telescope on Nov. 21.5 UT show V magnitude 17.5-17.7 and a vague
suggestion of a 10" tail in p.a. 70 deg; the object appears slightly larger
(FWHM = 4".9) than nearby stars of similar brightness (FWHM = 4".1), an
appearance that was confirmed on frames taken by McNaught on Nov. 24.5 (FWHM
5".7 vs. 4".5). His follow-up images on Nov. 22.5 show again a vague
suggestion of a tail to the east, and he again notices the suggestion of a 10"
tail in p.a. 70 deg on image taken on Nov. 25.5.
2012 UT R.A. (2000) Decl. Mag. Observer
Oct. 17.58428 0 48 42.67 -47 27 08.5 19.1 McNaught
17.59833 0 48 41.18 -47 26 55.1 18.8 "
17.61253 0 48 39.65 -47 26 41.0 18.8 "
17.62673 0 48 38.16 -47 26 27.6 18.8 "
17.76557 0 48 23.77 -47 24 13.9 "
The available astrometry, the following elliptical orbital elements by G. V.
Williams, and an ephemeris appear on MPEC 2012-W47.
T = 2013 Feb. 8.5770 TT Peri. = 1.2790
e = 0.648233 Node = 49.2127 2000.0
q = 1.820649 AU Incl. = 39.2887
a = 5.175727 AU n = 0.0837042 P = 11.8 years
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2012 CBAT
2012 November 25 (CBET 3310) Daniel W. E. Green
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