[IAUC] CBET 3486: 20130423 : COMET C/2012 OP (SIDING SPRING)
quai en eps.harvard.edu
quai en eps.harvard.edu
Lun Abr 22 19:53:49 ART 2013
Electronic Telegram No. 3486
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 C/2012 OP (SIDING SPRING)
An apparently asteroidal object found by R. H. McNaught last July on CCD
images taken with the 0.5-m Uppsala Schmidt telescope at Siding Spring
(discovery observations tabulated below) has been found to show cometary
appearance by L. Buzzi, who used fourteen stacked 60-s images taken with the
2.0-m "Faulkes Telescope North" on Apr. 19.5 UT that show a softer aspect
with respect to stars, with a coma at least 4" wide possibly elongated toward
the west. W. Ryan (2.4-m f/8.9 reflector + VR filter at the Magdalena Ridge
Observatory) writes that two sets of images taken on Apr. 22.42 and 22.45 UT
in approximately 1" seeing show that the object clearly has an asymmetric
coma/tail oriented at p.a. about 250 deg even in single images (but becomes
more apparent when stacked). The object was originally announced on MPEC
2012-O12 and given the minor-planet designation 2012 OP.
2012 UT R.A. (2000) Decl. Mag. Observer
July 16.62216 19 11 03.20 -65 18 37.4 20.0 McNaught
16.63506 19 10 59.93 -65 18 29.6 19.8 "
16.64817 19 10 56.44 -65 18 22.0 "
16.66105 19 10 53.10 -65 18 13.7 20.2 "
16.67303 19 10 49.99 -65 18 06.0 20.1 "
16.74880 19 10 30.17 -65 17 18.2 19.6 "
16.75391 19 10 28.83 -65 17 14.8 19.9 "
The available astrometry, the following orbital elements by G. V. Williams
(from 64 observations spanning 2012 July 16-2013 Apr. 19; mean residual 0".3),
and an ephemeris appear on MPEC 2013-H36.
Epoch = 2012 Dec. 19.0 TT
T = 2012 Dec. 4.74202 TT Peri. = 351.43541
e = 0.9966160 Node = 267.37058 2000.0
q = 3.6071110 AU Incl. = 114.82820
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2013 CBAT
2013 April 23 (CBET 3486) Daniel W. E. Green
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