[IAUC] CBET 3878: 20140523 : COMET P/2014 K2 = 2007 RJ_236 (LEMMON-PANSTARRS)
quai en eps.harvard.edu
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Jue Mayo 22 20:57:32 ART 2014
Electronic Telegram No. 3878
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/2014 K2 = 2007 RJ_236 (LEMMON-PANSTARRS)
Bryce Bolin, Richard Wainscoat, Marco Micheli, Henry Hsieh, and Larry
Denneau report the discovery of a diffuse comet on four 45-s w-band exposures
from the Pan-STARRS1 telescope on Haleakala on May 21 (discovery observations
tabulated below). Three 60-s R-band follow-up exposures obtained with the
Canada-France-Hawaii Telescope (+ Megaprime camera; queue observer Lisa Wells)
on May 22 confirm the cometary appearance and indicate a hint of asymmetric
extension toward p.a. 120 degrees. Additional Pan-STARRS1 images were then
found on Apr. 29.
2014 UT R.A. (2000) Decl. Mag.
May 21.39261 14 41 08.89 - 7 43 13.2 21.4
21.40462 14 41 08.48 - 7 43 12.0 21.5
21.41662 14 41 08.07 - 7 43 10.6 21.2
21.42859 14 41 07.67 - 7 43 09.4 21.2
G. V. Williams then linked these May 21 observations with an object discovered
via the Mount Lemmon Survey 1.5-m reflector on 2007 Sept. 13 (discovery
observations tabulated below; observer E. C. Beshore), when it was reported as
apparently asteroidal at four different observatories (2007 Aug. 16-Oct. 2)
and given the minor-planet designation 2007 RJ_236 on MPS 217811 (and MPS
280214).
2007 UT R.A. (2000) Decl. Mag. Observer
Sept.13.30374 22 53 49.16 -13 11 33.7 19.3 Beshore
13.31041 22 53 48.91 -13 11 35.2 19.3 "
13.31708 22 53 48.69 -13 11 36.8 19.3 "
13.32375 22 53 48.44 -13 11 38.7 19.4 "
The available astrometry, the following linked orbital elements by G. V.
Williams (from 28 observations spanning 2007 Aug. 16-2014 May 22; mean
residual 0".4), and an ephemeris appear on MPEC 2014-K28.
Epoch = 2007 June 29.0 TT
T = 2007 July 4.62049 TT Peri. = 208.20226
e = 0.2304461 Node = 121.82905 2000.0
q = 3.2776578 AU Incl. = 6.03791
a = 4.2591659 AU n = 0.11212882 P = 8.790 years
Epoch = 2016 May 12.0 TT
T = 2016 Apr. 30.50919 TT Peri. = 208.26880
e = 0.2283900 Node = 121.78149 2000.0
q = 3.3026600 AU Incl. = 6.03092
a = 4.2802195 AU n = 0.11130252 P = 8.855 years
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2014 CBAT
2014 May 23 (CBET 3878) Daniel W. E. Green
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