[IAUC] CBET 4071: 20150302 : COMET C/2015 D4 (BORISOV)
quai en eps.harvard.edu
quai en eps.harvard.edu
Dom Mar 1 23:43:10 ART 2015
Electronic Telegram No. 4071
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/2015 D4 (BORISOV)
Gennady Borisov, Nauchnij, Crimea, reports his discovery of a comet on
three CCD images taken with a 0.3-m f/1.5 astrograph on Feb. 23.1 UT
(discovery observations tabulated below).
2015 UT R.A. (2000) Decl. Mag. Observer
Feb. 23.10458 21 08 51.59 +22 47 18.5 16.8 Borisov
23.11875 21 08 53.11 +22 47 42.4 16.9 "
23.13194 21 08 54.48 +22 48 04.4 16.9 "
25.09792 21 11 27.68 +23 37 56.2 17.4 "
25.13055 21 11 30.06 +23 38 46.9 17.5 "
After the object was posted on the Minor Planet Center's PCCP webpage, other
CCD astrometrists have commented on the object's cometary appearance.
V. Nevski writes that xix stacked 60-s exposures taken with a 0.4-m reflector
at the ISON-Byurakan Observatory in Armenia on Feb. 26.1 show a coma 12" in
diameter and a 30" tail in p.a. 185 deg. H. Sato, Tokyo, Japan, reports that
ten stacked 60-s exposures taken with an iTelescope 0.51-m f/6.8 astrograph
(+ luminance filter) near Mayhill, NM, USA, on Mar. 1.5 show the comet to be
moderately condensed with an elongated coma of size 10" x 15" (magnitude 17.7
as measured within a circular aperture of radius 8".2) and a hint of a tail
40" long toward p.a. 195 degrees.
The available astrometry, preliminary parabolic orbital elements by G. V.
Williams, and an ephemeris appear on MPEC 2015-E08.
T = 2014 Oct. 31.0668 TT Peri. = 312.7192
Node = 305.6626 2000.0
q = 0.810813 AU Incl. = 77.2920
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2015 CBAT
2015 March 2 (CBET 4071) Daniel W. E. Green
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