[IAUC] CBET 4215: 20151208 : COMET P/2015 X3 (PANSTARRS)
quai en eps.harvard.edu
quai en eps.harvard.edu
Mar Dic 8 15:41:39 ART 2015
Electronic Telegram No. 4215
Central Bureau for Astronomical Telegrams
Mailing address: 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/2015 X3 (PANSTARRS)
R. J. Wainscoat reports that an object found on four r-band exposures
obtained on Dec. 1.4 UT with the 1.8-m Pan-STARRS1 telescope on Haleakala
shows hints of being extended (discovery observations tabulated below,
together with pre-discovery Pan-STARRS1 observations from November that were
found later), and he obtained three 60-s w-band follow-up observations using
the 3.6-m Canada-France-Hawaii Telescope on Dec. 5.50 with M. Micheli and C.
Wipper that show the object to be distinctly extended (FWHM 1".7 in 0".9
seeing) with a broad, low-surface-brightness tail extending for approximately
3" to the south (with red mag 20.4-20.5 measured).
2015 UT R.A. (2000) Decl. Mag.
Nov. 6.38775 3 35 39.77 + 0 21 04.1 20.6
6.39946 3 35 39.16 + 0 21 06.9 20.7
15.40784 3 28 02.43 + 1 03 45.1 20.4
15.41997 3 28 01.82 + 1 03 49.3 20.5
15.43213 3 28 01.17 + 1 03 53.1 20.5
15.44436 3 28 00.50 + 1 03 57.0 20.5
Dec. 1.40586 3 15 03.71 + 2 47 07.8 21.1
1.41720 3 15 03.20 + 2 47 12.7 21.4
1.42863 3 15 02.67 + 2 47 17.9 21.1
1.43976 3 15 02.17 + 2 47 23.2 20.8
After the comet was posted on the Minor Planet Center's PCCP webpage, other
CCD astrometrists also noted the object's cometary appearance. H. Sato,
Tokyo, Japan, writes that twelve stacked 60-s exposures taken with an
iTelescope 0.51-m f/6.8 astrograph (+ luminance filter) near Mayhill, NM,
U.S.A., on Dec. 7.22 UT shows the comet to be strongly condensed with a coma
6" in diameter and no tail; the w-band magnitude was 20.0 as measured within
a circular aperture of radius 4".9. V-band images taken by W. H. Ryan and
E. V. Ryan with the Magdalena Ridge Observatory 2.4-m f/8.9 reflector on Dec.
8.3 show a coma with a faint, wide tail at p.a. about 170 deg.
The available astrometry, the following elliptical orbital elements by
G. V. Williams, and an ephemeris appear on MPEC 2015-X104.
Epoch = 2015 Aug. 6.0 TT
T = 2015 Aug. 7.7971 TT Peri. = 306.8911
e = 0.438323 Node = 77.3265 2000.0
q = 2.822575 AU Incl. = 24.3793
a = 5.025262 AU n = 0.0874915 P = 11.3 years
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2015 CBAT
2015 December 8 (CBET 4215) Daniel W. E. Green
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