[IAUC] CBET 4260: 20160219 : COMET C/2016 C2 (NEOWISE)
quai en eps.harvard.edu
quai en eps.harvard.edu
Jue Feb 18 17:40:22 ART 2016
Electronic Telegram No. 4260
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 C/2016 C2 (NEOWISE)
J. Bauer, Jet Propulsion Laboratory, reports that another object found on
infrared images taken with the Near-Earth Object Wide-field Infrared Survey
Explorer (or NEOWISE; formerly the WISE earth-orbiting satellite; cf. CBET
4225) suggests the presence of a weak coma. The discovery observations are
tabulated below, in which the listed optical-wavelength magnitudes were
roughly estimated based on past WISE and NEOWISE cometary observations.
2016 UT R.A. (2000) Decl. Mag.
Feb. 8.49858 15 13 49.52 - 9 39 24.2 19
8.76077 15 14 16.40 - 9 46 30.0 19
8.76090 15 14 16.57 - 9 46 30.7
8.89193 15 14 29.88 - 9 50 03.0 19
9.02309 15 14 43.29 - 9 53 38.3
9.15412 15 14 56.73 - 9 57 14.0
9.21970 15 15 03.58 - 9 58 58.2
9.28528 15 15 10.34 -10 00 47.4
9.48202 15 15 30.59 -10 06 10.6
9.61305 15 15 44.13 -10 09 44.4
9.67863 15 15 50.78 -10 11 34.4
9.74421 15 15 57.64 -10 13 22.5
9.87524 15 16 11.09 -10 16 56.8
9.87537 15 16 11.08 -10 16 59.6
10.00640 15 16 24.48 -10 20 36.4
10.13756 15 16 38.01 -10 24 12.7
10.26859 15 16 51.58 -10 27 51.7
10.26872 15 16 51.53 -10 27 51.1
Bauer also forwards follow-up observations obtained by J. V. Scotti with the
Spacewatch 1.8-m telescope (+ Schott OG-515 filter; bandpass 515-950 nm) on
Feb. 17.5 UT: thirty stacked 73-s exposures show the comet to be very
slightly diffuse with a coma diameter of 8" and red mag 19.2-19.4, and there
is a very faint tail extending 0'.16 in p.a. 305 degrees. After the object
was posted on the Minor Planet Center's PCCP webpage, other CCD astrometrists
have also commented on the object's cometary appearance. V-band images
obtained by W. H. Ryan and E. V. Ryan with the Magdalena Ridge Observatory
2.4-m f/8.9 reflector on Feb. 11.5 and 17.4 both show a faint tail in p.a.
about 315 deg; a fuzzy appearance was noted on Feb. 11. H. Sato, Tokyo,
Japan, writes that twelve stacked 60-s exposures taken on Feb. 16.8 with a
0.51-m f/6.8 astrograph (+ luminance filter) at Siding Spring show the comet
to be strongly condensed with an asymmetrical outer coma 25" in diameter but
with no tail; the w-band magnitude was 18.0 as measured within a circular
aperture of radius 13".0.
The available astrometry (spanning Feb. 8-18), the following preliminary
parabolic orbital elements by G. V. Williams, and an ephemeris appear on MPEC
2016-D25.
T = 2016 Apr. 19.0290 TT Peri. = 214.0105
Node = 24.5586 2000.0
q = 1.567113 AU Incl. = 38.1923
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2016 CBAT
2016 February 19 (CBET 4260) Daniel W. E. Green
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