[IAUC] CBET 4102: 20150523 : COMET P/2015 J3 (NEOWISE)
quai en eps.harvard.edu
quai en eps.harvard.edu
Vie Mayo 22 22:51:23 ART 2015
Electronic Telegram No. 4102
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/2015 J3 (NEOWISE)
An object found on infrared images taken with the Near-Earth Object
Wide-field Infrared Survey Explorer (or NEOWISE; formerly the WISE satellite;
astrometry tabulated below, with the optical-wavelength magnitude estimated)
has been found to be cometary by ground-based CCD astrometrists.
2015 UT R.A. (2000) Decl. Mag.
May 15.05651 21 40 29.55 -12 51 38.6 19
15.18767 21 40 43.46 -12 51 11.5
15.71281 21 41 38.57 -12 49 34.6
15.84397 21 41 52.19 -12 49 09.7
15.97525 21 42 05.92 -12 48 44.3
16.04083 21 42 12.66 -12 48 33.8
16.04096 21 42 12.76 -12 48 33.6
16.10654 21 42 19.55 -12 48 22.2
16.17211 21 42 26.37 -12 48 11.2
16.30340 21 42 40.05 -12 47 47.5
After the object was posted on the Minor Planet Center's PCCP webpage, the
following reports have been received of cometary appearance. R. A. Mastaler
writes that 120-s exposures taken on May 19.45-19.47 UT with the Spacewatch
1.8-m f/2.7 reflector (+ broadband Schott OG-515 filter) at Kitt Peak show a
diffuse tail about 5" long in p.a. 260-270 degrees; the magnitude was measured
to be 18.8-19.7. H. Sato, Tokyo, Japan, reports that twelve stacked 60-s
exposures taken with an iTelescope 0.51-m f/6.8 astrograph (+ luminance filter)
near Mayhill, NM, USA, on May 20.4 show the object to have a moderately
condensed coma 12" in diameter but no tail; the w-band magnitude was 19.2 as
measured within a circular aperture of radius 6".5.
The available astrometry, the following preliminary elliptical orbital
elements by G. V. Williams, and an ephemeris appear on MPEC 2015-K55.
T = 2015 Mar. 4.3340 TT Peri. = 129.6804
e = 0.563313 Node = 111.5159 2000.0
q = 1.498309 AU Incl. = 8.1344
a = 3.431083 AU n = 0.1550805 P = 6.36 years
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2015 CBAT
2015 May 23 (CBET 4102) Daniel W. E. Green
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