[IAUC] CBET 4138: 20150820 : COMET C/2015 Q1 (SCOTTI)
quai en eps.harvard.edu
quai en eps.harvard.edu
Mie Ago 19 17:53:00 ART 2015
Electronic Telegram No. 4138
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/2015 Q1 (SCOTTI)
J. V. Scotti, Lunar and Planetary Laboratory, reports his discovery of
a diffuse comet with a short tail extending toward the west on CCD mosaic
images obtained with the Spacewatch 0.9-m f/3 reflector at Kitt Peak
(discovery astrometry tabulated below). Scotti adds that the comet shows a
8" coma with a tail about 0'.23 long in p.a. 272 degrees. His follow-up
observations with the Spacewatch 1.8-m f/2.7 reflector on Aug. 19.44-19.46
UT show a 8".4 coma and tail extending 1'.25 in p.a. 271 degrees in stacked
exposures.
2015 UT R.A. (2000) Decl. Mag. Observer
Aug. 18.45786 4 14 32.11 +17 57 15.2 18.9 Scotti
18.47195 4 14 34.15 +17 57 08.6 18.9 "
18.48605 4 14 36.15 +17 57 01.9 18.9 "
19.44241 4 16 55.43 +17 49 32.1 18.3 "
19.44993 4 16 56.51 +17 49 28.5 18.1 "
19.45743 4 16 57.58 +17 49 24.9 "
After the comet was posted on the Minor Planet Center's PCCP webpage, other
CCD astrometrists have commented on the cometary appearance. H. Sato, Tokyo,
Japan, writes that sixteen stacked 60-s exposures taken with an iTelescope
0.51-m f/6.8 astrograph at Siding Spring on Aug. 18.8 UT show the comet to be
strongly condensed with a coma 10" in diameter and a tail 60" long toward
p.a. 275 degrees; the w-band magnitude was 18.0 as measured within a circular
aperture of radius 6".6. J.-F. Soulier obtained images with a 0.30-m f/3.8
Newtonian reflector at Maisoncelles, France, on Aug. 19.05-19.11 that show a
15" coma and a tail 36" long in p.a. 260 deg; A. Maury and Soulier also
obtained images with a 0.4-m f/8 Ritchey-Chretien reflector at San Pedro de
Atacama, Chile, on Aug. 19.33-19.36 that show a 12" coma and a tail 30" long
in p.a. 255 deg. W. H. Ryan, Magdalena Ridge Observatory, found the comet
to show a distinct tail toward p.a. about 270 deg on R-band images taken
with the 2.4-m f/8.9 reflector on Aug. 19.44-19.46.
The available astrometry, the following preliminary parabolic orbital
elements by G. V. Williams, and an ephemeris appear on MPEC 2015-Q25.
T = 2015 Oct. 2.0871 TT Peri. = 210.3958
Node = 208.0539 2000.0
q = 1.903668 AU Incl. = 24.7569
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2015 CBAT
2015 August 20 (CBET 4138) Daniel W. E. Green
Más información sobre la lista de distribución Iauc