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IAUC 9134: COMET C/2010 G2 (HILL); 234P

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                                                  Circular No. 9134
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  D. W. E. Green, Room 209; Department of
 Earth and Planetary Sciences; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
CBAT@IAU.ORG; CBATIAU@EPS.HARVARD.EDU
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304


COMET C/2010 G2 (HILL)
     R. E. Hill reports his discovery of a comet on Catalina Sky
Survey CCD images taken with the 0.68-m Schmidt telescope
(discovery observation tabulated below); four co-added 40-s
exposures taken in 2"-3" seeing during Apr. 10.45-10.47 UT show a
diffuse coma about 6"-8" across with a broad, diffuse tail about
8"-10" long in p.a. 200 deg.  Four co-added 60-s follow-up images
by R. A. Kowalski and G. M. Hupe with the Mt. Lemmon 1.5-m
reflector on Apr. 10.5 also show the faint, broad, straight tail in
p.a. about 200 deg; additional images with the same telescope by S.
M. Larson on Apr. 11.44-11.46 show a 20" tail in p.a. 200 deg.
After posting on the Minor Planet Center's 'NEOCP' webpage, other
cometary astrometrists have also commented on this object's
cometary appearance during Apr. 11.2-11.7.  A. Novichonok and D.
Chestnov (remotely with a 36-cm Maksutov-Newtonian telescope at
Tzec Maun Observatory near Cloudcroft, NM, U.S.A.) found an obvious
faint coma with diameter 0'.2 and no tail.  W. H. Ryan and E. V.
Ryan (Magdalena Ridge Observatory, 2.4-m reflector) find a coma
and a faint tail in p.a. about 200 deg on R-band images.  E. Guido
and G. Sostero (remotely using a 0.25-m reflector at the RAS
Observatory, Mayhill, NM) report that eighteen co-added 120-s
unfiltered exposures reveal a diffuse coma nearly 10" in diameter;
H. Sato, Ota-ku, Tokyo, Japan (also remotely using a 0.25-m
reflector at the same site) measures a 15" coma.  R. Ligustri,
Udine, Italy (remotely using a 0.40-m reflector at the RAS
Observatory, Moorook, Australia) writes that eleven 180-s co-added
images show a faint 20" tail in p.a. 235 deg.

     2010 UT             R.A. (2000) Decl.       Mag.   Observer
     Apr. 10.42936   16 44 05.35   +10 27 21.1   19.2   Hill

The available astrometry, the following very preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2010-G87:

     T = 2011 June 19.639 TT          Peri. = 150.748
                                      Node  = 244.701   2000.0
     q = 1.25708 AU                   Incl. = 101.001


COMETS 234P/LINEAR AND 235P/LINEAR
     Comet P/2010 E4 = 2002 CF_140 (cf. IAUC 9126) has been given
the permanent number 234P.  Comet P/2010 F2 = P/2002 FA_9 (cf.
IAUC 9130) has been given the permanent number 235P.

                      (C) Copyright 2010 CBAT
2010 April 11                  (9134)            Daniel W. E. Green

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