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THE ASTRONOMER Electronic Circular No 2634      2010 Apr 09 15.25UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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COMET C/2010 G1 (BOATTINI)
A. Boattini, Lunar and Planetary Laboratory, University of Arizona,
reports on IAUC 9133 his discovery of a comet on Catalina Sky Survey CCD
images of 2010 Aoril 5 taken with the 0.68-m Schmidt telescope, the
object described as diffuse with a strong, condensed coma about 40" in
size, and a fainter coma out to a diameter about 2' that fades into the
background; the coma is slightly elongated in p.a. 50-55 deg.

     2010 UT             R.A. (2000) Decl.       Mag.   Observer
     Apr.  5.12030    4 08 50.37   +27 39 02.3   13.9   Boattini

Following an appeal by the Central Bureau, other CCD astrometrists have
commented on the object's cometary appearance during Apr. 5.2-6.1 UT,
including A. R. Gibbs with the Mt. Lemmon 1.5-m reflector (four co-added
5-s exposures at altitude 20 deg show a core surrounded by 'fuzziness',
of size 16" x 23"), Peter Birtwhistle (Great Shefford, England, 0.40-m
reflector, bright twilight; coma diameter 15" and tail 30" long in p.a.
65 deg).

Dr. Brian Marsden provides elements and ephemeris on M.P.E.C. 2010-G44:

Orbital elements:
T 2010 Apr. 2.800 TT                                    MPC
q   1.20497              (2000.0)            P               Q
                   Peri.  168.902       -0.257021       -0.247842
                   Node   287.453       +0.794660       +0.495845
e   1.0            Incl.   78.283       +0.549960       -0.832293
>From 111 observations 2010 Apr. 5-7.

Ephemeris:
Date    TT    R. A. (2000) Decl.  Delta   r     Elong.  Phase   m1
2010 04 04    04 04.97   +28 26.9 1.547 1.205    51.2   40.3  14.3
2010 04 14    04 36.47   +21 36.4 1.659 1.218    46.8   36.9  14.5
2010 04 24    05 02.68   +15 25.3 1.780 1.250    43.0   33.3  14.7
2010 05 04    05 25.43   +09 51.2 1.900 1.299    39.9   29.8  15.0
2010 05 14    05 45.96   +04 47.7 2.016 1.364    37.6   26.9  15.4
2010 05 24    06 05.09   +00 07.1 2.124 1.440    36.4   24.7  15.7

SUPERNOVAE 2010Q, 2010R, AND 2010S
CRT Discoveries of possible supernovae (CBET 2151):
SN      2010 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2010Q   Jan 15.40   10 26 27.11  +39 01 50.9  19.2    1  "W
2010R   Jan 15.45   12 17 10.49  +25 39 58.7  18.3    1  "W
2010S   Jan 16.12   01 39 04.48  -00 37 12.2  18.4       --

Guy M Hurst