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THE ASTRONOMER Electronic Circular No 2558      2009 Jun 18 19.13UT
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 P/2009 L2 (YANG-GAO)
Rui Yang and Xing Gao, China, report on IAUC 9052 their discovery of a 
new comet on several survey images (limiting mag about 15) of 2009 June 
15.8UT taken by Gao in the course of the Xingming Comet Survey using a 
Canon 350D camera (+ 10.7-cm f/2.8 camera lens) at Mt. Nanshan -- the 
new object identified as cometary by Yang.
      2009 UT             R.A. (2000) Decl.       Mag.   Observer
      June 15.80840   18 16 19.40   -14 15 30.7   14.2   Yang

Following an appeal by the Central Bureau, a number of CCD observers 
reported the object to have cometary appearance during June 16.4-16.7 
UT.

Ernesto Guido and Giovanni Sostero using the remote telescope of GRAS at 
Mayhill reported direct to TAHQ with an image of June 16 ten co-added 
unfiltered 60-s exposures show a coma of diameter about 40" and a tail 
nearly 90" long in p.a. 245 deg)

Enrico Prosperi and Paul Camilleri (remotely using a 36-cm reflector at 
Grove Creek Observatory, Trunkey, N.S.W., Australia reported to CBAT 30" 
coma with 70" tail in p.a. 240 deg

Brian Marsden reports on M.P.E.C. 2009-M13 updated orbital elements and 
ephemeris for this comet:

T 2009 May 21.658 TT                                    MPC
q   1.29650              (2000.0)            P               Q
n   0.154106       Peri.  346.864       -0.395013       +0.876822
a   3.44554        Node   259.315       -0.815640       -0.472039
e   0.62372        Incl.   16.199       -0.422725       +0.091450
P   6.40
 From 147 observations 2009 June 15-18.

Ephemeris:
Date    TT    R. A. (2000) Decl.     Delta    r   Elong.  e   m1
2009 06 18    18 17.46   -12 21.8    0.327  1.337   166.7   13.8
2009 06 23    18 19.59   -08 26.6    0.345  1.352   164.7   14.0
2009 06 28    18 21.32   -05 06.8    0.367  1.370   161.8   14.2
2009 07 03    18 22.91   -02 23.1    0.393  1.390   158.5   14.4
2009 07 08    18 24.54   -00 13.3    0.423  1.412   155.3   14.6
2009 07 13    18 26.34   +01 25.9    0.456  1.435   152.1   14.9
2009 07 18    18 28.41   +02 38.3    0.492  1.460   149.1   15.1
2009 07 23    18 30.84   +03 28.1    0.531  1.487   146.2   15.4
2009 07 28    18 33.70   +03 59.0    0.574  1.516   143.4   15.6

Guy M Hurst