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IAUC 9036: COMET C/2009 G1 (STEREO); C/2008 Y6-Y9

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                                                  Circular No. 9036
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2009 G1 (STEREO)
     Further to IAUC 9032, K. Battams reports that a slightly
diffuse comet of mag about 10-11 with no apparent tail (discovery
observation tabulated below) has been found on SECCHI HI-1B images
(cf. IAUC 8930, 8955).

 Comet        2009 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2009 G1    Apr.  3.572   21 03.2  - 6 25   HI*    JR   2009-G30

     The reduced astrometry by B. G. Marsden, together with the
following preliminary parabolic orbital elements (from 36
observations, Apr. 3-6) and an ephemeris, appear on MPEC 2009-G30.

     T = 2009 Apr. 12.635 TT          Peri. = 170.978
                                      Node  = 120.785   2000.0
     q = 1.13701 AU                   Incl. = 107.788

The following geocentric ephemeris assumes H_10 = 9.0.

2009 TT   R. A. (2000) Decl.   Delta     r     Elong.  Phase   Mag.
Apr.  9   22 32.70  - 0 09.4   1.704   1.139    40.1    34.5   10.7
     11   22 36.03  - 1 15.1   1.674   1.137    41.5    35.7   10.7
     13   22 39.45  - 2 23.3   1.644   1.137    42.9    36.9   10.6
     15   22 42.97  - 3 34.1   1.614   1.138    44.3    38.0   10.6
     17   22 46.61  - 4 47.9   1.583   1.139    45.8    39.2   10.6
     19   22 50.36  - 6 04.7   1.551   1.142    47.3    40.3   10.5


COMETS C/2008 Y6-Y9 (SOHO)
     Additional Kreutz sungrazers were found on SOHO website images
(cf. IAUC 9032).  C/2008 Y6 (mag about 6.5-7), C/2008 Y7 (mag about
6-6.5), and C/2008 Y8 mag about 7-7.5) were small and stellar in
appearance in C3 images; C2 images showed C/2008 Y6 and C/2008 Y8
as slightly diffuse, and C/2008 Y7 as teardrop-shaped, with C/2008
Y6 and C/2008 Y7 each showing a short, faint tail.  C/2008 Y9 was
faint (mag about 8) and diffuse.

 Comet        2008 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2008 Y6    Dec. 21.138   18 04.5  -27 12   C3/2   MU   2009-E63
 C/2008 Y7         21.154   18 04.7  -27 19   C3/2   MU   2009-E63
 C/2008 Y8         21.571   18 05.8  -25 52   C3/2   MK   2009-E63
 C/2008 Y9         21.588   18 04.6  -25 12   C2     MK   2009-E63

                      (C) Copyright 2009 CBAT
2009 April 9                   (9036)            Daniel W. E. Green

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