[IAUC] IAUC 9036: COMET C/2009 G1 (STEREO); C/2008 Y6-Y9 [25139-2009/08-R1]
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Jue Abr 9 14:34:20 ART 2009
Circular No. 9036
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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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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