[IAUC] IAUC 9037: COMET C/2009 G1 (STEREO); COMET C/2009 F6 (YI-SWAN); C/2003 Q1, Q6; C/2008 X6; C/2008 Y10, Y11 (SOHO) [25139-2009/08-R1]
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Sab Abr 11 00:22:31 ART 2009
Circular No. 9037
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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COMET C/2009 G1 (STEREO)
K. Kadota (Ageo, Japan) has reported astrometry on Apr. 9.8 UT
with a 25-cm reflector, which shows that the prediction on IAUC
9036 was off by about 4'. He found the comet to have total mag
10.6, a coma diameter of 4'.5, and strong central condensation; his
astrometry and the following revised orbital elements appear on
MPEC 2009-G32:
T = 2009 Apr. 15.093 TT Peri. = 173.823
Node = 120.657 2000.0
q = 1.12993 AU Incl. = 108.091
COMET C/2009 F6 (YI-SWAN)
S. Korotskiy, Moscow, reports that he found a prediscovery
image of this comet (cf. IAUCs 9034, 9035) on an exposure (limiting
mag about 13) taken with a Canon EOS 20D digital camera (+ 50-mm
f/4 lens) at the Kazan State University observatory at Karachay-
Cherkessia, as given below:
2009 UT R.A. (2000) Decl. Mag.
Mar. 25.06024 22 28 28.8 +48 45 14 10.7
COMETS C/2003 Q1, Q6; C/2008 X6; C/2008 Y10, Y11 (SOHO)
Further to IAUC 9036, additional near-sun presumed comets have
been found on SOHO website images (with the initial observations
tabulated below). C/2008 Y10, a Kreutz sungrazer, was stellar in
appearance (mag about 6) in C3 images; in C2 images, it was
teardrop-shaped and slightly diffuse. C/2008 Y11, a member of the
Marsden group, was tiny and stellar in appearance (mag about 7).
R. Kracht proposed that C/2008 Y11 may be identical with C/2003 Q6
(cf. IAUC 8339), and C/2008 X6 (cf. IAUC 9030) with C/2003 Q1 (cf.
IAUC 8339); linkages by B. G. Marsden (cf. MPEC 2009-F81) suggest
that these two comets (both with P approximately 5.3 yr) may have
separated from each other around their last return to perihelion
(1998 Apr. 26-29), though Kracht was unable to find any trace of
them in C2 data from 1998 Apr. 25.
Comet 2008 UT R.A.(2000)Decl. Inst. F MPEC
C/2008 Y10 Dec. 21.988 18 09.0 -27 29 C3/2 JR 2009-F17
C/2008 Y11 22.288 17 59.0 -22 54 C2 RK 2009-F17
(C) Copyright 2009 CBAT
2009 April 10 (9037) Daniel W. E. Green
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