[IAUC] IAUC 8735: COMET P/2006 HR_30 (SIDING SPRING); C/1999 V5, C/1999 X3 [25139-2007/05-R1]
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Circular No. 8735
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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COMET P/2006 HR_30 (SIDING SPRING)
Reports from two groups of observers indicate that 2006 HR_30,
reported as asteroidal when discovered by the Siding Spring Survey
(discovery observation tabulated below; cf. MPEC 2006-H40), appears
cometary. A co-addition of three 10-s V-band exposures, obtained
on July 29.3 UT by S. C. Lowry and A. Fitzsimmons (Department of
Physics and Astronomy, Queen's University, Belfast) with the 3.5-m
New Technology Telescope at the European Southern Observatory (ESO),
La Silla, show a coma extending to 5".5 in p.a. 31 deg.
Observations by M. Hicks and K. Lawrence (Jet Propulsion Laboratory)
on Aug. 3 with the Palomar 5-m Hale telescope show a faint coma
extending approximately 10" from the 'nucleus' in both the R-band
and long-slit spectral images.
2006 UT R.A. (2000) Decl. Mag.
Apr. 20.78181 22 04 31.90 - 9 04 14.9 18.7
Recent astrometry, the following orbital elements (from
observations in 2005 and 2006), and an ephemeris appear on MPEC
2006-P09. There is also an unconfirmed observation of this object
on a 2-hr ESO exposure from 1986 Mar. 5, measured by G. Forti
(Arcetri Observatory, Florence) and published on MPS 174727.
Epoch = 2007 Jan. 20.0 TT
T = 2007 Jan. 2.2815 TT Peri. = 117.4137
e = 0.843142 Node = 309.9512 2000.0
q = 1.226435 AU Incl. = 31.8845
a = 7.818745 AU n = 0.0450815 P = 21.86 years
COMETS C/1999 V5 AND C/1999 X3 (SOHO)
Further to IAUC 8734, given below are the discovery data for
additional small, stellar-appearing comets found on archival SOHO
images. C/1995 V5, a Kreutz sungrazer, was of mag about 7.5 or
fainter. C/1999 X3, not a member of any known comet group (T =
1999 Dec. 12.7 TT, q = 0.081, e = 1.0, i = 7.2 deg), was too faint
for photometry.
Comet 1999 UT R.A.(2000)Decl. Inst. F MPEC
C/1999 V5 Nov. 14.379 15 13.6 -19 34 C2 HS 2006-O20
C/1999 X3 Dec. 12.564 17 22.9 -23 22 C2 HS 2006-L20
(C) Copyright 2006 CBAT
2006 August 3 (8735) Daniel W. E. Green
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