Central Bureau for Astronomical Telegrams
IAUC 6759: SUNGRAZING COMETS; P/1997 T3; 75th ANNIVERSARY ISSUE
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Circular No. 6759
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)
SUNGRAZING COMETS
D. A. Biesecker, University of Birmingham, on behalf of the SOHO-LASCO
Consortium (cf. IAUC 6685), reports his discovery of two more comets,
evidently Kreutz sungrazers, in C3 and C2 coronagraphic data. Each showed
evidence for a small tail and was estimated to peak at mag about 7.
Measurements by Biesecker (assisted by C. St. Cyr for the second comet)
have been reduced by G. V. Williams and are given in detail on MPEC 1997-U06
and -U07, together with orbital solutions by the undersigned.
1997 UT R.A. (2000) Decl.
Oct. 6.218 12 31.7 - 6 06 C/1997 T4
7.217 12 32.5 - 6 48 C/1997 T5
COMET P/1997 T3
G. Hahn, DLR Institute of Planetary Exploration, Berlin, communicates
his precise measurement of the then-apparently-asteroidal object, which was
discovered by Claes-Ingvar Lagerkvist, Uppsala University Observatory, on a
film obtained with the European Southern Observatory's 1-m Schmidt on Oct. 1
in the course of the Uppsala-DLR Trojan Survey. New orbital elements from
the full Oct. 1-18 arc are given on MPEC 1997-U08. A Jupiter-Trojan orbit
(cf. IAUC 6755) is no longer viable.
1997 UT R.A. (2000) Decl.
Oct. 1.23681 1 17 11.78 + 3 13 44.0
SEVENTY-FIFTH ANNIVERSARY ISSUE
The fiftieth anniversary of the first IAU Circular was noted on IAUC
2452 on 1972 Oct. 20. The present Circular marks the seventy-fifth
anniversary, which has also been acknowledged by the naming of
(7608) Telegramia, a minor planet, provisionally designated 1995 UO1,
discovered by J. Ticha at the Klet Observatory on 1995 Oct. 22. The
following citation for this naming is extracted from MPC 30802
(dated 1997 Oct. 16): "Named on the 75th anniversary of the publication
of the first IAU Circular, which was issued on 1922 Oct. 22 by the IAU
Central Bureau for Astronomical Telegrams, then at the Copenhagen
Observatory. The Bureau moved to the Smithsonian Astrophysical Observatory
in 1965 and has now issued 6756 IAU Circulars, relating generally to
transient astronomical objects and phenonena in urgent need of further
observation. Name proposed by the discoverer and endorsed by her
colleagues M. Tichy and Z. Moravec."
(C) Copyright 1997 CBAT
1997 October 22 (6759) Brian G. Marsden
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