Central Bureau for Astronomical Telegrams
IAUC 6750: C/1997 S1; CCO 1997; XTE J1739-302
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Circular No. 6750
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)
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Phone 617-495-7244/7440/7444 (for emergency use only)
COMET C/1997 S1 (SOHO)
C. St. Cyr, Naval Research Laboratory, on behalf of the SOHO-LASCO
Consortium (cf. IAUC 6685), reports that D. Biesecker, University of
Birmingham, has discovered a comet in both C3 and C2 coronagraphic data.
The peak brightness was perhaps mag about 7, and there may have been a
small tail in some of the C2 images. Measurements by Biesecker and St. Cyr
have been reduced by G. V. Williams and are published in detail on MPEC
1997-T01, together with a Kreutz-type orbital solution by the undersigned.
1997 UT R.A. (2000) Decl.
Sept.29.865 12 02.4 - 3 57
CATALOGUE OF COMETARY ORBITS 1997
The twelfth edition of the Catalogue of Cometary Orbits, complete
through the entries in the Sept. 1997 batch of Minor Planet
Circulars, is now available. There is a tabulation giving osculating
elements for the 132 numbered periodic comets (except for seven that are
lost) for the standard epochs 1997 June 1 and Dec. 18, 1998 July 6 and
1999 Jan. 22. 'Original' and 'future' reciprocal semimajor axes are
given for the 308 high-quality long-period orbits. There is also a
more extended list of 'X/ comets' for which orbits cannot be computed.
The 119-page Catalogue sells for $30.00 ($40.00 for airmail delivery
outside North America). There is also an e-mail edition (with just the
basic orbital information) for $50.00. Payment can be made by credit
card. Orders can be sent to iausubs@cfa.harvard.edu
or to the FAX number or postal address at the top of this Circular.
XTE J1739-302
R. M. Hjellming, National Radio Astronomy Observatory, reports:
"Very Large Array observations on Sept. 26, 30 and
Oct. 1 show two candidate radio sources inside and one on the edge of
the error region for XTE J1739-302 (cf. IAUC 6748). Positions are:
source A, R.A. = 17h38m57s.8, Decl. = -30d08'43" (equinox 2000.0,
uncertainties 0s.1 and 2"); source B, 17h38m52s.2s, -30d09'01"; source
C, 17h39m00s.6, -30d11'35". Sources A and C have not shown significant
variations about fluxes of 4.2 and 4.5 mJy at 4.86 and 8.46 GHz; however,
source B may have varied between 9 and 12 mJy at 4.86 GHz from Sept. 26
to Oct. 1, and between 4 and 8 mJy at 8.46 GHz from Sept. 30 to Oct. 1.
On this basis source B is the most likely candidate for the radio
counterpart of XTE J1739-302. Further observations continue to determine
the variability characteristics of these sources."
(C) Copyright 1997 CBAT
1997 October 3 (6750) Brian G. Marsden
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