Central Bureau for Astronomical Telegrams
IAUC 5792: 1992t; CCO 1993
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Circular No. 5792
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
PERIODIC COMET SWIFT-TUTTLE (1992t)
Astrometric observations have been reported at two observatories
on seven nights since the comet returned to the morning sky in
February. Continuation to the ephemeris on IAUC 5715:
1993 TT R. A. (2000) Decl. Delta r Elong. Phase m1
May 13 3 47.8 -70 51.9 2.267 2.472 89.4 24.1 12.2
18 4 28.4 -70 53.8 2.304 2.530 90.8 23.6 12.4
23 5 07.4 -70 33.6 2.348 2.588 91.9 23.0 12.5
28 5 43.63 -69 55.0 2.399 2.646 92.6 22.5 12.7
June 2 6 16.42 -69 02.4 2.456 2.703 92.9 22.0 12.9
7 6 45.65 -68 00.4 2.518 2.760 92.8 21.5 13.1
12 7 11.56 -66 53.0 2.586 2.817 92.4 21.1 13.3
17 7 34.51 -65 43.4 2.659 2.874 91.6 20.7 13.5
22 7 54.92 -64 34.3 2.737 2.930 90.6 20.3 13.7
27 8 13.18 -63 27.5 2.818 2.986 89.4 19.9 13.9
July 2 8 29.62 -62 24.3 2.903 3.042 88.0 19.5 14.1
7 8 44.53 -61 25.6 2.990 3.097 86.4 19.1 14.2
12 8 58.18 -60 31.9 3.080 3.152 84.6 18.7 14.4
17 9 10.74 -59 43.5 3.172 3.207 82.8 18.3 14.6
22 9 22.39 -59 00.6 3.264 3.261 80.9 17.9 14.8
27 9 33.25 -58 23.3 3.358 3.315 78.9 17.5 14.9
Aug. 1 9 43.43 -57 51.4 3.452 3.369 76.9 17.1 15.1
CATALOGUE OF COMETARY ORBITS 1993
By popular request, a new edition - the eighth - of the Catalogue
of Cometary Orbits is now available, little more than a year
after its predecessor. The 102 pages contain orbital elements (in
the J2000.0 system) for 1392 cometary apparitions through April
1993. Greater efficiency in printing now allows the names of the
comets to appear together with the orbits. The new catalogue sells
at the same price as the seventh edition: $20.00, although
subscribers to these Circulars can purchase it for $10.00 and have
their accounts debited by this amount. The main part of the
catalogue and the table of 'original' and 'future' 1/a values for the
289 long-period comets with orbits of the highest quality can be
supplied by e-mail for $50.00; they are also available on an MS-DOS
diskette (5.25-inch or 3.5-inch) for $100.00, this including a
facility for extracting individual orbits and computing ephemerides.
Checks accompanying orders (or in cases where there is insufficient
credit in the accounts for these Circulars) should be made out to
"Central Bureau for Astronomical Telegrams" and mailed to the
postal address given above.
1993 May 17 (5792) Daniel W. E. Green
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