Central Bureau for Astronomical Telegrams
IAUC 5745: 1993e
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Circular No. 5745
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)
COMET SHOEMAKER-LEVY (1993e)
Perturbed ephemeris, based on the elements on IAUC 5744:
1993 TT R. A. (2000) Decl. Delta r Elong. Phase m1
Feb. 22 12 39.50 - 5 15.5 4.562 5.379 142.3 6.5 13.6
Mar. 4 12 35.92 - 4 56.6 4.471 5.376 153.3 4.8 13.6
14 12 31.60 - 4 32.4 4.408 5.373 164.4 2.8 13.5
24 12 26.83 - 4 04.6 4.375 5.369 175.6 0.8 13.5
Apr. 3 12 21.94 - 3 35.3 4.372 5.366 173.0 1.3 13.5
13 12 17.28 - 3 06.8 4.400 5.363 162.0 3.3 13.5
23 12 13.16 - 2 40.9 4.457 5.360 151.1 5.2 13.5
May 3 12 09.84 - 2 19.7 4.540 5.357 140.5 6.9 13.6
13 12 07.51 - 2 04.3 4.645 5.354 130.2 8.3 13.6
23 12 06.28 - 1 55.6 4.769 5.350 120.2 9.4 13.7
June 2 12 06.20 - 1 54.0 4.906 5.347 110.6 10.2 13.7
The reported positions of the comet refer to
the center of the train (or bar). As noted on IAUC 5730, the
brightest nuclei are displaced to the west-southwest. The Hawaiian
observations seem to show a very close pair of nuclei there, and it
does not necessarily follow that this is the comet's center of mass.
J. V. Scotti, Lunar and Planetary Laboratory, reports that Spacewatch
observations on Mar. 28.24 UT showed 11 nuclei, essentially along
p.a. 76-256 deg. On the western side of the center nuclei were
measured at distances 25".4, 20".9, 16".7, 13".4, 8".8 (the brightest,
estimated at m2 = 20.2) and 1".4 from the center. On the eastern side
the nuclei were at distances 3".2, 9".4, 13".7, 19".7 and 27".0.
A tail extended about 1' from the train as a whole, and a brighter
component of the tail extended 1'.21 in p.a. 285 deg from the brightest
nucleus. A dust trail extended at least 4'.37 in p.a. 258 deg from
the midpoint of the train. A second dust trail extended 3'.96 in p.a.
72 deg. The brighter nuclei were also detected in the Mar. 26.30
record (cf. IAUC 5725); these were measured at 20".6 and 9".7 (the
brightest) and 0".7 to the west of center and at 11".7 and 20".7 to
the east. E. M. Shoemaker reports that three of the nuclei are
also detectable in enlargements of the discovery films: the
Mar. 24.43 exposure shows enhancements at 19".1, 12".6 (the brightest)
and 5".5 on the western side of center.
Total visual magnitude estimates: Mar. 28.39 UT, 13.3 (A. Hale,
Las Cruces, NM, 0.41-m reflector); 30.39, 12.1 (D. H. Levy, Tucson, AZ,
0.40-m reflector); 31.38, 12.3 (Levy); 31.40, 13.4 (Hale).
1993 April 3 (5745) Brian G. Marsden
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