Central Bureau for Astronomical Telegrams
IAUC 3938: 1983n; 1983o
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Read IAUC 3939
Circular No. 3938
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
PERIODIC COMET CROMMELIN (1983n)
M. Festou, Institut d'Astrophysique, Paris, telexes: "The
spectrum obtained on Mar. 30 with IUE shows the customary H I and
OH emissions. A very weak continuum was recorded around 300 nm.
Comparison with comet 1979 X (as observed with IUE on 1980 Jan.
31) shows the continuum of P/Crommelin to be ~ 4 times weaker.
The gas production (8.6 x 10**27 s**-1, vectorial model) was 4.6 times
smaller and the geocentric distance 2.75 times larger. P/Crommelin
was 3.5 times dustier than comet 1979 X at the same heliocentric
distance of 1.03 AU. The only other spectral feature recorded
in P/Crommelin was CS (0-0), although it was just above the
noise level. The q(CS)/q(OH) ratio, 7 x 10**-5, is the lowest
observed so far, 10 times smaller than that of comet 1979 X and 30
times smaller than that of P/Encke on 1980 Nov. 5. This is probably
an indication that CS exhibits a very strong Swings effect."
Total visual magnitude estimates: Mar. 25.18 UT, 8.9 (C. Morris,
Whitaker Peak, CA, 20 x 80 binoculars); 27.03, 9.1 (J. Bortle,
Stormville, NY, 0.32-m reflector); Apr. 2.04, 9.8 (Bortle).
COMET IRAS (1983o)
Ephemeris continuation from the orbital elements on MPC 8672:
1984 ET R.A. (1950.0) Decl. P r m1
Apr. 10 12 55.73 +26 04.8 1.825 2.713 13.1
20 12 32.02 +30 35.0
30 12 11.73 +33 40.7 2.176 2.840 13.7
May 10 11 55.75 +35 38.8
20 11 44.15 +36 48.6 2.632 2.975 14.3
30 11 36.51 +37 26.0
June 9 11 32.27 +37 42.3 3.112 3.117 14.9
19 11 30.80 +37 45.6
29 11 31.57 +37 41.2 3.565 3.264 15.4
July 9 11 34.14 +37 32.9
19 11 38.15 +37 23.4 3.959 3.416 15.8
29 11 43.30 +37 14.7
Aug. 8 11 49.38 +37 08.6 4.277 3.571 16.2
18 11 56.19 +37 06.4
28 12 03.58 +37 09.5 4.508 3.728 16.5
1984 April 12 (3938) Brian G. Marsden
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