Central Bureau for Astronomical Telegrams
IAUC 4167: 1986a; 1982i
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Circular No. 4167
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 SHOEMAKER 3 (1986a)
Ephemeris from the orbital elements on IAUC 4166:
1985/86 ET R.A. (1950.0) Decl. p r m1
Dec. 21 9 21.24 +18 54.5 0.980 1.792 13.0
31 9 29.58 +19 36.8
Jan. 10 9 34.48 +20 36.6 0.889 1.805 12.8
20 9 36.08 +21 48.2
30 9 35.11 +23 01.4 0.869 1.843 12.9
Feb. 9 9 32.69 +24 04.8
19 9 30.25 +24 48.6 0.934 1.904 13.1
Mar. 1 9 29.09 +25 07.6
11 9 30.02 +25 01.6 1.083 1.986 13.7
21 9 33.41 +24 32.9
31 9 39.19 +23 45.4 1.303 2.083 14.3
Total visual magnitude estimate by C. S. Morris, near Mt.
Wilson, CA (0.25-m reflector): Jan. 18.38 UT, 13.0.
PERIODIC COMET HALLEY (1982i)
M. C. Pande, Uttar Pradesh State Observatory, reports further
tentative identifications (cf. IAUC 4149) of emission features,
observed by P. S. Goraya, B. S. Rautela and B. B. Sanwal with the
1-m Naini Tal reflector and spectrum scanner (0.9-nm resolution,
range 300-700 nm) during 1985 Nov. 25.6, 26.6, 27.6, 29.6, 30.6,
Dec. 3.6, 5.6, 18.6 and 19.5 UT: NH (0-0) 336-nm, CN (1-0) 358-nm,
CN (0-0) 388-nm, CH (0-0) + C3 405-nm, CN (0-1) 420-nm, C2 (2-0) +
CH (0-0) 435-nm, C2 (1-0) 470-nm, C3 (0-0) 516-nm, C2 (0-1) 564-
nm, C2 (0-2) 619-nm. Very weak emission features of NH2 (9-0)
570-nm, [O I] + NH2 (8-0) 630-nm and NH2 (7-0) 662-nm were also
suspected. Weak NH features were continuously gaining strength.
The continuum had become very weak by Dec. 18 and 19, and all the
emission bands except C3 had strengthened. The relative intensity
of CN and C3 displayed remarkable fluctuations. On Nov. 25 all
the C2 emission bands weakened, and CN (0-0) became very faint
compared to C3. CN (0-0) and C3 emissions were comparable in Nov.,
whereas C3 was much weaker than CN (0-0) on Dec. 18 and 19.
Total visual magnitude estimates: Jan. 14.97 UT, 4.2 (J. E.
Bortle, Stormville, NY, 10 x 50 binoculars); 16.96, 4.2 (Bortle);
18.10, 4.1 (C. S. Morris, Lake Hughes, CA, 20 x 80 binoculars).
1986 January 21 (4167) Brian G. Marsden
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