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IAUC 3920: 1984c; 1983v; 1983n; P/ENCKE

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                                                  Circular No. 3920
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 NEUJMIN 1 (1984c)
     This comet has been recovered by A. C. Gilmore and P. M.
Kilmartin, Mount John University Observatory, as follows:

      1984 UT            R.A.   (1950.0)    Decl.       m2

      Feb. 26.63831     17 05 03.22     -36 16 51.1     18
           26.68414     17 05 07.21     -36 17 05.9

The object is of stellar appearance.  The indicated correction to
the ephemeris (MPC 8156: elements on MPC 7455) is Delta-T = -0.007 +/-
0.001 day.  Southern-hemisphere photoelectric observers are urged
to attempt to determine the rotation period of this object now,
before there is the potential for contamination from coma.


PERIODIC COMET HARTLEY-IRAS (1983v)
     Further total visual magnitude estimates: Feb. 24.51 UT, 7.4
(C. S. Morris, Los Angeles Crest Highway, CA, 10 x 50 binoculars);
25.39, 7.7 (D. W. E. Green, Harvard, MA, 0.20-m reflector; coma
diameter ~ 7'); 27.42, 8.6 (Green, Cambridge, MA, 20 x 80
binoculars; coma diameter ~ 5').


PERIODIC COMET CROMMELIN (1983n)
     Further total visual magnitude estimates: Feb. 8.00 UT, 8.8
(J. Bortle, Stormville, NY, 0.32-m reflector); 8.99, 8.9 (Bortle);
9.77, 9.1 (J.-C. Merlin, Le Creusot, France, 0.26-m reflector);
10.77, 9.0 (Merlin); 11.77, 9.5 (P. Valisa, Varese, Italy, 0.20-m
reflector); 13.77, 8.6 (Merlin); 14.77, 8.5 (Merlin); 17.77, 8.3
(Merlin); 19.10, 8.7 (R. Keen, Boulder, CO, 0.32-m reflector);
20.15, 8.0 (C. S. Morris, Whitaker Peak, CA, 20 x 80 binoculars);
21.10, 8.2 (Keen); 23.02, 8.0 (D. W. E. Green, Harvard, MA, 20 x
80 binoculars); 24.16, 8.1 (Morris); 27.03, 8.0 (Green).


PERIODIC COMET ENCKE
     Total visual magnitude estimates: Feb. 19.14 UT, 9.8 (C. S.
Morris, Whitaker Peak, CA, 0.20-m reflector); 20.14, 9.5 (Morris);
21.09, 9.0 (R. Keen, Boulder, CO, 0.32-m reflector); 23.00, ~ 8.8
(D. W. E. Green, Harvard, MA, 0.20-m reflector); 24.14, 8.6 (
Morris, 20 x 80 binoculars); 27.01, 8.7 (Green).


1984 February 27               (3920)              Brian G. Marsden

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