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IAUC 3004: theta1 Ori A; 1976e

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                                                  Circular No. 3004
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK     Telex: 921428
Telephone: (617) 864-5758


theta1 ORIONIS A
     J. Mattei, American Association of Variable Star Observers,
reports that M. Baldwin has determined the period of this eclipsing
binary to be 65.43 days, one-third of what had previously been
supposed (cf. IAUC 2859, 2881, 2905).  The star was observed in
eclipse on Feb. 9, was suspected of entering eclipse on Apr. 14,
and was observed in eclipse on Aug. 23 and Oct. 27.  No secondary
minima (at phase 0.5, at any rate) have been detected visually.


PERIODIC COMET D'ARREST (1976e)
     Further precise positions have been reported as follows:

     1976 UT             R. A. (1950) Decl.        m1    Observer
     June 21.19207    18 48 22.41   +21 13 47.1          Schwartz
     July  2.58536    19 02 32.14   +22 04 38.7   13     Kurosaki
          23.60035    19 51 42.16   +15 44 10.9            "
          23.60903    19 51 43.84   +15 43 45.8            "
          25.65928    19 59 20.90   +14 07 55.2            "
          25.70521    19 59 31.16   +14 05 31.8          Suzuki
          25.71632    19 59 33.64   +14 04 58.1            "
     Aug. 18.69115    22 20 14.11   -21 24 43.3          Candy
          19.66493    22 27 01.43   -22 55 24.7            "
          19.66910    22 27 02.99   -22 55 47.0          Kojima
          21.67882    22 40 51.81   -25 48 44.8            "
          21.68438    22 40 53.99   -25 49 12.7            "
          31.60660    23 40 42.51   -35 39 48.3    7     Seki

G. Schwartz (Harvard College Observatory, Agassiz Station).  155-cm
   reflector.  Measurer: C. Y. Shao.
T. Kurosaki (Utsunomiya), N. Kojima (Ishiki) and T. Seki (Geisei).
   From Orient. Astron. Assoc. Comet Bull. Nos. 135 and 136.
K. Suzuki (JCPM Oi Station).  From Nihondaira Obs. Circ. No. 798.
M. P. Candy (Perth Observatory, Bickley).  On IAUC 2990, the time
   of the Aug. 17 Perth observation should read Aug. 17.68229 UT.

     Selected total visual magnitude estimates: Oct. 15.12 UT, ~7.6
(J. Bortle, Brooks Observatory, 10 x 50 binoculars); 18.16, 7.3
(Bortle); 23.21, 7.4 (P. Maley, Houston, Texas, 13-cm refractor);
27.16, 7.9 (Bortle); 29.19, 7.7 (C. S. Morris, Boalsburg, Pennsylvania,
20 x 80 binoculars); Nov. 1.19, 7.9 (Maley).


1976 November 5                (3004)              Brian G. Marsden

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