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IAUC 3083: 1977i; 1977b; HM Sge

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IAUC number 

                                                  Circular No. 3083
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


PERIODIC COMET TEMPEL 1 (1977i)
     This comet has been recovered on exposures obtained by C.-Y.
Shao, G. Schwartz and R. E. McCrosky with the 155-cm reflector at
Harvard College Observatory's Agassiz Station.  Conditions were
good, particularly on Apr. 17, when the comet's image was quite
weak and somewhat diffuse.  Measurer: Shao.

     1977 UT             R. A. (1950) Decl.        m2    Observer
     Apr. 12.07322     7 56 53.20   +31 41 14.2          Shao
          17.07012     7 59 45.54   +31 20 47.4  ~20.4   Schwartz
          18.13650     8 00 26.79   +31 16 12.7          McCrosky

The position is in very close agreement with the prediction by
B. G. Marsden on IAUC 3015.  A very similar prediction has been
received from G. Schrutka, Vienna University Observatory.


PERIODIC COMET GRIGG-SKJELLERUP (1977b)
     The following precise positions have been reported:

     1977 UT             R. A. (1950) Decl.        m1   m2  Observer
     Apr. 22.72917    20 27 07.09   +10 38 34.1             Gilmore
          22.74200    20 27 07.94   + 1 39 45.9        12.9   "
     May  20.68125    20 46 00.13   +25 37 57.2    15       Furuta

A. C. Gilmore (Carter Observatory).  Measurer: P. M. Kilmartin.
T. Furuta (Tokai).  From Orient. Astron. Assoc. Comet Bull. No. 148.

     J. Bortle, Brooks Observatory, provides total visual magnitude
estimates and coma diameters (32-cm reflector): May 12.27 UT, 11.0,
2'.3; 13.31, 11.0, 2'.7; 14.33, 11.0, ~ 3'; 23.31, [11.5.


HM SAGITTAE
     Amplifying the note on IAUC 3081, P. A. Feldman, Herzberg
Institute of Astrophysics, points out that the May 9 observation had
been centered on the position originally reported by Dokuchaeva et
al. (IAUC 2995), which is more than 1' east-northeast of Shao's
accurate position.  There is thus no reason to believe the flux
density of the source increased between May 9 and 17, and the source
was again observed at 42 +/- 4 mJy on May 19.3 UT.  However, the
source does seem to have emerged (at 10.5 GHz) since last November.


1977 June 16                   (3083)              Brian G. Marsden

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