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IAUC 3128: 1977p; 1977l; 1977o

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                                                  Circular No. 3128
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 SANGUIN (1977p)
     E. Helin, Hale Observatories, communicates the following precise
position, measured by J. Gibson, of a prediscovery image identified
by him on an exposure by S. J. Bus and T. Lauer:

     1977 UT             R. A. (1950) Decl.        m1
     Sept.13.26875    22 05 32.54   + 3 02 30.7   14.5

     The following elliptical elements have been determined by the
undersigned from the six precise positions, Sept. 13 to Oct. 21:

       T = 1977 Sept. 17.688 ET
   Peri. = 162.156                    e =   0.66561
   Node  = 182.253    1950.0          a =   5.41778 AU
   Incl. =  18.657                    n =   0.078158
       q =   1.81167 AU               P =  12.61 years

     1977/78 ET  R. A. (1950) Decl.     Delta     r      m1
     Nov. 13    23 08.11    -11 00.0    1.277   1.903   16.8
          23    23 24.43    -11 05.2
     Dec.  3    23 41.46    -10 42.4    1.533   1.975   17.4
          13    23 58.95    - 9 57.1
          23     0 16.72    - 8 54.7    1.820   2.063   17.9
     Jan.  2     0 34.63    - 7 39.9
          12     0 52.58    - 6 16.3    2.128   2.164   18.5


PERIODIC COMET CHERNYKH (1977l)
     The following precise positions have been reported:

     1977 UT             R. A. (1950) Decl.        m1    Observer
     Sept. 5.65938     0 16 50.56   - 4 23 05.0          Candy
           6.94892     0 16 22.80   - 4 29 43.9   13.6   Mrkos
           6.96322     0 16 22.52   - 4 29 50.4            "
           8.18561     0 15 54.96   - 4 36 05.0          Shao
           9.89449     0 15 14.58   - 4 45 03.6   13.4   Vavrova
           9.91116     0 15 14.22   - 4 45 07.7            "
          12.93396     0 13 57.17   - 5 01 14.1   13.4     "
          12.94993     0 13 56.83   - 5 01 18.3            "
          29.70833     0 05 37.28   - 6 29 55.4          Verveer
      Oct. 4.21042     0 03 19.31   - 6 51 21.9          Giclas
           4.68542     0 03 04.87   - 6 53 23.5          Candy
           5.19306     0 02 49.92   - 6 55 45.4          Giclas
           6.5490      0 02 09.7    - 7 01 36     13     Furuta
          11.47282    23 59 51.25   - 7 21 12.5   12     Seki
          11.54861    23 59 49.11   - 7 21 27.0            "
          11.60764    23 59 47.40   - 7 21 42.6   13     Tsuchiya
          11.62436    23 59 47.04   - 7 21 46.0            "
          12.63958    23 59 20.26   - 7 25 14.6          Candy
          14.53472    23 58 32.48   - 7 31 40.3   13     Urata
          14.54039    23 58 32.44   - 7 31 40.9            "
          15.51319    23 58 09.09   - 7 34 45.0   13       "
          15.52153    23 58 08.72   - 7 34 44.5            "
          17.51076    23 57 23.40   - 7 40 31.3   13       "
          17.52257    23 57 23.03   - 7 40 32.3            "
          17.57292    23 57 21.97   - 7 40 36.0          Candy
          17.60417    23 57 21.20   - 7 40 40.5            "
          18.29528    23 57 06.17   - 7 42 38.2          Giclas

M. P. Candy and A. Verveer (Perth Observatory, Bickley).  The Sept.
   5 position is a remeasurement of that on IAUC 3102.
A. Mrkos and Vavrova (Klet Observatory)
C.-Y. Shao (Harvard College Observatory).  Measurer: J. H. Bulger.
H. L. Giclas (Lowell Observatory).  Measurer: M. L. Kantz.
T. Furuta (Kagiya, Aichi).  Communicated by T. Seki.
T. Seki (Kochi Observatory, Geisei Station).
K. Tsuchiya (JCPM Asahikawa Station).  From Japan Astron. Circ. No.
   121, with times corrected.  Measurer: M. Takeishi
T. Urata (JCPM Yakiimo Station). From Nihondaira Obs. Circ. No. 913.

     The following improved orbital elements, by the undersigned,
are from 83 observations Aug. 19 to Oct. 18:

       T =  1978 Feb. 14.7438 ET
   Peri. =  266.6669                  e =   0.594029
   Node  =  134.1055  1950.0          a =   6.325839 AU
   Incl. =    5.7260                  n =   0.0619479
       q =    2.568104 AU             P =  15.91 years

     Further total visual magnitude estimates by J. Bortle, Brooks
Observatory (32-cm reflector): Oct. 13.06 UT, 12.9; 31.01, 12.7.


PERIODIC COMET SCHUSTER (1977o)
     L. D. Schmadel, Astronomisches Rechen-Institut, provides the
following measurements from plates taken by H.-E. Schuster at the
European Southern Observatory.  The time of the first observation
has been changed (cf. IAUC 3123).

     1977 UT             R. A. (1950) Decl.
     Sept. 6.13507     0 08 11.48   -38 55 33.4
           6.23542     0 08 06.14   -38 56 03.1
           7.13889     0 07 19.90   -39 00 12.8


1977 November 4                (3128)              Brian G. Marsden

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