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IAUC 2964: 1975n; 1976e

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                                                  Circular No. 2964
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
Western Union: RAPID SATELLITE CAMBMASS


COMET WEST (1975n)
     Further precise positions have been reported as follows:

     1975/76 UT          R. A. (1950) Decl.        Observer
     Nov.  7.49722    20 17 24.35   -40 55 10.5    Gans
          10.51250    20 17 59.32   -40 39 54.8    Candy
          13.50972    20 18 51.48   -40 24 19.9    Jekabsons
          27.51944    20 26 32.49   -39 06 27.2      "
     Dec. 10.55347    20 38 39.92   -37 46 09.4      "
          28.55278    21 02 46.34   -35 36 14.9    Candy
     Feb. 15.50417    22 59 36.39   -20 42 11.6      "
     Apr.  3.33430    20 46 43.07   +13 55 29.3    Mourao
           3.34461    20 46 41.88   +13 55 32.1      "
           5.33845    20 44 25.11   +14 13 56.8      "
           5.34399    20 44 24.68   +14 13 56.0      "
           6.32949    20 43 16.82   +14 22 53.0      "
           6.34195    20 43 15.93   +14 23 00.6      "
           7.30495    20 42 08.77   +14 31 38.1      "
           7.31360    20 42 08.21   +14 31 44.6      "
           9.31229    20 39 45.52   +14 49 30.6      "
          21.02338    20 24 20.61   +16 22 54.9    Dykes
          26.02022    20 16 34.69   +16 56 51.5    Haddow
     May   1.74372    20 06 37.52   +17 29 35.8    Gilmore
           1.75071    20 06 36.74   +17 29 36.9      "

D. Gans, M. P. Candy and C. Jekabsons (Perth  Observatory).  The Feb.
   15 position corrects that on IAUC 2928.
R. R. de F. Mourao (National Observatory, Rio de Janeiro).  Probably
   nucleus A on Apr. 3-7, nucleus B on Apr. 9.
M. R. Dykes and K. A. Haddow (Woolston Observatory).  Measurer:
   R. L. Waterfield.  Essentially nucleus D.
A. C. Gilmore (Carter Obs.).  Measurer; P. M. Kilmartin.  Nucleus A.

     Further photographic observations of the separations and position
angles of nuclei B and D (relative to nucleus A):

Nucleus B.  May 1.75 UT, 41".3, 302o.1 (Gilmore); 22.40, 49".1, 296o.3
   (S. Murrell and C. Knuckles, New Mexico State University; measured
   by E. J. Reese); 26.40, 49".6, 296o.0 (Murrell); 29.24, 50".6,
   294o.8 (G. Schwartz, Harvard Observatory, Agassiz Station; measured
   by Z. Sekanina); June 1.40, 49".3, 295o.7 (Murrell).

Nucleus D.  May 1.75 UT, 17".7, 311o.3 (Gilmore); 22.40, 21".9, 304o.7
   (Murrell); 26.40, 22".1, 304o.7 (Murrell); 29.24, 22".5, 303o.8
   (Schwartz); June 1.40, 22".5, 304o.3 (Murrell).

     J. Bortle, Brooks Observatory, provides the following visual
magnitude estimates for the condensations (32-cm reflector): May
24.26  UT, A = 14.1, B = 14.7, D = 13.9; 28.27, 13.9, 14.8, 13.9;
June 5.27, 14.1, 14.7-14.8, 14.5.  Total magnitude estimates and
tail information (10 x 50 binoculars): May 24.26, 7.2, 0o.6 in p.a.
268o; 28.27, 7.4, 0o.5 in 260o; June 5.27, 8.0, 0o.5 in 254o.


PERIODIC COMET D'ARREST (1976e)
     The following precise positions have been reported:

     1976 UT             R. A. (1950) Decl.        m2    Observer
     Feb. 25.48368    16 24 07.28   - 3 05 15.8  ~21.5   Roemer
          25.52338    16 24 10.87   - 3 05 05.6            "
     Mar. 25.44230    17 08 06.54   + 0 07 52.7  ~20.6     "
          25.48575    17 08 10.52   + 0 08 19.6            "
     May  25.32014    18 22 42.97   +14 51 41.1            "
          28.39595    18 25 38.12   +15 44 15.0  ~18.0     "
          28.41817    18 25 39.26   +15 44 37.5            "
     June  4.22037    18 31 58.18   +17 35 56.8  ~17.5   Schwartz

E. Roemer (University of Arizona).  Steward Observatory's 229-cm
   reflector on Feb. 25 and Mar. 25 (C. A. Heller assisting) and May
   28 (L. M. Vaughn assisting; sharp, quite stellar nucleus with
   barest trace of coma southward).  Lunar and Planetary Laboratory's
   154-cm reflector on May 25.  Measurer: C. D. Vesely.
G. Schwartz (Harvard Observatory).  155-cm reflector.  Measurer:
   C. Y. Shao.  Strong condensation with very small circular coma.

     The following ephemeris positions are from a new orbit determined
by the undersigned from observations 1970-1976.  For Delta, r
and magnitudes see IAUC 2900 and Sky Telescope (1976) 52, 10.

   1976 ET     R. A. (1950) Decl.    1976 ET     R. A. (1950) Decl.
   June 16    18 43.08    +20 20.2   Aug. 25    23 02.73    -29 53.9
        21    18 48.20    +21 12.2        30    23 32.25    -34 31.3
        26    18 53.83    +21 48.5   Sept. 4    23 56.87    -37 32.6
   July  1    19 00.29    +22 04.6         9     0 16.50    -39 21.7
         6    19 07.93    +21 55.0        14     0 31.63    -40 19.0
        11    19 17.24    +21 12.5        19     0 42.97    -40 38.6
        16    19 28.72    +19 47.3        24     0 51.32    -40 30.1
        21    19 42.98    +17 25.8        29     0 57.42    -39 59.4
        26    20 00.72    +13 50.8   Oct.  4     1 01.91    -39 11.3
        31    20 22.64    + 8 43.5         9     1 05.29    -38 09.2
   Aug.  5    20 49.18    + 1 53.3        14     1 07.93    -36 55.7
        10    21 20.14    - 6 24.7        19     1 10.14    -35 32.9
        15    21 54.29    -15 16.2        24     1 12.17    -34 02.5
        20    22 29.38    -23 24.5        29     1 14.21    -32 26.0


1976 June 17                   (2964)              Brian G. Marsden

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