Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 3012: 1936 CA (ADONIS); 1976 UA; 1975n

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).


Read IAUC 3011  SEARCH Read IAUC 3013
IAUC number


                                                  Circular No. 3012
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


1936 CA (ADONIS)
     The following prediction, by B. G. Marsden, is based on 24
observations 1936 Feb. 12 to Apr. 11, perturbations by all nine
planets being taken into account.  The search ephemerides cover the
anticipated uncertainty in T (see also Minor Planet Circ. No. 4012).
If Delta-T = +12d there will be (as in l936) a very close approach to
the earth on Feb. 8.

       T = 1976 Dec. 12.9484 ET   Epoch = 1977 Jan. 17.0 ET
   Peri. =  40.4234                   e =   0.764162
   Node  = 351.8333   1950.0          a =   1.872618 AU
   Incl. =   1.3609                   n =   0.3846186
       q =   0.441635 AU              P =   2.563 years

      (1950)  R.A.    Decl. mpg  R.A.    Decl. mpg  R.A.    Decl. mpg

   1977 ET    Delta-T = -16 d    Delta-T = -12 d    Delta-T = -8 d
   Jan. 17    13 53  -10.0  20   14 10  -11.2  20   14 37  -13.0  20
        22    13 39  - 8.8       13 50  - 9.5       14 09  -10.8
        27    13 24  - 7.5  20   13 30  - 7.8  20   13 42  - 8.4  19
   Feb.  1    13 08  - 6.0       13 10  - 5.9       13 15  - 6.0
         6    12 51  - 4.3  20   12 49  - 3.9  20   12 48  - 3.4  19
        11    12 33  - 2.6       12 28  - 1.8       12 22  - 0.9
        16    12 15  - 0.8  20   12 08  + 0.2  20   11 58  + 1.5  19
        21    11 58  + 1.0       11 48  + 2.2       11 36  + 3.7
        26    11 41  + 2.7  20   11 30  + 4.0  20   11 16  + 5.6  20
   Mar.  3    11 25  + 4.2       11 13  + 5.5       11 00  + 7.1
         8    11 11  + 5.5  20   11 00  + 6.9  20   10 46  + 8.4  20

   1977 ET    Delta-T = -4 d     Delta-T = 0 d      Delta-T = +4 d
   Jan. 27    14 03  - 9.7  19   14 44  -11.9  18   16 13  -15.7  18
   Feb.  1    13 24  - 6.2       13 44  - 7.0       14 34  - 9.1
         6    12 48  - 2.8  19   12 50  - 2.1  18   12 58  - 0.9  17
        11    12 15  + 0.4       12 05  + 2.2       11 48  + 5.3
        16    11 46  + 3.2  19   11 29  + 5.6  18   11 02  + 9.1  18
        21    11 21  + 5.6       11 01  + 8.0       10 32  +11.4
        26    11 00  + 7.5  19   10 39  + 9.8  19   10 12  +12.7  18
   Mar.  3    10 43  + 8.9       10 23  +11.1        9 59  +13.5
         8    10 30  +10.0  20   10 12  +11.9  20    9 50  +14.0  20

   1977 ET    Delta-T = +8 d     Delta-T = +12 d    Delta-T = +16 d
   Feb.  6    13 38  + 2.3  16  (21 34  +10.3  16)  23 28  + 4.0  18
        11    11 12  +12.4        8 12  +36.2        2 08  +23.0
        16    10 16  +15.0  16    8 37  +24.6  16    5 33  +29.9  17
        21     9 50  +15.9        8 43  +21.7        7 03  +26.6
        26     9 36  +16.2  18    8 47  +20.3  18    7 41  +24.0  18
    Mar. 3     9 28  +16.3        8 50  +19.4        8 03  +22.3
         8     9 24  +16.3  19    8 53  +18.7  19    8 17  +21.1  19
        13     9 22  +16.2        8 56  +18.2        8 27  +20.2
        18     9 21  +16.1  20    9 00  +17.7  20    8 36  +19.4  20


1976 UA
     Further precise positions have been reported as follows:

     1976 UT             R. A. (1950) Decl.        Observer
     Oct. 28.10184     0 09 40.54   - 1 52 12.5    West
          28.10877     0 09 41.06   - 1 52 34.0      "
          28.31944     0 10 03.33   - 2 05 54.4    Roemer
          28.33750     0 10 04.95   - 2 06 47.9      "
          29.23763     0 11 47.66   - 2 44 13.9    West
          29.24594     0 11 48.24   - 2 44 32.7      "
          29.36204     0 12 08.71   - 2 48 54.0    Gilmore
          29.40512     0 12 12.04   - 2 50 28.9      "
          30.18018     0 13 20.78   - 3 17 26.9    West
          30.20598     0 13 22.16   - 3 18 13.8      "
          30.32431     0 13 32.50   - 3 23 51.0    Roemer
          30.34792     0 13 33.94   - 3 24 32.3      "
          31.07219     0 14 39.58   - 3 42 49.5    West
          31.07911     0 14 39.93   - 3 42 58.1      "
     Nov.  1.09854     0 15 53.99   - 4 06 24.9      "
           1.10408     0 15 54.18   - 4 06 32.0      "
          11.04977     0 24 35.20   - 5 31 48.0    Schuster
          12.02419     0 25 20.68   - 5 33 03.0      "

R. M. West and H.-E. Schuster (European Southern Observatory).
E. Roemer (Lunar and Planetary Laboratory).  Measurer: C. D. Vesely.
   Image elongated on first Oct. 28 exposure.  154-cm reflector.
A. C. Gilmore and P. M. Kilmartin (Carter Observatory).


COMET WEST (1975n)
     The following positions of nucleus A have been measured by
C. Y. Shao from exposures by G. Schwartz with the 155-cm reflector
at Harvard Observatory's Agassiz Station.  The separation and position
angle of nucleus B (relative to A) were: May 29, 50".7, 295o;
Sept. 25, 33".2, 334o.  Those of nucleus D (also relative to A) were:
May 29, 22".8, 304o; Sept. 25, 17".6, 338o.

     1976 UT             R. A. (1950) Decl.
     May  29.23861    19 04 45.52   +17 36 46.0
     Sept.25.02014    17 24 48.36   - 4 38 32.0


1976 December 1                (3012)              Brian G. Marsden

Read IAUC 3011  SEARCH Read IAUC 3013


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!