Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 3579: 1981b; 1980 YS

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 3578 SEARCH Read IAUC 3580
IAUC number 

                                                  Circular No. 3579
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758


COMET BUS (1981b)
     S. J. Bus, currently observing with the U.K. Schmidt Telescope
Unit at Siding Spring, provides the following accurate positions,
measured by him from exposures by K. S. Russell:

     1981 UT             R. A. (1950) Decl.        m1
     Mar.  2.60104    11 53 27.48   - 0 09 12.9   17.5
           3.58906    11 52 57.36   - 0 04 30.5

(There was apparently an error in the sign of Decl. originally reported.)
The comet's image consists of a central condensation and a
faint tail, 20" long, to the northwest.


1980 YS
     MPC 5827 contains the discovery observations, by N. G. Thomas,
of a minor planet that was moving slightly direct at opposition.
As a result of computations by E. Bowell and J. G. Williams, further
observations have now been obtained.  The observations are:

     1980/81 UT          R. A. (1950) Decl.       Mag.   Observer
     Dec. 30.22639     6 06 22.41   +30 14 50.6   15.5   Thomas
          30.26042     6 06 22.43   +30 15 03.5            "
     Jan.  3.28681     6 07 24.98   +30 44 06.8          Helin
     Feb. 24.11806     7 20 36.79   +29 39 21.8   17       "
          24.14236     7 20 40.07   +29 39 10.6            "

N. G. Thomas (Lowell Observatory). Measurer: E. Bowell.
E. Helin (Palomar Observatory).  Measurers: J. Gibson and Helin.
   Image involved with that of a star on Jan. 3.

     The orbit computation leads to: T = 1981 Jan. 12, Peri. = 49o, Node =
59o, Incl. = 2o.3, q = 1.23 AU, e = 0.32.  The resulting ephemeris is:

     1981 ET     R. A. (1950) Decl.     Delta     r     Mag.
     Mar.  7     7 46.13    +27 57.4
          17     8 10.24    +26 06.6    0.516   1.347   18.1
          27     8 34.29    +24 03.8
     Apr.  6     8 57.93    +21 52.1    0.669   1.419   18.8
          16     9 21.02    +19 34.2
          26     9 03.46    +17 12.2    0.855   1.500   19.5


1981 March 5                   (3579)              Brian G. Marsden

Read IAUC 3578 SEARCH Read IAUC 3580

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

Valid HTML 4.01!