IAU Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 5361: 1991z; 1991p

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 5360  SEARCH Read IAUC 5362
IAUC number


                                                  Circular No. 5361
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


PERIODIC COMET SHOEMAKER-LEVY 5 (1991z)
     The following precise positions have been reported:

     1991 UT             R.A. (1950) Decl.       Observer
     Oct.  5.17350    0 21 16.56   - 7 17 26.7   McCrosky
           5.18052    0 21 16.25   - 7 17 24.8     "
           5.54896    0 20 58.12   - 7 15 37.5   McNaught

R. E. McCrosky and C.-Y. Shao (Oak Ridge).  1.55-m reflector + CCD.
R. H. McNaught (Siding Spring).  Uppsala Southern Schmidt telescope.

     The following preliminary orbital elements, from the five
available observations, indicate that this is a short-period comet:

     T = 1991 Dec.  1.533 ET          Peri. =   0.430
     e = 0.48700                      Node  =  30.062   1950.0
     q = 1.96464 AU                   Incl. =  11.057
       a =  3.82974 AU     n = 0.131507     P =   7.49 years

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Oct.  1     0 24.71    - 7 34.0    1.040    2.033    16.2
           6     0 20.60    - 7 13.7
          11     0 16.63    - 6 48.8    1.038    2.013    16.1
          16     0 12.98    - 6 19.1
          21     0 09.82    - 5 44.6    1.058    1.996    16.1
          26     0 07.27    - 5 05.4
          31     0 05.44    - 4 21.9    1.099    1.983    16.2

     E. Bowell, Lowell Observatory, reports that unflattened R-band
CCD frames of 5-min exposure taken by B. A. Skiff on Oct. 5 with the
1.1-m Hall reflector show that the comet exhibits a coma extending
only 15" from the nucleus, which is very strongly condensed, most of
the light being within 5" of the photocenter (m1 about 16.0-16.5).


PERIODIC COMET SHOEMAKER 1 (1991p)
     Total visual magnitude estimate by C. S. Morris, Lockwood
Valley, CA (0.51-m reflector): Oct. 6.18 UT, 14.1.


1991 October 7                 (5361)             Daniel W. E. Green

Read IAUC 5360  SEARCH Read IAUC 5362


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


Valid HTML 4.01!