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IAUC 5339: 1991w; N Sct 1991

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IAUC number 

                                                  Circular No. 5339
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


COMET McNAUGHT-RUSSELL (1991w)
     The following precise positions have been reported:

     1991 UT             R.A. (1950) Decl.        m1    Observer
     Sept. 5.55454   21 54 24.79   - 2 09 36.9          McNaught
           6.55718   21 53 53.12   - 2 17 57.9            "
           7.63473   21 53 19.22   - 2 26 55.1    18    Seki
           7.64827   21 53 18.77   - 2 27 00.9            "
           8.60880   21 52 48.86   - 2 35 01.9          McNaught

R. H. McNaught (Siding Spring).  Uppsala Southern Schmidt.  Film dark
   on Sept. 6.
T. Seki (Geisei).  0.6-m reflector.

     The following parabolic orbital elements, from the nine available
observations Sept. 3-8, are rather uncertain, but they suggest that
this comet may have a near-record large perihelion distance:

     T = 1991 Jan. 12.975 ET          Peri. = 154.056
                                      Node  = 149.352   1950.0
     q = 7.11258 AU                   Incl. = 104.876

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Sept. 1    21 56.85    - 1 31.7    6.277    7.266    17.6
          11    21 51.59    - 2 54.9
          21    21 46.79    - 4 16.8    6.412    7.294    17.7
     Oct.  1    21 42.64    - 5 35.5
          11    21 39.28    - 6 49.2    6.667    7.323    17.8
          21    21 36.84    - 7 56.8
          31    21 35.34    - 8 57.6    7.009    7.355    17.9
     Nov. 10    21 34.79    - 9 51.2
          20    21 35.16    -10 37.6    7.390    7.388    18.0


NOVA SCUTI 1991
     Further visual magnitude estimates: Sept. 3.85 UT, 12.1 (P. Schmeer,
Bischmisheim, Germany); 4.88, 13.0 (A. Boattini, Florence, Italy);
5.47, 12.6 (P. Camilleri, Cobram, Victoria, Australia); 5.85, 13.1 (M.
Tombelli, Montelupo, Italy); 6.41, 12.5 (A. F. A. L. Jones, Nelson,
New Zealand).


1991 September 9               (5339)              Brian G. Marsden

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