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IAUC 5343: 1991x; N Her 1991

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IAUC number 

                                                  Circular No. 5343
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 SPACEWATCH (1991x)
     J. V. Scotti, Lunar and Planetary Laboratory, has measured the
following additional precise positions from Spacewatch images obtained
by T. Gehrels and himself at Kitt Peak.  The three values of m2 on
IAUC 5341 should read 21.1, 21.0 and 20.9, respectively.

     1991 UT             R.A. (1950) Decl.        m2
     Sept.10.24296   23 12 42.99   - 9 02 30.2
          10.25603   23 12 42.27   - 9 02 36.4
          10.26464   23 12 41.81   - 9 02 40.3
          12.30550   23 10 56.89   - 9 20 03.1
          12.31586   23 10 56.29   - 9 20 08.1
          12.32566   23 10 55.78   - 9 20 12.8   21.1

     The following parabolic and elliptical orbits satisfy
the 15 observations Sept. 8-12 comparably well, but the ephemeris is
from the ellipse:

     T = 1991 Dec. 8.446 ET           Peri. =  45.403
                                      Node  = 162.993   1950.0
     q = 0.52588 AU                   Incl. =  44.626

     T = 1990 Dec. 18.452 ET          Peri. =  85.867
     e = 0.51223                      Node  = 152.956   1950.0
     q = 1.53500 AU                   Incl. =  10.188
       a =  3.14701 AU     n = 0.176546     P =   5.58 years

     1991 ET      R.A. (1950) Decl.     Delta      r       m2
     Sept. 1    23 20.76    - 7 39.3    1.689    2.687    20.9
          11    23 12.06    - 9 08.9
          21    23 03.92    -10 27.9    1.814    2.797    21.3
     Oct.  1    22 57.15    -11 30.9
          11    22 52.31    -12 15.5    2.046    2.905    21.7


NOVA HERCULIS 1991
     Visual magnitude estimates: June 4.92 UT, 13.9 (S. Korth,
Dusseldorf, Germany; correction to IAUC 5282); 8.32, 14.7 (R. J. Modic,
Richmond Heights, OH); 13.24, 14.8 (Modic); 21.29, 15.1 (Modic); 30.89,
14.7 (A. Boattini, Florence, Italy); July 6.24, 15.1 (Modic); 17.22,
15.7 (Modic); 24.34, 15.1 (Modic); Aug. 2.13, 16.2 (Modic).


1991 September 12              (5343)              Brian G. Marsden

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