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IAUC 5333: 1991v; NOVAE

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IAUC number 

                                                  Circular No. 5333
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 (1991v)
     R. H. McNaught, Anglo-Australian Observatory, reports his
discovery of a comet on a 60-min R exposure by K. S. Russell with the
U.K. Schmidt on Aug. 30.  Subsequently he also found it on an Aug. 3
plate, and altogether he has measured the following precise positions:

     1991 UT             R.A. (1950) Decl.        m1    Observer
     Aug.  3.54744   20 20 34.25   -47 53 47.1   16.5   Hartley
           3.59258   20 20 30.23   -47 54 24.0            "
          30.43910   19 39 41.28   -52 47 13.7   17.5   Russell
          30.48076   19 39 37.62   -52 47 33.0            "
     Sept. 1.48731   19 36 53.62   -53 02 05.2   16.5     "

M. Hartley (Siding Spring).  Very strong condensation 1" across; tail
   1'.5 long in p.a. 0 deg.
K. S. Russell (Siding Spring).  Aug. 30: strong condensation 3"
   across; tail 0'.5 long in p.a. 20 deg.  Sept. 1: excellent dense
   image on 4415 film; tail 1'.0 in p.a. 25 deg.

     Parabolic orbital elements from the above observations:

     T = 1992 Apr. 24.445 ET          Peri. = 253.599
                                      Node  = 120.155   1950.0
     q = 3.32276 AU                   Incl. =  91.576

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Sept. 1    19 37.55    -52 58.6    3.342    3.982    16.6
          11    19 25.25    -53 59.4
          21    19 15.81    -54 42.5    3.528    3.885    16.6
     Oct.  1    19 09.57    -55 13.4
          11    19 06.63    -55 36.8    3.742    3.794    16.7


NOVAE
     A. C. Gilmore, Mount John Observatory, provides the following
photoelectric photometry, obtained in rather marginal conditions
(volcanic dust, weak aurora): Nova Cen 1991, Aug. 30.41 UT, V = 14.25
+/- 0.09, B-V = +1.3 +/- 0.1 (mean of 5 measures); Nova Oph 1991,
Aug. 30.45, V = 14.80 +/- 0.15, B-V = +0.37 +/- 0.04 (3 measures);
Nova Sgr 1991, Aug. 30.54, V = 14.57 +/- 0.09, B-V = -0.5 +/- 0.2
(2 measures; low moon).


1991 September 2               (5333)              Brian G. Marsden

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