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IAUC 3601: 1981d; N CrA 1981

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IAUC number 

                                                  Circular No. 3601
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 (1981d)
     A. C. Gilmore and P. M. Kilmartin, Mt. John University Observatory,
provide the following precise positions:

     1981 UT             R. A. (1950) Decl.           m1
     Apr. 30.57497     15 09 08.57  - 6 03 54.5       16
          30.59658     15 09 03.01  - 6 03 41.8
     May   1.57328     15 04 56.07  - 5 53 41.4       16
           1.58611     15 04 52.75  - 5 53 34.0

     The following parabolic orbital elements, by B. G. Marsden,
satisfy the available positions (with the time of the second observation
on IAUC 3599 changed to Apr. 28.37778 UT) within 1":

     T = 1981 July 27.087 ET   Peri. = 188.231
                               Node  =  23.439   1950.0
     q = 2.47909 AU            Incl. = 160.744

     1981 ET     R. A. (1950) Decl.     Delta     r      m1
     Apr. 26    15 27.86    - 6 49.1    1.704   2.673   16.4
     May   1    15 07.36    - 5 59.6
           6    14 45.94    - 5 07.4    1.638   2.635   16.3
          11    14 24.26    - 4 14.4
          16    14 03.03    - 3 23.1    1.654   2.600   16.2
          21    13 42.87    - 2 35.7
          26    13 24.23    - 1 53.7    1.746   2.570   16.3
          31    13 07.40    - 1 18.2
     June  5    12 52.51    - 0 49.6    1.898   2.543   16.4

                  m1 = 11.0 + 5 log Delta + 10 log r


NOVA CORONAE AUSTRINAE 1981
     N. Brosch, University of Leiden, telexes: "The Balmer decrement
of Nova CrA 1981 measured at the Wise Observatory on Apr.
10.07 UT (cf. IAUC 3596) implies reddening of A(V) = 1.7 mag.  The
similarity of the spectrum to that of V1500 Cyg, the rapidity of
the decline (2 mag in 8 days) and the outburst excursion range
(more than 12 mag) imply an absolute magnitude at maximum of about
-10.  Thus the distance to the object is 11.5 kpc.  The galactic
latitude of -14o.6 implies z = -3 kpc.  Thus the nova probably occurred
in the galactic bulge itself."


1981 May 4                     (3601)              Brian G. Marsden

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