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IAUC 4931: 1989f1; V635 Cas

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IAUC number 

                                              Circular No. 4931
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 McKENZIE-RUSSELL (1989f1)
     The following additional precise positions have been reported:

     1989 UT             R.A. (1950) Decl.        m1    Observer
     Dec. 26.52894    4 30 11.20   + 1 29 01.3          McNaught
          27.46007    4 24 49.51   + 1 16 02.7            "
          27.50241    4 24 34.91   + 1 15 27.3            "
          27.61331    4 23 57.56   + 1 13 54.9   13     Sugie
          27.62159    4 23 54.80   + 1 13 41.6   13       "

R. H. McNaught (Siding Spring).  Uppsala Southern Schmidt telescope.
A. Sugie (Dynic Astronomical Observatory).  0.25-m f/3.4 Schmidt.

     Preliminary parabolic orbital elements from 5 observations,
Dec. 21-27:

     T = 1989 Nov.  8.425 ET          Peri. = 192.220
                                      Node  = 293.281   1950.0
     q = 1.97928 AU                   Incl. = 160.362

     1989/90      R.A. (1950) Decl.     Delta      r       m1
     Dec. 20     5 11.75    + 3 13.8    1.098    2.043    12.8
          25     4 39.33    + 1 51.4
          30     4 10.99    + 0 43.3    1.233    2.076    13.1
     Jan.  4     3 47.17    - 0 09.2
           9     3 27.68    - 0 47.5    1.451    2.116    13.6
          14     3 11.98    - 1 13.8
          19     2 59.47    - 1 30.7    1.713    2.161    14.0
          24     2 49.58    - 1 40.3
          29     2 41.83    - 1 44.4    1.994    2.212    14.4


V635 CASSIOPEIAE
     H. Mendelson and T. Mazeh, Wise Observatory, report:  "V635 Cas,
the optical counterpart of the x-ray pulsar 4U 0115+63, has gone
into another long-term outburst.  Since 1988 Nov., the star has
continuously brightened from magnitude I = 13.4 to 12.6 (+/- 0.1).
Two of the previous optical outbursts were observed to be
accompanied by an x-ray eruption.  Spectroscopic and x-ray
observations are strongly recommended."


1989 December 27               (4931)             Daniel W. E. Green

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