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IAUC 4244: 1986l; V1727 Cyg

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IAUC number 

                                                  Circular No. 4244
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 617-495-7244/7440/7444


COMET WILSON (1986l)
     The following ephemerides are from the elements on IAUC 4243.
The 1987 ephemeris is only for preliminary planning purposes and
could be substantially in error.

     1986 ET     R.A. (1950.0) Decl.      p        r       m1

     Aug.  8    22 17.61    +24 56.2
          18    21 58.70    +23 37.7    2.658    3.518    11.1
          28    21 37.89    +21 36.7
     Sept. 7    21 16.44    +18 53.6    2.437    3.307    10.6
          17    20 55.85    +15 36.5
          27    20 37.37    +11 59.4    2.397    3.093    10.3
     Oct.  7    20 21.85    + 8 17.9
          17    20 09.66    + 4 45.2    2.501    2.877    10.1

     1987 ET     R.A. (1950.0) Decl.      p        r       m1

     Mar.  6    20 36.71    -23 35.9    2.051    1.426     6.6
          16    20 44.23    -26 51.2
          26    20 53.04    -31 27.4    1.504    1.297     5.5
     Apr.  5    21 04.89    -38 30.3
          15    21 26.00    -50 16.9    0.921    1.230     4.2
          25    22 41.5     -70 26.8
     May   5     6 40.0     -70 48.3    0.631    1.240     3.4
          15     8 09.26    -43 20.5
          25     8 32.03    -26 33.3    1.034    1.323     4.8
     June  4     8 44.54    -17 09.5
          14     8 53.74    -11 31.3    1.638    1.464     6.2
          24     9 01.53    - 7 53.7
     July  4     9 08.60    - 5 27.0    2.202    1.642     7.4


V1727 CYGNI
     D. Crampton, Dominion Astrophysical Observatory, reports:
"The x-ray source V1727 Cyg = 2129+470, which usually varies over
V = 16.3-17.7 with a 5.2-hr period, was observed to be constant at
mag ~ 18, slightly fainter than the star 17" to the west, on several
occasions during the nights of Aug. 2, 3 and 6 UT.  This source
resembles HZ Her = Her X-1 in several respects and is presumably
currently in a low x-ray state.  Photometric and x-ray
observations would be interesting."


1986 August 11                 (4244)              Brian G. Marsden

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