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IAUC 2781: X Per; JUPITER XIII

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                                                  Circular No. 2781
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


X PERSEI
     B. Margon and S. Bowyer, Space Sciences Laboratory, University
of California at Berkeley, report: "Extensive photoelectric observations
of X Per during January from the Lick and Leuscher Observatories
yield V = 6.722 +/- 0.005, B-V = 0.13 +/- 0.01, in rough agreement
with the photographic magnitudes from patrol plates reported
by Gottlieb and Liller (IAUC 2774).  There is no evidence for any
variability on timescales from minutes to days.  These are the
faintest photoelectric magnitudes ever reported for X Per."


JUPITER XIII
     The following ephemeris is from Astron. J. (1975) 80, 460.
dR.A. and dDecl. are the offsets from Jupiter.  The photographic
magnitude of the satellite is close to 21.

     1975/76 ET  R. A. (1950) Decl.    dR.A.   dDecl.  Delta     r
     June 17     1 09.08    + 6 16.9   -3'64   - 6'1   5.273   0.085
          27     1 14.60    + 6 53.0   -3.79   - 2.1   5.143   0.084
     July  7     1 19.45    + 7 23.7   -3.79   + 1.9   5.008   0.084
          17     1 23.54    + 7 48.4   -3.63   + 6.0   4.869   0.082
          27     1 26.77    + 8 06.4   -3.28   + 9.8   4.730   0.080
     Aug.  6     1 29.07    + 8 17.3   -2.73   +13.3   4.592   0.078
          16     1 30.37    + 8 20.4   -1.96   +16.1   4.460   0.075
          26     1 30.63    + 8 15.6   -0.99   +18.1   4.337   0.073
     Sept. 5     1 29.81    + 8 02.6   +0.12   +18.9   4.225   0.070
          15     1 27.91    + 7 41.8   +1.29   +18.2   4.129   0.068
          25     1 25.00    + 7 14.1   +2.38   +15.8   4.051   0.066
     Oct.  5     1 21.19    + 6 41.1   +3.23   +11.6   3.996   0.065
          15     1 16.67    + 6 05.1   +3.71   + 5.8   3.968   0.065
          25     1 11.76    + 5 29.1   +3.74   - 0.9   3.968   0.066
     Nov.  4     1 06.83    + 4 56.0   +3.33   - 7.8   4.001   0.067
          14     1 02.31    + 4 28.8   +2.56   -13.9   4.064   0.069
          24     0 58.59    + 4 09.8   +1.58   -18.7   4.157   0.071
     Dec.  4     0 55.99    + 4 00.3   +0.52   -21.7   4.275   0.074
          14     0 54.69    + 4 00.8   -0.50   -22.8   4.414   0.076
          24     0 54.79    + 4 11.0   -1.40   -22.2   4.568   0.079
     Jan.  3     0 56.28    + 4 30.1   -2.15   -20.3   4.732   0.081
          13     0 59.09    + 4 57.3   -2.74   -17.4   4.900   0.083


1975 May 15                    (2781)              Brian G. Marsden

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