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IAUC 2737: Occn OF kappa Gem A BY 433 EROS ON 1975 Jan. 24; Cyg X-3; Var X-RAY SOURCE IN NGC 1851

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IAUC number 

                                                  Circular No. 2737
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


OCCULTATION OF kappa GEMINORUM A BY 433 EROS ON 1975 JANUARY 24
     Recent astrometric observations of Eros, extending up to Jan.
6, have been reported by R. S. Harrington, U.S. Naval Observatory,
and by H. L. Giclas, Lowell Observatory.  The track of the occultation
of kappa Gem A on Jan. 24.0 UT is still very uncertain, and any
observer between and even somewhat outside the region of the tracks
predicted on IAUC 2722 and 2735 should be prepared for the possibility
that the event will occur (for up to 0.1 min) at his location.
A new prediction by P. Herget, Cincinnati Observatory, gives
the following track:

     UT     Long.  Lat.    UT     Long.  Lat.    UT     Long.  Lat.
   0h18.0  +79o8 +50o0   0h20m9  +68o6 +42.0   0h31m4  +59o8 +10o0
   0 18.8  +76.0 +48.0   0 21.6  +66.9 +40.0   0 34.3  +61.3   0.0
   0 19.5  +73.0 +46.0   0 25.0  +61.8 +30.0   0 36.8  +64.4 -10.0
   0 20.2  +70.6 +44.0   0 28.3  +59.8 +20.0   0 38.9  +69.6 -20.0

For each latitude Lat. it is possible to construct a longitude Long. from
the values given on IAUC 2722 and 2735 by means of the expression
Long. = x Long._2735 + (1 - x) Long._2722.  The new prediction above by Dr.
Herget thus corresponds to x = 0.27.  On the other hand, a new
prediction by the undersigned gives x = 0.59; and by increasing the
weights of the recent observations of Eros we obtained x = 0.97,
i.e., a result that is practically identical with the prediction on
IAUC 2735.  A further adjustment suggested the value x = 1.13,
which puts the track even farther to the west (through the points
Long. = +84o.7, Lat. = +50o.0; +76o.6, +46o.0; +71o.7, +42o.0; +61o.6, +10o.0;
+71o.8, -20o.0). Further high-quality astrometry is still useful.


CYGNUS X-3
     Sir Martin Ryle, The Astronomer Royal, reports that observations
at the Mullard Radio Astronomy Observatory show that yet another
outburst has occurred (cf. IAUC 2734).  At 5 GHz the flux
density was 3.9 Jy on Jan. 8 and 5.5 Jy on Jan. 9.


VARIABLE X-RAY SOURCE IN NGC 1851
     Corrigendum: On IAUC 2735, the galactic coordinates of this
source (now designated MX 0513-40) should read l = 244o, b = -35o.


1975 January 13                (2737)              Brian G. Marsden

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