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IAUC 3450: GK Per; 1980 AA; 1979l

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IAUC number 

                                                  Circular No. 3450
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


GK PERSEI
     J. E. Nelson, Lawrence Livermore Laboratory, communicates:
"The imaging proportional counter on the Einstein Observatory will
be used to monitor the x-ray cataclysmic variable GK Per on 1980
Feb. 14, 15 and 16 UT for three hours each night.  Interested
optical and infrared observers should telephone F. A. Cordova
(505-667-3904) or myself (415-486-5913) for details."


1980 AA
     A. W. Harris, Jet Propulsion Laboratory, informs us that his
photometric observations with the 1.5-m reflector at Mt. Wilson
show that the rotation period of this object is 2.70 +/- 0.01 hours,
the second shortest value found for any minor planet.  On Jan. 25.3
UT he obtained V (mean) = 14.08, B-V = +0.81 +/- 0.02, U-B = +0.37 +/-
0.05.  The full amplitude in V was 0.10 mag.  Observations were
also made on Jan. 24.  The resulting B(1,0) = 20.1.


COMET BRADFIELD (1979l)
     R. M. West and G. F. O. Schnur, European Southern Observatory,
report that a series of short exposures with the 3.6-m reflector
show a faint nuclear condensation, ~ 1" (150 km) in diameter.  On
Jan. 23.3 UT a faint, straight tail was also seen, together with
some features (streamers?) near the nucleus.  By Jan. 24.1 UT the
tail had become rquch broader and showed internal structure.

     The following UBV photometric observations were made by H. J.
Schober with the Bochum 0.61-m telescope at the European Southern
Observatory, using a diaphragm of 45" centered on the nucleus;
integration times were 10-30 s.  Jan. 23.354 UT, V = 9.39 +/- 0.02,
B-V = +0.39 +/- 0.02, U-B = -0.18 +/- 0.03; 24.111, 9.49 +/- 0.04, +0.37
+/- 0.04, -0.26 +/- 0.04; 25.083, 9.50 +/- 0.03, +0.36 +/- 0.03, -0.14 +/-
0.05.

     Selected visual observations: Jan. 25.83 UT, m1 = 4.7, coma
diameter D = 15' (J. C. Bennett, Pretoria, 0.12-m refractor); 27.04,
4.0, 25' (P. Maley, Houston, 7 x 50 binoculars); 28.02, 4.7, 12'
(C. S. Morris, Harvard, MA, 20 x 80 binoculars); 28.96, 6.0, 20'
(S. O'Meara and P. Collins, Cambridge, MA, 11 x 80 binoculars; some
tail/streamer activity, 0.23-m refractor); 29.75, 5.5, 15' (5.
Baroni, M. Cavagna and G. Clerici, Milan, 15 x 80 binoculars).


1980 January 30                (3450)              Brian G. Marsden

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