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IAUC 5650: GRO J0422+32; 1992t; 1992p

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                                                  Circular No. 5650
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


GRO J0422+32
     T. Mazeh, E. M. Leibowitz, S. Hemar, and H. Mendelson, Wise
Observatory, Tel Aviv University; and R. E. McCrosky, Oak Ridge
Observatory, Harvard-Smithsonian Center for Astrophysics, report:
"The optical counterpart of GRO J0422+32 has been monitored at Wise
and Oak Ridge Observatories on more than 20 nights since Aug. 28,
including CCD B photometry for a few hours each night, with a time
resolution of 4-5 min, showing that the star's average brightness
declined at a rate of about 0.01 mag/day.  So far, more than a
thousand exposures have been analyzed.  On every night, the star
displayed erratic eruptions on timescales of 1-2 hr, with a typical
amplitude of 0.1 mag.  This variation is reflected in the power
spectrum of the whole data set through a QPO-like feature at
frequencies close to 0.5 hrE-1.  The power spectrum also reveals a
power-law rise toward the low-frequency end of the spectrum.  We
find no evidence for 4.5- or 5-hr stable periodicity in our data."


PERIODIC COMET SWIFT-TUTTLE (1992t)
     G. P. Tozzi and G. Calamai, Osservatorio Astronomico Arcetri,
Florence, report the following magnitudes obtained with the Italian
National Infrared Telescope TIRGO (28" diaphragm), showing a sharp
increase in infrared brightness over 24 hr:  Nov. 6.7 UT, J = 8.85
+/- 0.05, H = 8.45 +/- 0.05, K = 8.23 +/- 0.05; Nov. 7.7, 8.25 +/-
0.10, 7.90 +/- 0.10, 7.80 +/- 0.10.


PERIODIC COMET BREWINGTON (1992p)
     Ephemeris extension from orbital elements on MPC 21081:

1992/93     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Nov. 14     9 36.10   +32 36.1   1.990   2.315   96.1   25.1   15.1
     24     9 42.02   +32 31.7   1.937   2.384  104.5   23.6   15.5
Dec.  4     9 44.47   +32 39.7   1.886   2.454  113.6   21.6   16.0
     14     9 43.30   +32 58.1   1.844   2.524  123.4   19.0   16.4
     24     9 38.48   +33 23.0   1.815   2.594  133.8   15.9   16.9
Jan.  3     9 30.32   +33 48.3   1.803   2.665  144.4   12.4   17.3
     13     9 19.54   +34 06.5   1.814   2.735  154.5    8.9   17.8
     23     9 07.27   +34 11.1   1.853   2.806  162.1    6.2   18.3
Feb.  2     8 54.91   +33 58.3   1.920   2.876  162.8    5.8   18.8
     12     8 43.80   +33 27.8   2.016   2.946  156.1    7.8   19.3
     22     8 34.87   +32 42.7   2.140   3.016  146.7   10.4   19.8
Mar.  4     8 28.67   +31 47.0   2.288   3.085  136.7   12.7   20.4
     14     8 25.30   +30 44.9   2.455   3.154  126.9   14.6   20.9
     24     8 24.57   +29 39.5   2.640   3.223  117.4   15.9   21.4

     Total visual magnitudes from H. Mikuz, Ljubljana, Slovenia
(0.2-m reflector):  Sept. 8.13 UT, 11.2; 26.14, 12.3 (CCD); Oct.
9.14, 14.4.


1992 November 10               (5650)            Daniel W. E. Green

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