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IAUC 6738: V518 Per = GRO J0422+32; C/1997 D1

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                                                 Circular No. 6738
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


V518 PERSEI = GRO J0422+32
     A. Iyudin and F. Haberl, Max-Planck-Institut fur
Extraterrestrische Physik, report:  "V518 Per (= GRO J0422+32) was
again spotted in two mini-outbursts starting on Mar. 24 (3.1 mCrab,
significance > 5.1 sigma) and July 23 (3.3 mCrab, significance >
4.6 sigma).  These mini-outbursts of V518 Per, together with that
reported on IAUC 6605, confirmed the outburst period of about 120
days, suspected on the basis of earlier x-ray and optical
measurements (op.cit.).  The periodical nova outbursts confirm
similarities between V518 Per and the low-mass binary system Aql
X-1 in the timing sequence and in the decrease of the peak-flux
amplitude for the consecutive outbursts.  The flux values during
mini-outbursts were derived under the assumption of a Crab-like
power-law spectrum.  The data were analyzed from the publicly
available ASM quick-look results (op.cit.).  Observations of V518
Per at other wavelengths are strongly encouraged at the times of
the suspected periodical outbursts."


COMET C/1997 D1 (MUELLER)
     Ephemeris extension to IAUC 6626 (orbital elements MPC 30063):

1997 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Aug. 30     8 27.62   +24 59.9   3.067   2.300   34.0   14.2   12.1
Sept. 9     8 27.02   +23 20.2   2.907   2.279   43.1   17.6   11.9
     19     8 24.79   +21 35.0   2.723   2.263   52.8   20.7   11.7
     29     8 20.30   +19 40.9   2.520   2.252   63.2   23.4   11.5
Oct.  9     8 12.69   +17 33.3   2.302   2.248   74.3   25.3   11.3
     19     8 00.77   +15 05.5   2.079   2.249   86.5   26.2   11.1
     29     7 43.05   +12 08.4   1.861   2.257  100.0   25.7   10.9
Nov.  8     7 17.73   + 8 31.5   1.665   2.270  115.1   23.3   10.7
     18     6 43.45   + 4 09.1   1.512   2.288  131.3   18.9   10.5
     28     6 00.69   - 0 45.9   1.427   2.312  146.2   13.7   10.4
Dec.  8     5 13.39   - 5 31.0   1.428   2.342  151.6   11.6   10.5
     18     4 28.15   - 9 15.8   1.518   2.376  142.6   14.6   10.7
     28     3 50.34   -11 39.4   1.681   2.415  128.0   18.7   11.0

     Total visual magnitude estimate by R. J. Bouma, Groningen, The
Netherlands (0.25-m reflector):  Sept. 11.13 UT, 12.6.

                      (C) Copyright 1997 CBAT
1997 September 11              (6738)            Daniel W. E. Green

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