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IAUC 6740: USNO 1425.09823278; V518 Per; C/1997 J1

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                                                 Circular No. 6740
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)


USNO 1425.09823278
     T. Vanmunster, Landen, Belgium, reports that unfiltered CCD
observations during a 7.8-hr run on Sept. 10-11 with a 0.25-m
telescope reveal superhumps in this system (cf. IAUC 6731), with a
mean semiamplitude of 0.05 mag, hence classifying it as an SU UMa-
type dwarf nova.  A period analysis using the phase dispersion
minimization method yields a superhump period of 0.0561 +/- 0.0004
day.
     Visual magnitude estimate by K. Sarneczky, Raktanya, Hungary:
Sept. 5.852 UT, 13.8.


V518 PERSEI
     A. Guarnieri, C. Bartolini, N. Masetti, and A. Piccioni,
University of Bologna, communicate:  "The analysis of one CCD image
of V518 Per obtained with the Bologna University 1.5-m telescope (+
BFOSC) in the Cousins R band on Jan. 16.85 UT, during an x-ray
mini-outburst (IAUC 6605), shows the object at R_c = 20.7 +/- 0.1.
This is at least 0.4 mag brighter than the quiescent R_c value
reported by Chevalier and Ilovaisky (1996, A.Ap. 312, 105) and
indicates that the periodic x-ray activity of the system (IAUC 6738)
is also present in the optical."


COMET C/1997 J1 (MUELLER)
     Ephemeris extension to IAUC 6672 (orbital elements MPC 30428):

1997 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Aug. 30     9 28.62   +40 00.5   3.426   2.652   34.2   12.4   13.4
Sept. 9     9 30.21   +38 53.0   3.395   2.708   40.4   14.0   13.5
     19     9 30.78   +37 57.8   3.339   2.766   47.8   15.6   13.5
     29     9 30.01   +37 14.5   3.260   2.827   56.1   17.1   13.6
Oct.  9     9 27.47   +36 43.4   3.162   2.890   65.3   18.3   13.6
     19     9 22.68   +36 23.9   3.049   2.955   75.2   19.0   13.6
     29     9 15.11   +36 15.0   2.927   3.022   85.9   19.1   13.6
Nov.  8     9 04.13   +36 14.6   2.802   3.091   97.5   18.5   13.6
     18     8 49.21   +36 18.1   2.685   3.161  109.9   17.1   13.6
     28     8 30.02   +36 18.6   2.584   3.233  123.3   14.8   13.7
Dec.  8     8 06.76   +36 06.5   2.513   3.306  137.4   11.6   13.7
     18     7 40.49   +35 31.7   2.480   3.380  151.9    7.9   13.8
     28     7 13.06   +34 28.5   2.495   3.454  165.0    4.2   13.9

                      (C) Copyright 1997 CBAT
1997 September 12              (6740)            Daniel W. E. Green

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