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IAUC 7647: NOVALIKE Var IN Sco; C/2001 K5

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                                                  Circular No. 7647
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)
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Phone 617-495-7440/7244/7444 (for emergency use only)


NOVALIKE VARIABLE IN SCORPIUS
     K. Haseda, Toyohasi, Aichi, Japan, reports his discovery of a
novalike variable star on T-Max 400 films taken with a 0.10-m f/4
twin patrol camera.  K. Kadota, Ageo, Saitama, provides the
following position for the variable from Haseda's discovery
photograph:  R.A. = 17h57m06s.98, Decl. = -32o23'05".0 (equinox
2000.0).  H. Yamaoka, Kyushu University, reports that Digital Sky
Survey images show a dim star near this position with red mag about
17.5 and blue mag about 20.  Haseda's patrol films indicate that
the star was fainter than mag 12.0-12.9 (not seen) on 27 dates
spanning 1996 Mar. 26-2001 Apr. 22.744 UT; it was detected on his
films at the following magnitudes during the past month:  May
13.617, 10.5; 17.664, 11.0; 28.624, 10.5; June 15.661, 10.4.  K.
Takamizawa, Saku-machi, Nagano, Japan, reports the following
prediscovery observations on his unfiltered T-Max 400 patrol
films:  Apr. 26.737, [12.9; May 12.643, 10.2; 16.698, 11.2; 20.692,
11.0; 25.660, 10.3.  T. Kato, Kyoto University, adds that Kadota
found no object brighter than mag 14 on a CCD image taken on 2000
Feb. 24.842, and that a search of the 2MASS and MSX5C catalogs has
not revealed any likely counterpart.
     W. Liller, Vina del Mar, Chile, reports that he measured a
broadband V magnitude of 10.68 +/- 0.03 on June 21.150 UT, using
nearby GSC 7382837 (V = 9.87, B-V = +0.44).  A low-dispersion
objective-prism spectrogram recorded with the CCD shows a very
intense red line, presumably H-alpha, that is about 5 times the
brightness of the surrounding continuum.  H-beta appears to be
weakly present, indicating that the star is substantially reddened.


COMET C/2001 K5 (LINEAR)
     Ephemeris extension to IAUC 7634 (elements MPEC 2001-M24):

2001 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
June 30    15 08.26   -19 25.1   5.527   6.249  131.7    7.0   14.2
July 10    15 05.99   -18 19.6   5.619   6.210  121.4    8.0   14.2
     20    15 04.79   -17 20.3   5.728   6.170  111.3    8.8   14.2
     30    15 04.70   -16 27.5   5.848   6.132  101.5    9.3   14.2
Aug.  9    15 05.69   -15 41.4   5.975   6.094   91.9    9.6   14.2
     19    15 07.69   -15 01.6   6.102   6.056   82.6    9.5   14.2
     29    15 10.64   -14 27.5   6.227   6.019   73.5    9.3   14.3
Sept. 8    15 14.47   -13 58.3   6.344   5.982   64.6    8.8   14.3
     18    15 19.07   -13 33.0   6.451   5.947   55.9    8.0   14.3

                      (C) Copyright 2001 CBAT
2001 June 21                   (7647)            Daniel W. E. Green

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