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IAUC 7277: V4641 Sgr, GM Sgr; V382 Vel; 1999ec

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                                                  Circular No. 7277
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/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


V4641 SAGITTARII AND GM SAGITTARII
     Citing Goranskij (1990, IBVS 3464), we noted on IAUC 7253 that
the star he attributed to GM Sgr is about 1' north of the position
given by Luyten (1927, HCO Bull. No. 852).  It has now been
established that the recent outbursts identified with GM Sgr (e.g.,
Downes et al. 1995, A.J. 110, 1824; IAUC 7119, 7120, 7254, 7256,
7257, 7263, 7265, 7267, 7271, 7276) were erroneously attributed to
this object, as the result of a misidentification by Kholopov
(Goranskij 1978, Astron. Tsirk. No. 1024).  N. N. Samus, Sternberg
Astronomical Institute, Moscow, informs us that the designation
V4641 Sgr has now been given to the apparent early-type cataclysmic
variable star, recently identified with SAX J1819.3-2525 = XTE
J1819-254.  M. Hazen, Harvard-Smithsonian Center for Astrophysics
(CfA), and D. Williams, AAVSO, aided by work in 1959 by B. Welther
(CfA), have located a Harvard plate that was taken on 1897 Aug. 3
with the Bruce 0.61-m telescope and evidently used by Luyten.  This
plate shows both GM Sgr and V4641 Sgr, and G. V. Williams (CfA)
provides the following measurement of GM Sgr from a Siding Spring
(digitized) survey plate taken on 1987 Apr. 8, indicating that
Luyten's original position was good to within 10":  R.A. =
18h19m21s.48, Decl. = -25o25'36".0 (equinox 2000.0; 13 USNO-A2.0
reference stars; uncertainty +/- 0".7).  Magnitude estimates of GM
Sgr from (blue) Harvard plates (spanning several decades following
1897) by Welther suggest a range from 15.2 (the maximum noted by
Luyten) to fainter than 17, indicating that GM Sgr is not a short-
period variable.  Contributors to, and editors of, other journals
should note that what has recently been called GM Sgr (particularly
on these Circulars in recent weeks) is in fact V4641 Sgr.  Hazen's
research on old Harvard plates regarding GM Sgr is continuing, in
collaboration with D. Hoffleit, Yale University Observatory.


V382 VELORUM
     Photometry of V382 Vel by P. M. Kilmartin at Mt. John
Observatory, Lake Tekapo (cf. IAUC 7238; standard deviations </=
0.01 mag):  Aug. 25.316 UT, V = 8.28, U-B = -0.89, B-V = -0.43, V-R
= +1.04, V-I = +0.32, airmass 2.00; 26.312, 8.34, -0.88, -0.43,
+1.03, +0.31, 2.00; Oct. 12.666, 9.05, -1.24, -0.55, +0.60, +0.06,
1.79.


SUPERNOVA 1999ec IN NGC 2207
     Corrigendum.  On IAUC 7268, last line, for  IC 2613.  read
  IC 2163.

                      (C) Copyright 1999 CBAT
1999 October 13                (7277)            Daniel W. E. Green

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