Central Bureau for Astronomical Telegrams

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IAUC 7523: 2000el; KS 1947+300; 73P

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                                                  Circular No. 7523
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVA 2000el IN NGC 7290
     T. Puckett, Mountain Town, GA; and D. George, Ottawa, ON,
report the discovery of an apparent supernova (mag 17.5) on an
unfiltered CCD frame (limiting mag 20.3) taken with the Puckett
Observatory 0.60-m automated supernova patrol telescope on Nov.
21.03 UT.  The candidate is located at R.A. = 22h28m26s.62, Decl. =
+17o08'51".2 (equinox 2000.0), which is 1".5 east of the center of
NGC 7290.  The new object was also present on an unfiltered CCD
frame taken by P. Boltwood, Stittsville, ON, with a 0.35-m
reflector on Nov. 24.05.  SN 2000el does not appear on unfiltered
images taken by Puckett during June 1-Oct. 14, and it does not
appear on Palomar Sky Survey images taken on 1995 July 30 (limiting
mag about 21.0) and on 1992 Sept. 1 (limiting mag about 21.0).


KS 1947+300
     A. Levine, Massachusetts Institute of Technology (MIT), and R.
Corbet, Goddard Space Flight Center (GSFC) and Universities Space
Research Association, report on behalf of the RXTE ASM team at MIT
and GSFC:  "RXTE All-Sky Monitor observations of the transient
x-ray source KS 1947+300 (Borozdin et al. 1990, Sov. Astron. Lett.
16, 345) show that the source is currently exhibiting an outburst
that began around Oct. 23 and reached a maximum flux of about 20
mCrab (1.5-12 keV) around Nov. 8.  The source is at most weakly
detected (flux < 6 mCrab) prior to the outburst.  A search for
periodic modulation in the pre-outburst light curve suggests a
possible period of 41.7 +/- 0.1 days with a semi-amplitude of about
1 mCrab and an average maximum flux of about 4 mCrab.  The epoch of
maximum flux is 1998 July 24.5 UT +/- 4 days.  These parameters
would predict a maximum near Nov. 4.  The optical counterpart of KS
1947+300 may be an early-type star (e.g., Goranskij et al. 1991,
Sov. Astron. Lett. 17, 399).  Further observations are encouraged."


COMET 73P/SCHWASSMANN-WACHMANN 3
     Total magnitude estimates (cf. IAUC 7518): Nov. 18.83 UT, 12.5
(K. Kadota, Ageo, Saitama, Japan, 0.18-m reflector + CCD; 12' tail
in p.a. 299 deg); 23.83, 10.4 (S. Yoshida, Ibaraki, Japan, 0.25-m
reflector; visual).

                      (C) Copyright 2000 CBAT
2000 November 24               (7523)            Daniel W. E. Green

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