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IAUC 7590: 2001W; N Sgr 2001; S/2001 (87) 1

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                                                  Circular No. 7590
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVA 2001W IN MCG +07-34-134
     T. Puckett, M. Marcus, and D. George, Mountain Town, GA,
report the discovery of an apparent supernova (mag 17.5) on an
unfiltered CCD frame (limiting mag 20.5) taken with the Puckett
Observatory 0.60-m automated supernova patrol telescope on Feb.
26.46 UT.  SN 2001W is located at R.A. = 16h41m15s.09, Decl. =
+39o17'44".5 (equinox 2000.0), which is 0".1 west and 20".6 north
of the center of MCG +07-34-134.  The new object was also present
and confirmed on CCD frames taken on Feb. 28.34 with a 0.40-m
reflector by J. Newton at Chiefland, FL.  SN 2001W does not appear
on unfiltered images taken by Puckett on 2000 June 29, July 8, and
Aug. 23 or on Palomar Sky Survey images taken on 1993 Apr. 30,
1989 May 31 (limiting mag about 21.0), and 1953 May 19 (limiting
mag about 19.7).

     Photographic magnitudes from T-Max 400 film, communicated in
part by T. Kato, Kyoto University:  Feb. 2.843 UT, [10.0 (H.
Nishimura, Kakegawa, Shizuoka, Japan); 17.832, [10.0 (Nishimura);
19.831, [13.7 (K. Takamizawa, Saki-machi, Nagano, Japan); 24.836,
8.1 (Nishimura).  W. Liller, Vina del Mar, Chile, reports the
following CCD broadband-V magnitudes: Feb. 25.367, 8.07; 26.335,
8.68; 27.374, 9.09; 28.341, 9.28.  Visual magnitude estimates:
Feb. 25.215, 8.5 (P. Schmeer, Bischmisheim, Germany); 25.63, 8.9 (A.
Jones, Nelson, New Zealand); 26.250, 9.3 (A. Amorim, Florianopolis,
Brazil); 26.835, 9.9 (A. Pearce, Nedlands, W. Australia); 27.205,
9.6 (A. Kammerer, Ettlingen, Germany); 27.794, 10.0 (Pearce);
28.635, 10.1 (J. Bedient, Honolulu, HI).

S/2001 (87) 1
     A. Storrs, Towson University, and the Hubble Space Telescope
(HST) Asteroid Team (F. Vilas, R. Landis, E. Wells, C. Woods, B.
Zellner, and M. Gaffey) confirm the companion to (87) Sylvia,
reported on IAUC 7588, in HST images made on Feb. 23.57 UT.  Six
images show a companion at p.a. 306 deg and separation 0".33.  The
companion appears bluer than does (87).  Preliminary determinations
of the magnitude difference between the two are as follows (listed
are filter name, wavelength, and difference in magnitude):  F439W,
439 nm, 6.00; F673N, 673, 6.27; F791W, 791, 6.44; F953N, 953, 6.67;
F1042M, 1042, 9.37.  The detections were marginal in the last two
filters (the sixth image was saturated).

                      (C) Copyright 2001 CBAT
2001 February 28               (7590)            Daniel W. E. Green

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