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IAUC 7958: 2002eo; V838 Mon; 46P; C/2000 C7

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IAUC number

                                                  Circular No. 7958
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)

     W. D. Li, University of California at Berkeley, reports the
LOTOSS (cf. IAUC 7906) discovery of an apparent supernova (mag
about 18.0) on unfiltered KAIT CCD images taken on Aug. 20.5 and
21.5 UT.  SN 2002eo is located at R.A. = 1h52m55s.18, Decl. =
+36o03'22".2 (equinox 2000.0), which is 13".9 east and 8".8 north
of the nucleus of NGC 710.  A KAIT image taken on Aug. 14.4 showed
nothing at this position (limiting mag about 19.0).

     A. Henden, Universities Space Research Association and U.S.
Naval Observatory (USNO); and U. Munari, Asiago Astronomical
Observatory, Padua, report that radical changes now affect the
light echo they discovered around V838 Mon (cf. IAUC 7859).  New
R-band imaging, obtained on Aug. 22.5 UT with the USNO Flagstaff
Station 1.0-m telescope (scale 0".68/pixel) with the object now
emerging from its conjunction with the sun, show that the light
echo has eroded dramatically.  The eastern half is much fainter
than in May, and the central hole has extended about 15" to the
northwest (cf. IAUC 7889).  The bright enhancement to the northwest
and the 'fan' to the southwest (which marked the light-echo
appearance in April and May) are, however, still visible.  The
outer diameter of the light echo is now approximately 59".
Magnitudes of the central star (+/- 0.05 mag due to airmass of
3.5), from observations obtained with USNO 1.0-m and 1.55-m
telescopes:  Aug. 17.7, J = 6.33, H = 5.42, K' = 4.37, L' = 2.77;
Aug. 22.50, V = 16.04, R = 14.67, I = 11.17.  For comparison,
the last measurements before conjunction with the sun gave V =
14.98, R = 12.75, and I = 9.82 on May 16.13 for V838 Mon, and in
quiescence it was at V = 15.5.

     Total visual magnitude estimates:  Aug. 13.08 UT, 10.4 (R. J.
Bouma, Groningen, The Netherlands, 0.31-m reflector); 15.11, 10.5
(P. Morel, Eygalayes, France, 0.53-m reflector); 17.89, 10.2 (A.
Pearce, Noble Falls, W. Australia, 0.20-m reflector); 20.77, 10.2
(Y. Nagai, Yamanashi, Japan, 0.32-m reflector).

COMET C/2000 C7 (SOHO)
     Contrary to the remarks on IAUC 7919, comet C/2000 C7 is a
member of the Marsden group (cf. IAUC 7832).

                      (C) Copyright 2002 CBAT
2002 August 23                 (7958)            Daniel W. E. Green

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