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IAUC 7725: C/2001 S1; 2001en; V4334 Sgr

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                                                  Circular No. 7725
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)

     B. Skiff, Lowell Observatory, reports his discovery of an
apparent comet on LONEOS telescope images obtained on Sept. 26.4
UT, when the object appeared distinctly less well concentrated than
nearby stars (despite poor seeing), with an apparent 17" coma.
Observations by R. H. McNaught at Siding Spring on Sept. 26 show a
coma barely different from the 2"-3" seeing but with a short tail
(< 10" long) in p.a. about 40 deg.  J. G. Ries reports that CCD
images obtained with the 0.76-m reflector at McDonald Observatory
on Sept. 28.4 confirm the northeastward tail of length about 10".

     2001 UT             R.A. (2000) Decl.        m2
     Sept.26.37650    2 23 38.75   -29 48 06.3   19.7

All the available astrometry, the following preliminary parabolic
orbital elements and an ephemeris appear on MPEC 2001-S75:

     T = 2001 June  1.104 TT          Peri. = 284.221
                                      Node  = 329.579   2000.0
     q = 3.75865 AU                   Incl. = 139.348

     An independent discovery of this supernova (cf. IAUC 7724) at
Beijing Astronomical Observatory has been relayed from Wan Zhou via
W. Li.  The Beijing group found SN 2001en on an exposure taken on
Sept. 27.53 UT at mag about 17.4.  Its position end figures were
found to be 22s.82, 30".2 (equinox 2000.0).  Nothing was visible on
a Beijing image obtained on Sept. 12.64 (limiting mag 18.2).

     H. U. Kaeufl, European Southern Observatory (ESO); F. Kerber,
Space Telescope European Coordinating Facility, ESO; and J. Koller,
Rice University, report spectrophotometric fluxes, obtained with
the ESO 3.6-m telescope (+ new infrared focal reducer TIMMI2):
2000 Oct. 11, 69.1 Jy in band 7.7-8.1 microns, 32.9 Jy in band
11.7-12.9 microns; 2001 Aug. 13, 67.0 Jy, 57.3 Jy.  They add:
"Compared to the last known measurement in this wavelength
regime (1998 June 12; IAUC 6938), the infrared flux density had
increased by a factor of seven by 2000 Oct. 11.  Thereafter the
changes in flux are less drastic and indicate cooling of the
circumstellar material."

                      (C) Copyright 2001 CBAT
2001 September 29              (7725)            Daniel W. E. Green

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