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IAUC 7828: P/2001 YX_127; 2002an; V2540 Oph

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IAUC number

                                                  Circular No. 7828
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)

COMET P/2001 YX_127 (LINEAR)
     An apparently asteroidal object discovered by LINEAR
(discovery observation below) and designated 2001 YX_127 (cf. MPS
47220, MPO 24028) has been found to have a broad, fan-shaped
extension in p.a. 100 deg on CCD images obtained on Feb. 14.2 UT by
T. B. Spahr with the 1.2-m reflector at Mount Hopkins.  Co-added
CCD R-band images taken at about the same time by C. W.
Hergenrother with the Catalina 1.54-m reflector show a 7" coma and
a broad tail 8" long in p.a. 100 deg.

     2001 UT             R.A. (2000) Decl.        m2
     Dec. 17.31658    4 47 24.54   +30 02 59.7   20.2

     Complete astrometry, the following orbital elements, and an
ephemeris appear on MPEC 2002-C97:

     T = 2003 Mar. 13.2865 TT         Peri. = 116.5924
     e = 0.179914                     Node  =  31.5250  2000.0
     q = 3.419865 AU                  Incl. =   7.9131
       a =  4.170129 AU    n = 0.1157390    P =   8.516 years

SUPERNOVA 2002an IN NGC 2575
     S. Benetti, G. Altavilla, A. Pastorello, M. Turatto, S.
Desidera, and E. Giro, Osservatorio Astronomico di Padova; and E.
Cappellaro, Osservatorio Astronomico di Capodimonte, write:  "A
spectrum (range 380-780 nm, resolution 2.5 nm) of SN 2002an (cf.
IAUC 7805), obtained on Feb. 5.02 UT with the Asiago 1.82-m
telescope (+ AFOSC), shows that it is a normal type-II supernova
about a week past maximum.  The spectrum is dominated by a blue
continuum:  spectral model fitting using SYNOW (Jeffery and Branch
1990, in Supernovae, World Scientific, p. 149) gives a blackbody
temperature of about 11 000 K and expansion velocity of about 9 000
km/s, as deduced from H I, He I, and Ba II P-Cyg line profiles.
The P-Cyg profile of H_alpha is not yet well developed, mostly
consisting of a broad shallow emission.  Evidence of interaction
with the circumstellar medium (cf. IAUC 7818) is not visible at
this epoch."

     Visual magnitude estimates by A. Pearce, Nedlands, W.
Australia:  Jan. 30.842 UT, 8.4; Feb. 7.833, 9.8; 10.856, 9.4;
11.826, 8.2; 13.837, 8.5.

                      (C) Copyright 2002 CBAT
2002 February 14               (7828)            Daniel W. E. Green

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