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IAUC 7357: P/2000 C1; 1999ax, 1999ay

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                                                  Circular No. 7357
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET P/2000 C1 (HERGENROTHER)
     Carl Hergenrother, Lunar and Planetary Laboratory, reported a
new object (discovery observation below) that showed an 11" tail in
p.a. 300 deg on one of four CCD images taken with the 0.41-m
Schmidt telescope at Catalina.  Following posting on The NEO
Confirmation Page, numerous CCD observers have reported cometary
appearance, as follows:  Feb. 5.3 UT, coma diameter about 12",
brighter 60" tail in p.a. 290 deg, extending more faintly to 180"
(J. E. McGaha, Tucson, AZ, 0.62-m reflector); Feb. 5.5, tail about
12" long toward the northwest (G. Billings, Calgary, AB, 0.36-m
reflector); Feb. 5.7, slightly diffuse with very faint tail about
10" long to the northwest (G. J. Garradd, Loomberah, N.S.W., 0.45-m
reflector); Feb. 6.1, coma diameter 0'.1, tail 0'.3 long in p.a.
290 deg (P. Pravec and P. Kusnirak, Ondrejov, 0.65-m reflector);
Feb. 6.4, faint tail < 10" long in p.a. about 290 deg (D. T. Durig,
Sewanne, TN).  Prediscovery observations by LINEAR on Jan. 4 and 8
have also been identified.  Complete astrometry and the following
orbital elements appear on MPEC 2000-C30:

     2000 UT             R.A. (2000) Decl.        m1
     Feb.  4.45802   12 10 38.72   + 4 53  6.1   17.1

     T = 2000 Mar. 18.7279 TT         Peri. =  50.6637
     e = 0.410396                     Node  = 127.1207  2000.0
     q = 2.099992 AU                  Incl. =   6.1192
       a =  3.561702 AU    n = 0.1466283    P =   6.722 years


SUPERNOVAE 1999ax AND 1999ay
     A. Gal-Yam and D. Maoz, Tel Aviv University, write:  "A
spectrum (range 440-570 nm) of SN 1999ax (IAUC 7130), obtained by
R. A. Stathakis on 1999 Apr. 9 with the 4-m Anglo-Australian
Telescope (+ RGO spectrograph), is similar to that of a type-Ia
supernova, about 3 weeks after maximum.  The redshift of SN 1999ax,
estimated from its broad features, is z about 0.05, making it a
foreground object to the cluster Abell 1852.  Another spectrum
(range 340-1000 nm) of SN 1999ax, obtained by G. Aldering on 1999
Apr. 7 with the Kitt Peak 4-m Mayall telescope, confirms the above
type and redshift, including a clear detection of the 615-nm Si II
feature.  Aldering also kindly provided us with a spectrum of SN
1999ay (IAUC 7130), obtained at the same time, showing SN 1999ay to
be of type II, at redshift about 0.04, which makes this a
foreground object to Abell 1966."

                      (C) Copyright 2000 CBAT
2000 February 6                (7357)            Daniel W. E. Green

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