Central Bureau for Astronomical Telegrams

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IAUC 7478: 2000de; 2000df; COMET C/1999 T1 (McNAUGHT-HARTLEY); DISCOVERED BY SOHO

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                                                  Circular No. 7478
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)


SUPERNOVA 2000de IN NGC 4384
    A. Dimai, Cortina d'Ampezzo, Italy, reports the discovery by M.
Migliardi, Tourtour, Haut-Provence, France, of an apparent supernova
on CCD images taken on Aug. 10.9 and Aug. 11.9 UT (mag about 16) with
his 0.2-m f/10 Schmidt-Cassegrain telescope + CCD Hi-Sis 33 in the
course of the CROSS program (cf. IAUC 7373).  Confirmation was
obtained on an image taken on Aug. 13.85 (limiting mag 18.5) with
the Col Druscie' Observatory 0.5-m Ullrich telescope that showed the
supernova at mag about 16.  The new object is located at R.A. =
12h25m12s.17, Decl. = +54o30'28".7 (equinox 2000), which is 1"
east and 5" north of the nucleus of NGC 4384.  A CROSS image of
the same field on June 6 showed nothing at the position of SN 2000de
(limiting mag about 18.5).  A. Nakamura, Kuma Kogen, Japan, forwards the
following precise position end figures, measured by M. Aoki, Toyama,
from five unfiltered CCD images taken with a 0.43-m f/6 reflector on
Aug. 17.4, when the supernova was at mag 16.0: 12s.20, 29".5.
Nothing is visible on previous CCD images taken by Aoki between 1996
and 2000.


SUPERNOVA 2000df IN CGCG 51-70
     M. Schwartz, Cottage Grove, OR, reports his discovery of an
apparent supernova (mag about 17.2) on unfiltered CCD frames (limiting
mag about 18.5) taken on Aug. 17.204 and 18.194 UT, utilizing the
Tenagra-I 0.35-m automated supernova patrol telescope (cf. IAUC 7456).
The new object is located at R.A. = 16h14m12s.22, Decl. = +6o09'00".6
(equinox 2000.0), which is about 9".2 east and 2".6 south of the
nucleus of CGCG 51-70.  Nothing appears at the position of SN 2000df
on red and blue plates of either Palomar Sky Survey.


COMET C/1999 T1 (McNAUGHT-HARTLEY)
     Visual m1 estimates: July 3.84 UT, 12.7 (M. Mattiazzo, Wallaroo,
S. Australia, 0.20-m reflector); 4.90, 12.6 (A. Pearce, Nedlands,
W. Australia, 0.41-m reflector); 8.89, 12.3 (Pearce); Aug. 1.81, 10.9
(Mattiazzo).


COMETS DISCOVERED BY SOHO
     At the recent meetings of the IAU General Assembly it was decided
that comets discovered by SOHO could in the future be announced on the
Minor Planet Electronic Circulars, a summary list then appearing on
the IAU Circulars at a later date.

                      (C) Copyright 2000 CBAT
2000 August 18                 (7478)            Elizabeth O. Waagen

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