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IAUC 7504: 2000dq; 2000 DP_107

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                                                  Circular No. 7504
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVA 2000dq IN MCG +00-6-43
     A. B. Aazami and W. D. Li, University of California at
Berkeley, on behalf of the Lick Observatory Supernova Search (cf.
IAUC 6627, 7126), report the discovery with the 0.8-m Katzman
Automatic Imaging Telescope (KAIT) of an apparent supernova (mag
about 18.5) on unfiltered images taken on Oct. 1.4 and 3.3 UT.  An
earlier image taken on Sept. 19.4 also showed a hint of the new
object.  SN 2000dq is located at R.A. = 2h08m20s.98, Decl. =
+1 11'00".8 (equinox 2000.0), which is 11".4 east and 2".2 south of
the nucleus of MCG +00-6-43.  A KAIT image of the same field on
Sept. 12.4 showed nothing at this position (limiting mag about
19.0).
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
2000dq, obtained by P. Berlind on Oct. 4.36 UT with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST spectrograph), shows it
to be a type-II supernova in the first week after maximum light.
The spectrum consists of a blue continuum with superposed P-Cyg
lines of hydrogen and Ca II.  The absorption of the H-alpha line
has a double minimum.  Adopting the NASA/IPAC Extragalactic
Database recession velocity of 12 687 km/s for the host galaxy, the
expansion velocity derived from the minimum of the H-beta line is
9200 km/s.


2000 DP_107
     P. Pravec and P. Kusnirak, Ondrejov Observatory; M. Hicks,
Table Mountain Observatory; B. Holliday, Corpus Christi
Observatory; and B. Warner, Palmer Divide Observatory, report: "Our
photometric observations of this object (cf. IAUC 7496, 7503) on
nine nights during Sept. 25.2-Oct. 4.2 UT revealed a lightcurve
that shows a fast variation with a period of 0.11564 +/- 0.00001
day and an amplitude of 0.19 mag, which we intepret as being a
rotation lightcurve of the primary, and there occurred brightness
attenuations with a period of 1.76 +/- 0.02 days that we interpret
as eclipse/occultation events in the binary system.  The estimated
secondary-to-primary diameter ratio is 0.37 (uncertainty about 10
percent).  The measured color indices, V-R = +0.388 +/- 0.013, B-R
= +1.088 +/- 0.019, U-R = +1.366 +/- 0.025, and R-I = +0.329 +/-
0.011, reveal that 2000 DP_107 is spectrally flat, consistent with
a C-type minor planet.  The next eclipse/occultation events are
predicted to occur around Oct. 5.18, 6.04, 6.94, and 7.80 UT.
Details and updates are available at
http://sunkl.asu.cas.cz/~ppravec/2000DP107.htm."

                      (C) Copyright 2000 CBAT
2000 October 4                 (7504)            Daniel W. E. Green

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