Central Bureau for Astronomical Telegrams
IAUC 7306: 1999ev; SATURN VI (TITAN)
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Circular No. 7306
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1999ev IN NGC 4274
G. M. Hurst, Basingstoke, England, reports the discovery by
Tom Boles, Wellingborough, of a supernova (mag 14.4) on a single
unfiltered CCD frame secured for the U.K. Nova/Supernova Patrol on
Nov. 7.225 UT with a 0.36-m f/11 reflector. Boles measured the
position of SN 1999ev to be R.A. = 12h19m48s.33, Decl. =
+29o37'22".2 (equinox 2000.0). M. Armstrong, Rolvenden, provides
position end figures 48s.24, 21".7 from an unfiltered CCD exposure
taken on Nov. 9.211 (mag about 14.5). Hurst notes that nothing is
visible at this location on the Vickers Deep Space CCD Atlas: North
(limiting mag about 17) or on an image obtained by M. Schwartz
(Cottage Grove, OR) on 1998 Dec. 8.
P. Garnavich, S. Jha, R. Kirshner, and P. Challis, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
1999ev was obtained with the Fred L. Whipple Observatory (FLWO)
1.5-m Tillinghast telescope by P. Berlind on Nov. 10.5 UT. The
spectrum confirms that the object is a supernova and indicates that
it is a type-II event past maximum. A strong H-alpha P-Cyg feature
is present, and the minimum of the absorption gives and expansion
velocity of 5300 km/s. Na I and many Fe II features are also
present on a continuum that gets brighter toward the red. CCD
images obtained by M. Holman with the FLWO 1.2-m telescope at the
time of the spectra give a brightness of V = 16.3. A measurement
of the position of the supernova yields R.A. = 12h19m48s.31, Decl.
= +29o37'20".4 (equinox 2000.0), which is 29" west and 28" north of
the nucleus of NGC 4274.
SATURN VI (TITAN)
T. Owen and N. Biver, University of Hawaii; A. Marten, Paris
Observatory, Meudon; H. Matthews, Joint Astronomy Centre, Hilo; and
R. Meier, Xerox, Zurich, report the detection of the (3-2) line of
C18O at 329.33 GHz in the radio spectrum of Titan. The
observations were made with the B3 receiver at the James Clerk
Maxwell Telescope on Oct. 19.4, 29.4, 31.4, and Nov. 1.4 UT.
Concurrent observations of the (3-2) line of CO at 345.80 GHz
allowed the use of a model (Hidayat et al. 1998, Icarus 133, 109)
to derive a preliminary value of 18O/16O about 2 times the
terrestrial value of 2 x 10**-3. This is distinctly lower than the
enrichment of 15N/14N = 4.5 times terrestrial found in Titan's HCN
(IAUC 6702). The carbon isotopes on Titan exhibit the terrestrial
ratio within current uncertainties (Hidayat et al. 1997, Icarus
126, 170).
(C) Copyright 1999 CBAT
1999 November 11 (7306) Daniel W. E. Green
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