Central Bureau for Astronomical Telegrams
IAUC 7409: Prob. N IN Aql; 2000ca
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Circular No. 7409
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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Phone 617-495-7244/7440/7444 (for emergency use only)
PROBABLE NOVA IN AQUILA
Kesao Takamizawa, Saku-machi, Nagano, Japan, reports his
discovery of an apparent nova (mag 10.0) on unfiltered 5-min T-Max
400 film exposures taken on Apr. 28.669 and 28.673 UT with twin
0.10-m f/4 patrol cameras, giving the star's position as R.A.
= 18h52m02s.0, Decl. = -1 28'14" (equinox 2000.0). Nothing appears
on Takamizawa's earlier patrol films from 1994 May 12 to 2000 Apr.
11 (limiting mag 13.5-15.0). T. Kato, Kyoto University, reports
that Minoru Yamamoto, Aichi, independently discovered this object
at mag 9.8 on a T-Max 400 exposure taken on Apr. 28.694. Visual
magnitude estimates forwarded by Kato: Apr. 29.654, 9.8 (S.
Takahashi, Shiga); 29.708, 10.0 (H. Hirosawa, Aichi); 29.731, 9.3
(H. Maehara, Saitama). It is uncertain if this star is identical
with the suspected 1917 nova (peak m_pg about 11) and eclipsing
binary (IBVS 4232, 4338) CI Aql, which has position end figures
03s.66, 38".7 (via Reinmuth 1925, A.N. 225, 385) and appears
identical with an R about 15.7 red star that is present in the
USNO-A2.0 star catalogue (position end figures 03s.56, 38".9).
M. Uemura and T. Kato, Kyoto University, report that they
obtained low-dispersion spectra (range 430-730 nm) of the new star
on Apr. 29.6 UT with the Okayama Astrophysical Observatory 1.88-m
telescope. H-alpha emission, whose FWHM is about 2300 km/s, is
prominent and H-beta is also detected. The spectrum is similar to
those of fast novae a few weeks after maximum. The Balmer lines
show no P-Cyg profiles. These spectral features indicate that the
outbursting object is a fast nova at a slightly evolved stage.
SUPERNOVA 2000ca IN ESO 383-32
J. Maza, University of Chile; and M. Hamuy, University of
Arizona, report the discovery by R. Antezana, on a 30-min
unfiltered T-Max 400 film taken by L. Gonzalez on Apr. 28.18 UT
with the University of Chile's Maksutov telescope, of an apparent
supernova (m_pv about 16.0) located at R.A. = 13h35m22s.98, Decl. =
-34o09'37".0 (equinox 2000.0), which is 0".6 east and 4".7 north of
the nucleus of ESO 383-32 (z = 0.024). SN 2000ca was confirmed by
Hamuy and A. Zuniga from BVRI images taken with the Cerro Tololo
0.9-m telescope on Apr. 29.27, and by M. Roth from JHK images taken
with the Las Campanas 1.02-m Swope telescope on Apr. 29.3. From
these images, estimated magnitudes for SN 2000ca are B = 15.91 +/-
0.05, V = 15.99 +/- 0.05, which suggests that the supernova is in
an early stage. A T-Max film taken on Apr. 7.263 showed nothing at
the position of the new object (limiting mag about 19.0).
(C) Copyright 2000 CBAT
2000 April 29 (7409) Daniel W. E. Green
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