Central Bureau for Astronomical Telegrams
IAUC 6943: N Oph 1998; 1998cm
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Circular No. 6943
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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NOVA OPHIUCHI 1998
A. V. Filippenko, D. C. Leonard, and M. Modjaz, University of
California at Berkeley; and R. G. Eastman, Lawrence Livermore
National Laboratory, report that CCD spectra (range 320-800 nm,
resolution 0.6 nm) obtained on June 18 UT with the Shane 3-m
reflector at Lick Observatory reveal that the object reported by
Nakano and Takamizawa on IAUC 6941 is indeed a nova. Strong
emission lines of H and He, as well as the Bowen feature near 465
nm, are superposed on a featureless continuum. The strongest lines
(especially H-alpha) exhibit a broad, box-shaped base (FWZI nearly
12 000 km/s) and a narrow core (FWZI about 2000 km/s).
K. Takamizawa reports that the limiting magnitude of his
patrol films (cf. IAUC 6941) is about 15. D. Hanzl, Brno, Czech
Republic, reports the following position obtained with a 0.40-m
reflector (+ CCD) on June 17: R.A. = 17h31m59s.79, Decl. =
-19o13'56".0 (equinox 2000.0). R. A. Kowalski, Zephyrhills, FL,
reports the following position end figures and magnitude obtained
with a 0.18-m reflector (+ unfiltered CCD) on June 18.244 UT:
59s.78, 55".9, 10.4. CCD photometry by Hanzl, based on comparison
star GSC 6243.435 (Tycho magnitudes V = 10.71 +/- 0.09, B-V =
+0.892 +/- 0.16): June 17.971 UT, V = 10.32 +/- 0.02, B-V = +0.68
+/- 0.05.
SUPERNOVA 1998cm IN ANONYMOUS GALAXY
L. Germany reports, on behalf of the Mount Stromlo Abell
Cluster Supernova Search Team (cf. IAUC 6639), the discovery of an
apparent supernova (V = 18.6) on V and R CCD images taken on June
10 (limiting mag V = 19.0) by S. Sabine at the Mount Stromlo 1.27-m
telescope (+ Macho Camera). SN 1998cm is located near Abell 1780
at R.A. = 13h44m12s.97, Decl. = +3o00'40".3 (equinox 2000.0), which
is 0".2 east and 0".4 north from the center of its host galaxy. A
nearby star has position end figures 15s.27, 5".7. SN 1998cm was
not visible on similar images taken on May 18 (limiting mag V =
19.0) but was confirmed by S. Chan with the same telescope on June
14 (limiting mag V = 19.0).
A. V. Filippenko, D. C. Leonard, and M. Modjaz, University of
California at Berkeley; and R. G. Eastman, Lawrence Livermore
National Laboratory, report that CCD spectra (range 320-1000 nm)
obtained on June 18 UT with the Shane 3-m reflector at Lick
Observatory reveal that the object is a supernova of type Ia,
probably within a week or two of maximum brightness. The
approximate redshift is 0.08, based on narrow emission lines in the
host galaxy.
(C) Copyright 1998 CBAT
1998 June 18 (6943) Daniel W. E. Green
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