Central Bureau for Astronomical Telegrams
IAUC 7330: 1999gj; V1494 Aql
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Circular No. 7330
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1999gj IN NGC 3251
G. M. Hurst, Basingstoke, England, reports the discovery by
Mark Armstrong, Rolvenden, of a supernova located at R.A. =
10h29m19s.27, Decl. = +26o06'19".2 (equinox 2000.0; average of two
measurements, from Nov. 17 and Dec. 8 frames), which was noted to
be 40" east and slightly south of the nucleus of NGC 3251. The
supernova appears on three of Armstrong's CCD frames, with the
following magnitudes being estimated: Nov. 17.20 UT, 17.5; Dec.
2.14, 18.0; 8.16, 18.0. The object is not present on the first or
second Palomar Sky Surveys (limiting mag about 20).
P. Garnavich, S. Jha, R. Kirshner, and P. Challis, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
1999gj was obtained by A. Mahdavi with the F. L. Whipple
Observatory (FLWO) 1.5-m Tillinghast telescope on Dec. 9.5 UT.
This shows the new object to be a type-Ia event, between 1 and 2
months after maximum light. Narrow emission lines from the host
galaxy give a recession velocity of 5300 km/s. CCD images obtained
with the FLWO 1.2-m telescope near Dec. 9.5 yield V about 19.0 for
SN 1999gj. Position end figures derived from the CCD images (based
on the HST Guide Star Catalog) are 19s.20, 20".2, which is 33" east
and 21" north of the galaxy nucleus.
V1494 AQUILAE
M. Pontefract, Imperial College, London; R. J. Ivison,
University College, London; M. Reuland, Leiden; and R. P. J.
Tilanus, Joint Astronomy Centre, Hilo, report the detection of
V1494 Aql using SCUBA on the James Clerk Maxwell Telescope on Dec.
8.1 and 9.1 UT (only a week after outburst): "Measured fluxes were
19 +/- 4 and 27 +/- 3 mJy at 0.85 mm, with preliminary flux
calibration based on Uranus. Tentative detections at 0.45 mm
suggest optically thick free-free emission. The nova may soon be
sufficiently bright to be detected/resolved at radio frequencies."
Visual magnitude estimates: Dec. 5.026 UT, 4.3 (S. Giovanardi,
New York City, NY); 5.643, 5.2 (K. Cernis, Vilnius, Lithuania);
6.06, 5.1 (W. G. Dillon, Missouri City, TX); 6.424, 5.8 (Y.-S. Park,
Chungju City, Chungbuk, South Korea); 6.742, 5.3 (S. E. Shurpakov,
Baran, Belarus); 7.378, 5.6 (Y. Nagai, Yamanashi, Japan); 7.77, 5.8
(J. M. San Juan, Madrid, Spain); 8.438, 5.9 (R. Qi, Beijing, China);
8.728, 5.7 (P. Schmeer, Bischmisheim, Germany); 9.697, 5.9 (A.
Baransky, Kiev, Ukraine); 10.68, 6.1 (A. Trebacz, Niepolomice,
Poland); 11.403, 6.1 (S. Yoshida, Ibaraki, Japan).
(C) Copyright 1999 CBAT
1999 December 11 (7330) Daniel W. E. Green
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