Central Bureau for Astronomical Telegrams
IAUC 5232: 1991N; N Her 1991; SV Sge
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Circular No. 5232
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1991N IN NGC 3310
A. V. Filippenko, University of California at Berkeley,
communicates: "A. S. Stanford (also of Berkeley) obtained a CCD spectrum
(range 817-934 nm, resolution 0.5 nm) of SN 1991N (cf. IAUC 5227) on
Apr. 4 UT with the Shane 3-m reflector at Lick Observatory. Inspection
of the uncalibrated data reveals a strong, broad P-Cyg profile
at the expected wavelength of the Ca II near-infrared triplet,
indicating that the object is indeed a supernova. From this limited
wavelength range, however, it is not possible to determine the exact
classification of the supernova, which is superposed on an H II
region."
NOVA HERCULIS 1991
R. D. Gehrz, T. J. Jones, and G. Lawrence, University of
Minnesota, provide the following red and infrared magnitudes, obtained
with the 0.76-m telescope at the O'Brien Observatory, using a 25"
beam: Mar. 29.46 UT, R = 6.9, J = 6.6, H = 6.5, K = 6.2, L = 5.5, M
= 4.2:; 30.44, J = 6.86, H = 6.88, K = 6.25, L' = 5.23. The Mar. 29
observations were obtained with a bolometer, those on Mar. 30 with
an indium antimonide photometer.
T. M. Eubanks, U.S. Naval Observatory, reports that Very Long
Baseline Interferometry observations during six 784-s scans around
Mar. 27.63 UT along the 5035-km baseline joining 25.9-m antennae at
Gilmore Creek, AL, and Green Bank, WV, set an upper limit to the
correlated flux from the nova of about 80 mJy in eight 2-MHz
channels across 350 MHz at the X-band (centered on 8391 MHz) and of
about 65 mJy in six channels across 85 MHz at the S-band (2260 MHz).
SV SAGITTAE
G. M. Hurst, Basingstoke, England, reports that this R CrB-type
variable is fading, as indicated by the following magnitude estimates
(visual unless indicated otherwise): 1990 Nov. 12.85 UT, 10.8
(A. Pereira, Cabo da Roca, Portugal); 1991 Mar. 28.2, 12.0: (P.
Schmeer, Bischmisheim, Germany; poor observing conditions); Apr.
3.10, [12.0 (D. Buczynski, Conder Brow Observatory, photographic);
3.13, 12.7 (G. Poyner, Birmingham, England); 4.07, 12.9 (Poyner).
1991 April 5 (5232) Daniel W. E. Green
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