Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 5232: 1991N; N Her 1991; SV Sge

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).


Read IAUC 5231  SEARCH Read IAUC 5233
IAUC number


                                                  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

Read IAUC 5231  SEARCH Read IAUC 5233


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!