Central Bureau for Astronomical Telegrams
IAUC 5312: 1991am; 1991al; AM Her; 1991t
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 5313
Circular No. 5312
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 1991am IN MCG +06-37-006
C. Pollas, Observatoire de la Cote d'Azur, reports his discovery,
on a technical pan film (limiting mag 21.5) taken on July 14.92
UT by D. Albanese, of an apparent supernova of mag 19.0 located in
MCG +06-37-006 at R.A. = 16h40m05s.67, Decl. = +37 49'49".6 (equinox
1950.0). A July 24.90 red exposure (limiting mag 20) by Pollas
shows the object at R about 19. The host galaxy is a face-on spiral
galaxy (mag 16) with center at R.A. = 16h40m05s.36, Decl. =
+37 49'43".5; a nearby star of mag 15 is at R.A. = 16h40m01s.10,
Decl. = +37 50'25".7. Nothing is present on the POSS prints to B =
21 and R = 20.
SUPERNOVA 1991al IN ANONYMOUS GALAXY
P. Bouchet, M. Della Valle, and J. Melnick, European Southern
Observatory, report: "Preliminary inspection of a low-resolution CCD
spectrum (360-870 nm) of SN 1991al (cf. IAUC 5310), obtained on July
21.38 UT with the ESO New Technology Telescope at La Silla, yields
P-Cyg profiles for Balmer lines and Na I (587 nm) and indicates that
this is a type-II supernova. The expansion velocity, corresponding
to the difference between the rest wavelength in the galaxy's frame
and the minimum of the absorption, is about 8000-9000 km/s. The
redshift of the host galaxy, determined from the H-alpha emission,
is z = 0.01."
AM HERCULIS
W. Goetz and K. Heiland, Sonneberg Observatory, report that
observations in B on July 16, 19, and 20 show this variable in its low
state again. Visual magnitude estimates (cf. IAUC 5254): Apr.
21.44 UT, 13.1 (P. Sventek, Houston, TX); May 5.02, 13.1 (S. Korth,
Dusseldorf, Germany); 20.08, 13.3 (M. Verdenet, Bourbon-Lancy,
France); 22.07, 14.0 (Verdenet); June 4.91, 14.0 (Korth);
9.84, 13.3 (A. Boattini, Florence, Italy); 30.84, 14.0 (Boattini);
July 4.94, 14.2 (Korth).
PERIODIC COMET HARTLEY 2 (1991t)
Total visual magnitude estimates: July 15.43 UT, 9.4 (C. S.
Morris, Pine Mountain Club, CA, 20x80 binoculars); 16.42, 10.2 (A.
Hale, Las Cruces, NM, 0.41-m reflector); 21.99, 10.8 (J. Jahn,
Bodenteich, Germany, 0.20-m reflector); 24.08, 10.4 (H. Mikuz, Cres,
Yugoslavia, 0.20-m reflector).
1991 July 25 (5312) Daniel W. E. Green
Read IAUC 5313
Our Web policy. Index to the CBAT/MPC/ICQ pages.
