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IAUC 5141: 1990ag; MWC 560; SATURN

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IAUC number 

                                                  Circular No. 5141
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 1990ag IN ANONYMOUS GALAXY
     C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of an apparent supernova (mag 19) on a Tech Pan film exposure
obtained Nov. 26.01 UT.  SN 1990ag is located at R.A. = 7h29m35s.69,
Decl. = +33 00'43".6 (equinox 1950.0), and the host galaxy is an
anonymous spiral face-on galaxy centered at R.A. = 7h29m35s.68, Decl.
= +33 00'48".5 (SN offset from the galaxy nucleus is 0".2 east, 4".9
south).


MWC 560
     R. F. Wing, Ohio State University; and A. U. Landolt, Louisiana
State University, report from Cerro Tololo Interamerican Observatory
the following photometric results for the unique object MWC 560 (cf.
IAUC 4955, 5127, etc.):  Dec. 1.27 UT, V = 9.65, B-V = +0.30, U-B =
-0.06, V-R = +0.46, R-I = +1.01, [1.04 microns] = 6.98, spectral
type M3.0; Dec. 2.19, 9.86, +0.35, +0.02, +0.49, +1.07, 6.99, M3.1;
Dec. 2.34, 9.76, +0.31, -0.01, +0.47, +1.04, 6.99, M3.1; Dec. 3.25,
9.78, +0.29, -0.03, +0.47, +1.04, 6.99, M3.1; Dec. 3.30, 9.73, +0.29,
-0.05, +0.46, +1.04, -, -; Dec. 4.21, 9.65, +0.31, -0.05, +0.45,
+0.99, 6.98, M2.9.  The wideband colors are similar to those reported
for 1990 Mar. 1 on IAUC 4976.  The narrowband [1.04 microns]
magnitude at 1040 nm remained nearly constant while V varied by 0.21
mag.  The spectral type is based on narrowband measures of TiO
absorption at 712 nm.


SATURN
     M. Kidger, Instituto de Astrofisica de Canarias, communicates:
"S. Torrell, Barcelona, Spain, reports a fifth outburst in the
Equatorial Zone of Saturn, detected on Nov. 2.715 UT at longitude 149
deg and confirmed by J.-M. Gomez on Nov. 2.722.  A prediscovery
observation was made by D. Verde on Oct. 20.910 with the 0.51-m Mons
reflector at El Observatorio del Teide.  V. Gonzalez and F. Hernandez
timed a meridian crossing on Nov. 22.8027.  The calculated rotation
period from all available observations is 10h14m57s.  Analysis of
all available data for the Wilber Great White Spot shows that the
mean period was 10h16m49s +/- 5s up to Oct. 5, but that an apparent
sudden reduction in period to about 10h12m occurred after this date;
the data base is limited to 5 observations after Oct. 5."


1990 December 6                (5141)             Daniel W. E. Green

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