Central Bureau for Astronomical Telegrams
IAUC 3989: G208-44; SNe; CH UMa
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Read IAUC 3990
Circular No. 3989
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
G208-44
R. S. Harrington and C. C. Dahn, U.S. Naval Observatory,
write: "The red dwarf G208-44 (R.A. = 19h53m, Decl. = +44deg21', equinox
1950.0), the brighter component of the 4.7-pc-distant double star
G208-44/45 (Harrington, Dahn and Guetter 1974, Ap.J. 194, L87),
has an unseen companion. Preliminary analysis of plates taken
with the U.S.N.O. 1.55-m reflector over 12 years suggests a period
of more than two decades, an amplitude on the order of 0"25, and a
mass of the companion of a few percent that of the sun."
SUPERNOVAE
R. Evans, Maclean, N.S.W., writes that his visual magnitude
estimates suggest that the supernova in NGC 1559 reached maximum
between July 29.8 and 31.8 UT: July 27.8, 13.5; 28.8, 13.5; 29.8,
13.25; 30.6, 13.25; 31.8, 13.2; Aug. 1.8, 13.3; 5.8, 13.5; 19.8,
13.7; 31.8, 14.0; these estimates are in comparison with the
foreground star in the galaxy's southwestern quadrant (cf. IAUC 3980),
measured by R. Buta, Mount Stromlo Observatory, at V = 13.5. With
reference to IAUC 3981, he adds that he did not detect the supernova
in NGC 991 under excellent conditions on July 28.8 UT, suggesting
that the object was then probably fainter than mv = 15.0.
R. W. Argyle, Royal Greenwich Observatory, sends the following corrected
position for the supernova in IC 121: R.A. = 1h25m46s73, Decl. =
+2deg15'30"0; the position on IAUC 3985 is of the galaxy's nucleus.
CH URSAE MAJORIS
S. Lubbock, St. Brides Major, Wales, reports the following
outbursts of this dwarf nova: Apr. 1, mv = 12.7; May 29, 12.7;
July 29, 12.5. J. Mattei informs us that these outbursts were
confirmed by AAVSO observers and lists the following earlier
outbursts: 1980 Feb. 1, mv = 10.6; Sept. 19, 12.3; 1981 Apr. 16,
10.8; 1982 Apr. 29, 10.4; Oct. 22, 11.3; Dec. 20, 11.8; 1983 Oct.
16, 11.0. She notes that the recent behavior suggests a shortening
of the 204-day period given in the CVS (3rd Supplement) and
recommends photometric and spectroscopic monitoring, particularly
if there is to be an outburst at the end of the present month. M.
Verdenet, Bourbon Lancy, France, has independently suggested that
there has been a change in the object's lightcurve.
1984 September 19 (3989) Brian G. Marsden
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