Central Bureau for Astronomical Telegrams
IAUC 5094: 1990j; CY UMa
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Read IAUC 5095
Circular No. 5094
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
COMET MUELLER (1990j)
The following precise positions have been reported:
1990 UT R.A. (1950) Decl. Observer
Sept.17.32292 0 44 04.82 +12 24 30.6 Mueller
17.38542 0 44 03.68 +12 24 15.2 "
18.23653 0 43 45.35 +12 19 45.9 Balam
18.24903 0 43 44.86 +12 19 44.1 "
19.21821 0 43 23.26 +12 14 38.9 McCrosky
19.25808 0 43 22.26 +12 14 25.8 "
20.24868 0 42 59.31 +12 08 52.9 Balam
20.27646 0 42 58.56 +12 08 41.0 "
J. Mueller and J. D. Mendenhall (Palomar). 1.2-m Oschin Schmidt
telescope. Measurements of ends of a single trail.
D. Balam and J. Tatum (Victoria).
R. McCrosky and C.-Y. Shao (Oak Ridge). 1.5-m reflector + CCD.
The following parabolic orbital elements, from observations
Sept. 15-20, are still very uncertain; it is possible that this
is a short-period comet.
T = 1991 Feb. 24.85 ET Peri. = 232.92
Node = 209.38 1950.0
q = 1.6333 AU Incl. = 11.58
1990 ET R.A. (1950) Decl. Delta r m1
Sept.16 0 44.53 +12 31.0 1.684 2.635 17.3
21 0 42.68 +12 04.6
26 0 40.46 +11 32.6 1.557 2.543 17.0
Oct. 1 0 37.93 +10 55.2
6 0 35.18 +10 12.9 1.456 2.453 16.7
CY URSAE MAJORIS
P. Schmeer, Bischmisheim, West Germany, reports that this
dwarf nova is experiencing one of its rare superoutbursts, as
indicated by his visual magnitude estimates: Sept. 11.12 UT, [12.6;
14.16, 12.0; 15.16, 12.4:; 16.80, 12.7:; 19.12, 12.7.
1990 September 20 (5094) Daniel W. E. Green
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