Central Bureau for Astronomical Telegrams
IAUC 3698: AM Her AND AN UMa; 1982a; 1982d
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Read IAUC 3699
Circular No. 3698
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 617-864-5758
AM HERCULIS AND AN URSAE MAJORIS
A. M. Magalhaes, Vatican Observatory Research Group and
University of Sao Paulo; and S. Tapia, Steward Observatory, report that
these two magnetic binaries have both recently drifted to their low
states (cf. IAUC 3689, 3693). The following mean magnitudes have
been obtained at the University of Arizona observatories: AM Her,
Mar. 6, I = 12.7; Mar. 20, V = 13.0; Apr. 16, V = 15.3, V-R = +0.5,
R-I = +0.6; Apr. 19, V = 15.3; AN UMa, Mar. 20, V = 18.0, B-V = 0.0;
Apr. 20, V = 18.2. The circular polarization of AM Her in the I
band has remained negative throughout the cycle, while the amplitude
changed from -15 percent on Mar. 6 to -10 percent on Apr. 16.
PERIODIC COMET GRIGG-SKJELLERUP (1982a)
The following section of ephemeris is extracted from MPC 6215
(cf. the total magnitude estimates on IAUC 3695):
1970 ET R. A. (1950) Decl. Delta r m2
May 16 8 52.33 +18 11.7
21 9 22.83 +22 56.4 0.350 0.993 15.2
26 9 58.06 +27 40.0
31 10 37.99 +31 58.9 0.335 1.015 15.2
June 5 11 21.69 +35 27.7
10 12 07.14 +37 47.1 0.347 1.054 15.4
15 12 51.75 +38 50.9
20 13 33.16 +38 46.5 0.386 1.109 15.9
25 14 10.02 +37 48.8
30 14 42.00 +36 14.2 0.445 1.175 16.4
PERIODIC COMET TEMPEL 2 (1982d)
Continuation to the ephemeris on IAUC 3676:
1970 ET R. A. (1950) Decl. Delta r m2
May 31 11 07.81 +18 05.0 3.102 3.299 20.1
June 10 11 11.50 +17 17.8
20 11 16.80 +16 22.1 3.290 3.199 20.1
30 11 23.55 +15 19.0
July 10 11 31.57 +14 09.5 3.451 3.095 20.1
20 11 40.72 +12 54.4
30 11 50.89 +11 34.3 3.571 2.988 20.0
1982 May 19 (3698) Brian G. Marsden
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