Central Bureau for Astronomical Telegrams
IAUC 3072: P/ENCKE; 1977c; NEPTUNE II (NEREID)
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Read IAUC 3073
Circular No. 3072
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK Telex: 921428
Telephone: (617) 864-5758
PERIODIC COMET ENCKE
The following ephemeris, by B. G. Marsden, is that in Handb.
Br. Astron. Assoc. for 1977 with a preperihelion extension. The
comet is very badly placed for observation at this perihelion passage,
the maximum elongation from the sun being 31o in late June.
During most of August the comet will be within 15o of the sun, and
the ephemeris is provided for astronomers working in the infrared.
Magnitudes are calculated as indicated on IAUC 2547.
1977 ET R. A. (1950) Decl. Delta r m1
June 6 2 50.90 +22 50.5 2.255 1.445 16.0
16 3 23.24 +25 07.4
26 4 01.94 +27 14.3 1.905 1.154 13.3
July 1 4 24.33 +28 08.7
6 4 49.12 +28 52.3 1.741 0.994 12.1
11 5 16.60 +29 20.3
16 5 46.97 +29 26.0 1.596 0.823 10.9
21 6 20.30 +29 01.4
26 6 56.50 +27 57.2 1.483 0.642 9.8
31 7 35.28 +26 03.5
Aug. 5 8 16.20 +23 11.2 1.410 0.463 9.0
10 8 58.72 +19 13.6
15 9 42.00 +14 12.5 1.356 0.345 8.5
20 10 24.53 + 8 28.7
25 11 04.94 + 2 36.6 1.275 0.402 9.0
30 11 43.26 - 3 00.4
Sept. 4 12 20.17 - 8 11.8 1.223 0.569 10.1
9 12 56.02 -12 50.8
14 13 30.81 -16 52.2 1.246 0.752 11.1
19 14 04.30 -20 13.5
24 14 36.18 -22 55.1 1.336 0.927 12.4
29 15 06.21 -25 00.3
Oct. 4 15 34.24 -26 33.7 1.474 1.091 13.8
14 16 24.29 -28 26.0
24 17 07.01 -29 09.0 1.830 1.389 16.4
Nov. 3 17 43.63 -29 09.0
13 18 15.45 -28 42.5 2.224 1.654 18.7
23 18 43.54 -27 59.5
Dec. 3 19 08.68 -27 05.7 2.609 1.892 20.6
J. Bortle, Brooks Observatory, provides the following total
magnitude predictions, derived from observations by M. Beyer and
himself, together with those of several southern-hemisphere
observers for the postperihelion phase. Perihelion asymmetry has been
allowed for and results reduced to a standard aperture of 6.78 cm.
1977 ET m1 1977 ET m1 1977 ET m1 1977 ET m1
July 2 11.2 July 18 9.5 Sept. 2 9.8 Sept.18 11.1
6 10.7 22 9.1 6 10.1 22 11.5
10 10.3 26 8.8 10 10.4 26 11.9
14 9.9 30 8.4 14 10.8 30 12.3
COMET LOVAS (1977c)
Further precise positions have been reported as follows:
1977 UT R. A. (1950) Decl. m1 Observer
Mar. 22.83559 10 09 21.72 +33 01 27.0 16.5 Mrkos
22.85168 10 09 20.87 +33 01 18.2 "
24.82889 10 08 01.19 +32 49 53.2 16.7 "
24.84388 10 08 00.40 +32 49 47.9 "
27.67917 10 06 10.74 +32 32 46.0 17.5 Seki
Apr. 10.58611 9 58 50.46 +31 DO 46.8 "
A. Mrkos (Klet Observatory).
T. Seki (Kochi Observatory, Geisei Station). 40-cm reflector.
NEPTUNE II (NEREID)
K. Aksnes, Center for Astrophysics, provides the following
continuation to the ephemeris on IAUC 2949:
1977 ET R. A. (1950) Decl. dR.A. cos Decl. dDecl.
May 17 16 55.08 -21 03.0 - 95"6 + 53"1
27 16 53.95 -21 01.1 -112.5 + 52.9
June 6 16 52.79 -20 59.3 -128.1 + 52.1
16 16 51.62 -20 57.6 -142.2 + 50.9
26 16 50.51 -23 56.0 -154.3 + 49.0
July 6 16 49.48 -20 54.6 -163.7 + 46.4
16 16 48.58 -20 53.5 -169.8 + 43.0
26 16 47.84 -20 52.7 -171.6 + 38.5
Aug. 5 16 47.29 -20 52.3 -167.4 + 32.7
15 16 46.96 -20 52.4 -154.4 + 25.3
25 16 46.86 -20 52.9 -126.4 + 15.5
Sept. 4 16 47.03 -20 53.8 - 66.7 + 2.2
14 16 47.49 -20 55.2 + 40.1 - 10.2
24 16 48.13 -20 56.7 +112.0 - 10.9
Oct. 4 16 48.95 -20 58.5 +144.0 - 7.0
14 16 49.94 -21 00.5 +158.5 - 2.2
1977 May 12 (3072) Brian G. Marsden
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