Central Bureau for Astronomical Telegrams
IAUC 2926: V1500 Cyg; 1976c; 1976d; 1975m
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Circular No. 2926
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
Western Union: RAPID SATELLITE CAMBMASS
V1500 CYGNI
A. A. Schoenmaker, Leiden Observatory, reports that an exposure
(103a-O emulsion) on Mar. 5 shows this nova to be surrounded
by a circular nebulosity about 10" across.
COMET SCHUSTER (1976c)
The following precise positions have been reported:
1976 UT R. A. (1950) Decl. m2 Observer
Feb. 25.19387 11 01 24.66 -42 45 08.9 Schuster
25.23542 11 01 21.96 -42 45 12.2 "
Mar. 3.16921 10 53 50.22 -42 49 04.1 "
3.18929 10 53 49.01 -42 49 04.6 "
4.07645 10 52 50.61 -42 49 01.6 "
4.10762 10 52 48.94 -42 49 00.9 "
5.07373 10 51 45.23 -42 48 47.8 "
5.10142 10 51 43.58 -42 48 48.1 "
6.54247 10 50 08.95 -42 48 13.9 17 Gilmore
6.58823 10 50 05.93 -42 48 13.4 "
H.-E. Schuster (European Southern Observatory). Measured on S3000
automatic measuring machine. Communicated by R. M. West.
A. C. Gilmore (Carter Observatory). Measurer: P. M. Kilmartin.
E. Roemer writes that on Mar. 5 m2 ~ 17.5 (cf. IAUC 2924); the
narrow tail extended 0'.1 north-northeast of the condensation.
The following orbital elements, by B. G. Marsden, are somewhat
uncertain (particularly T and Peri.) but suggest that the comet has the
largest perihelion distance on record (exceeding that of 1974 XII):
T = 1975 Apr. 25.29 ET Peri. = 201.90
Node = 22.79 1950.0
q = 7.1595 AU Incl. = 112.66
1976 ET R. A. (1950) Decl. Delta r m2
Mar. 3 10 54.01 -42 49.1 6.756 7.435 17.4
13 10 43.11 -42 41.9
23 10 32.58 -42 20.3 6.751 7.470 17.4
Apr. 2 10 22.82 -41 46.4
12 10 14.15 -41 03.1 6.854 7.507 17.4
22 10 06.77 -40 13.9
May 2 10 00.79 -39 22.1 7.051 7.546 17.5
12 9 56.22 -38 30.8
22 9 52.97 -37 42.8 7.311 7.587 17.6
m2 = 4.5 + 5 log Delta + 10 log r
COMET BRADFIELD (1976d)
The following precise positions have been obtained at the
Perth Observatory, Bickley, by M. P. Candy and C. Jekabsons:
1976 UT R. A. (1950) Decl. m1 Observer
Mar. 4.86875 21 50 50.96 -48 18 34.2 9 Candy
5.86684 22 12 24.93 -49 20 56.0 9 "
7.86929 23 02 47.70 -50 35 16.6 9 "
7.87986 23 03 05.22 -50 35 23.8 "
8.49149 23 19 59.61 -50 39 38.1 9 "
10.49375 0 17 36.66 -49 38 48.7 9 Jekabsons
The following parabolic elements, by B. G. Marsden, satisfy
these positions within ~ 2":
T = 1976 Feb. 25.060 ET Peri. = 221.760
Node = 69.506 1950.0
q = 0.67829 AU Incl. = 147.772
1976 ET R. A. (1950) Decl. Delta r m1
Mar. 13 1 25.58 -45 41.2
15 2 10.27 -40 59.8 0.544 0.783 9.1
17 2 45.49 -35 45.6
19 3 12.68 -30 34.5 0.610 0.825 9.6
21 3 33.73 -25 46.9
23 3 50.22 -21 30.9 0.710 0.873 10.2
25 4 03.39 -17 47.3
27 4 14.09 -14 33.4 0.831 0.923 10.8
29 4 22.96 -11 45.6
31 4 30.42 - 9 19.8 0.963 0.977 11.3
Apr. 2 4 36.81 - 7 12.6
4 4 42.36 - 5 20.9 1.100 1.032 11.8
m1 = 11.5 + 5 log Delta + 10 log r
PERIODIC COMET AREND (1975m)
The following precise position, obtained by T. Seki at the
Geisei Station, is from Orient. Astron. Assoc. Comet Bull. No. 119:
1976 UT R. A. (1950) Decl. m1
Jan. 12.77021 10 02 04.70 +35 18 44.5 18
1976 March 15 (2926) Brian G. Marsden
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