Central Bureau for Astronomical Telegrams
IAUC 2848: 1975l; 1975m; 1975e; N Cyg 1975
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Read IAUC 2849
Circular No. 2848
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
PERIODIC COMET HARRINGTON-ABELL (1975l)
E. Roemer, University of Arizona, reports that she has recovered
this comet on plates taken with the Steward Observatory's 229-cm
reflector on Kitt Peak. M. A. Daniel assisted. The indicated
correction to the ephemeris on IAUC 2807 is dR.A. = +0m.21, dDecl. = +0'.6.
An unpublished prediction by B. G. Marsden, making use of the 1968-69
observations as well as those in 1955 and 1962, requires correction
by dR.A. = -0m.01, dDecl. = -0'.5. (Because of the comet's extremely
close approach to Jupiter in Apr. 1974 - 0.037 AU - it is not sufficient
to interpret the correction merely as one in T.)
1975 UT R. A. (1950) Decl. m2
Oct. 6.39850 2 49.29 +30 09.9 ~21
6.44624 2 49.26 +30 10.2
PERIODIC COMET AREND (1975m)
This comet has also been recovered by E. Roemer and M. A.
Daniel, as shown below. The image of the comet is quite condensed.
The correction to the ephemeris on IAUC 2796 is Delta-T = +0.02 day.
1975 UT R. A. (1950) Decl. m2
Oct. 6.49560 8 59.84 +35 24.7 ~20
PERIODIC COMET SMIRNOVA-CHERNYKH (1975e)
The following precise positions have been obtained by E.
Roemer with the Steward Observatory's 229-cm reflector on Kitt
Peak. M. A. Daniel assisted. Measurer: C. C. McCarthy.
1975 UT R. A. (1950) Decl.
June 4.16667 9 45 21.06 +20 02 12.7
4.19138 9 45 22.38 +20 02 04.1
The following elements, by B. G. Marsden, are from 35 observations
Mar. 4 to June 4:
T = 1975 Aug. 5.850 ET
Peri. = 90.100 e = 0.14493
Node = 77.122 1950.0 a = 4.17201 AU
Incl. = 6.642 n = 0.115661
q = 3.56735 AU P = 8.52 years
1975/76 ET R. A. (1950) Decl. Delta r m2
Nov. 4 12 43.64 + 1 00.6 4.391 3.581 18.8
14 12 55.24 - 0 08.9
24 13 06.46 - 1 13.9 4.215 3.588 18.7
Dec. 4 13 17.21 - 2 13.7
14 13 27.36 - 3 07.6 3.989 3.596 18.6
24 13 36.78 - 3 54.8
Jan. 3 13 45.33 - 4 34.7 3.725 3.605 18.4
13 13 52.84 - 5 06.7
23 13 59.12 - 5 30.3 3.443 3.615 18.3
Feb. 2 14 04.00 - 5 45.0
12 14 07.28 - 5 50.6 3.165 3.627 18.1
22 14 08.85 - 5 47.2
Mar. 3 14 08.60 ~ 5 35.2 2.923 3.639 17.9
13 14 06.54 - 5 15.7
23 14 02.83 - 4 50.4 2.749 3.653 17.8
Apr. 2 13 57.75 - 4 21.5
12 13 51.75 - 3 52.1 2.674 3.668 17.8
m2 = 10.0 + 5 log Delta + 10 log r
NOVA CYGNI 1975
W. Liller and C. Y. Shao, Center for Astrophysics, Harvard and
Smithsonian Observatories, have reduced two series of prediscovery
photographs of the nova taken (on Kodak Tri-X Pan emulsion) by two
amateur astronomers, B. Mayer of Los Angeles, California, and P.
Garnavich, of Bowie, Maryland. The mean errors of the magnitudes
range from +/- 0.3 for the fainter values to +/- 0.2 for the brighter.
1975 UT V Observer 1975 UT V Observer
Aug. 29.052 8.41 Garnavich Aug. 29.325 4.37 Mayer
29.055 8.21 " 29.373 3.28 "
29.168 6.19 Mayer 29.398 3.39 "
29.193 5.85 " 29.422 3.18 "
29.217 5.14 " 29.446 3.06 "
29.252 5.33 " 29.471 2.89 "
29.276 4.64 " 29.495 3.11 "
29.300 5.12 "
A prediscovery photograph (high speed Ektachrome emulsion) by
R. P. Harbrecht, Salt Lake City, Utah, on Aug. 29.21 UT also shows
the nova; its magnitude is approximately 5.5.
Further selected recent visual magnitude estimates: Sept.
26.28 UT, 7.5 (D. Wallentine, Albuquerque, New Mexico); 28.16, 7.6
(K. Simmons, Jacksonville, Florida); Oct. 1.19, 7.7 (Wallentine);
7.10, 8.0 (P. Maley, Houston, Texas); 8.12, 8.0 (Maley).
1975 October 9 (2848) Brian G. Marsden
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