Central Bureau for Astronomical Telegrams
IAUC 3030: N Sge 1977; 1975n
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Read IAUC 3031
Circular No. 3030
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
NOVA SAGITTAE 1977
J. A. Bailey, Astrometry Department, Royal Greenwich Observatory,
provides the following precise position: R.A. = 19h37m08s.18, Decl. =
+18o00'58".2 (equinox 1950.0); the photographic magnitude on Jan
16.70 UT was 9.0. C. Y. Shao, Center for Astrophysics, reports
that the photographic magnitude was 8.8 on Jan. 13.94 UT and has
measured the position from a plate taken by R. E. McCrosky at the
Harvard College Observatory's Agassiz Station as (end figures only)
08s.15, 57".7; he adds that inspection of the Palomar Sky Survey
prints shows that there appear to be no stars brighter than photographic
magnitude ~ 19 within about 8" of the nova's position.
Further visual magnitude estimates: Jan. 7.79 UT, ~ 7.0 (G. M.
Hurst, Northampton, England); 14.21, 8.6 (K. Locher, Grut-Wetzikon,
Switzerland); 17.08, 8.7 (J. Morgan, Prescott, Arizona).
COMET WEST (1975n)
Further precise positions have been reported as follows:
1976 UT R. A. (1950) Decl. Observer
Apr. 1.1160 20 49 15.02 +13 34 11.8 Hoffmann
1.1291 20 49 14.09 +13 34 23.5 "
June 2.14054 18 54 59.39 +17 12 38.1 Torres
M. Hoffmann (Hoher List Observatory). Evidently nucleus A.
C. Torres and F. Costa (University of Chile, Cerro El Roble Station).
Nucleus A. Offset of nucleus B, 45".9 in p.a. 295o; offset
of nucleus D, 19".7 in p.a. 301o.
The following improved orbital elements, by B. G. Marsden, are
from 41 preperihelion observations 1975 Aug. 10-1976 Feb. 16 and
177 postperihelion observations 1976 Mar. 4-Sept. 25 of nucleus A.
Perturbations by all nine planets were considered. Slight systematic
trends (to perhaps 4") are evident in the residuals. Attempts to
utilize instead the postperihelion observations of nuclei D and B
were less satisfactory (particularly in the case of nucleus B).
Epoch = 1976 Mar. 3.0 ET
T = 1976 Feb. 25.2216 ET Peri. = 358.4190
e = 0.999971 Node = 118.2313 1950.0
q = 0.196626 AU Incl. = 43.0700
1977 January 20 (3030) Brian G. Marsden
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