Central Bureau for Astronomical Telegrams
IAUC 4542: NEPTUNE II (NEREID); 1986h; 1988A
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Circular No. 4542
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 617-495-7244/7440/7444
NEPTUNE II (NEREID)
W. Landgraf, University of Gottingen, provides the following
measurements, obtained at the European Southern Observatory, of the
offset of Nereid from Neptune and Neptune I (Triton):
1987 UTC Nereid-Neptune* Nereid-Triton* Exp. Inst.
July Da cos d Dd m.e. Da cos d Dd m.e. min
,, ,, ,, ,, ,, ,,
1.127431 -113.46 + 0.70 0.1 - 98.50 + 2.06 0.02 1 2.2-m
2.21111 -114.18 - 0.47 0.3 -101.64 -12.23 0.1 40 GPO
3.25486 -113.8 - 1.8 1 80 GPO
* D = Delta, a = R.A., d = Decl.
The 2.2-m telescope positions were made together with Barteldrees,
Dettmar, Pauls, and Seidensticker and were obtained with a CCD and
using a Gunn r filter; the magnitude difference Nereid-Triton was
6.6 +/- 0.6. The GPO positions are photographic in 0".7 seeing; the
last observation is uncertain because the image is influenced by a
star. The following improved orbital elements, also by Landgraf,
satisfy 60 observations 1949-1987 with mean error 0".6. Full
perturbations, including those by Triton, were taken into account.
The elements apply to the mass center of Neptune and Triton, and
the angles are referred to the ecliptic.
M = 72.654 +/- 0.310 Epoch = 1989 Oct. 1.0 TDB
n = 1.000006 +/- 0.000600 Peri. = 294.742 +/- 0.530
a = 0.0369619 +/- 0.0000885 AU Node = 321.075 +/- 0.572 1950.0
e = 0.754553 +/- 0.000394 i = 4.837 +/- 0.046
The Sun/(Neptune + Triton) and Neptune/Triton mass ratios were
determined to be 19237 +/- 54 and 3822 +/- 700, respectively.
PERIODIC COMET SCHWASSMANN-WACHMANN 2 (1986h)
Total visual magnitude estimates (L = reflector): 1987 Oct.
21.46 UT, 12.2: (E. Jacobson, Evansville, MN, 0.25-m L); Nov. 1.18,
13.4 (R. Bouma, Groningen, The Netherlands, 0.51-m L); 12.84, 11.7
(M. Clark, Armadale, W. Australia, 0.31-m L); 1988 Jan. 24.47 UT,
13.7 (A. Hale, Las Cruces, NM, 0.41-m L); 25.47, 13.7 (Hale).
SUPERNOVA 1988A IN M58
R. P. Binzel, Planetary Science Institute, reports magnitude
B = 14.76 +/- 0.02 on Jan. 27.427 UT (McDonald Obs. 0.76-m refl.).
Visual magnitude from J. Bryan, Georgetown, TX: Jan. 24.27, 14.1.
1988 February 3 (4542) Daniel W. E. Green
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