Central Bureau for Astronomical Telegrams
IAUC 4145: CH Cyg; 1985p; Corrs
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Read IAUC 4146
Circular No. 4145
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
CH CYGNI
M. and J. Mikolajewski, Institute of Astronomy, N. Copernicus
University, Torun, telex: "After its drop in brightness and its
radio outburst in 1984 July, CH Cyg entered its nebular phase in
1985 Mar. The forbidden emission lines of [O III], [Ne III], and
[S II] were the strongest in the spectrum. The Balmer emission
lines were faint, narrow, and practically one-peaked; our 1985 Nov.
4 and 8 spectra show the Balmer line intensities at least 3 times
higher than in 1985 Apr.-Sept. The Balmer lines are again double-
peaked, with the violet component higher than the red one for H beta;
they exhibit broad emission wings at 1200-1500 km/s. The radial
velocities of three components are close to those observed in 1985
Jan.: -120, -50, and +20 km/s. The spectra (dispersion 1.8 nm/mm)
are practically the same as in 1985 Jan. The magnitudes on Nov. 6
were V = 7.5, B-V = +1.18, U-B = +0.35, and the star seems to be at
least 0.2 mag brighter than in mid-1985."
PERIODIC COMET CIFFREO (1985p)
Improved orbital elements are from 31 observations (further
observations will be published in the MPCs), Nov. 8-22:
T = 1985 Oct. 29.6291 ET
Peri. = 357.6326 e = 0.545690
Node = 53.1030 1950.0 a = 3.746258 AU
Incl. = 13.1074 n = 0.1359276
q = 1.701961 AU P = 7.25 years
1985/6 ET R.A. (1950.0) Decl. p r m1
Dec. 1 4 17.85 +29 26.7 0.749 1.731 11.8
11 4 10.47 +31 31.1
21 4 05.53 +33 07.5 0.837 1.776 12.1
31 4 04.40 +34 19.3
Jan. 10 4 07.49 +35 12.0 1.001 1.839 12.6
20 4 14.70 +35 50.8
30 4 25.49 +36 19.2 1.223 1.917 13.3
CORRIGENDA
On IAUC 4139, the title " Periodic Comet Hartley-Good (1985l)"
should read " Comet Hartley-Good (1985l)" .
On IAUC 4125, Periodic Comet Halley (1982i), line 24, for 333o
read 273o.
1985 December 6 (4145) Daniel W. E. Green
Read IAUC 4146
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