Central Bureau for Astronomical Telegrams
IAUC 4067: 1985e; RS Oph
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 4068
Circular No. 4067
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
COMET MACHHOLZ (1985e)
Donald E. Machholz reports his discovery of a comet from near
Big Bear City, CA; the following visual observations are available:
1985 UT R.A. (1950.0) Decl. m1 Observer
May 27.4674 0 49.6 +15 08 ~9.5 Machholz
28.458 0 55.1 +15 35 Rattley
28.4708 0 55.3 +15 37 9.3 Machholz
28.493 0 55.2 +15 38 9.2 Morris
D. E. Machholz. May 28 observation from San Jose, CA. Object
diffuse, with no condensation or tail. 0.25-m f/3.8 reflector.
C. Morris (near Mt. Wilson, CA). 0.25-m refl. Comet moderately
condensed, but with no sharp condensation, coma diameter 4'.1.
G. Rattley (Magma, AZ). 0.25-m reflector. Coma diameter about 2'-3'.
Confirmation was also made by A. Hale (m1 = 9.1, 0.20-m refl.,
near Mt. Wilson, CA) and by J. Marling, Livermore, CA.
RS OPHIUCHI
M. A. J. Snijders, Royal Greenwich Observatory; A. Cassatella,
B. J. M. Hassall and A. Harris, International Ultraviolet Explorer
Observatory, Villafranca, telex the following, on behalf of the
European IUE Target of Opportunity Team for Novae: "We report low-
and high-resolution IUE observations of this recurrent nova following
its recent outburst. Fine-error-sensor magnitudes are: Feb. 8,
7.3; 14, 7.8; 21, 8.2; Mar. 10, 9.2; 23, 9.4; Apr. 9, 10.0; May 1,
11.2; 17, 11.6. The initial observations on Feb. 8 showed a
continuum flux larger by a factor of 35 (at 290 nm) than preoutburst
observations in 1982 Oct. On May 17 the 290-nm continuum had
returned to about the same level as in 1981 Apr. Estimates of the
reddening from the 220-nm feature and line ratios indicate a value
E(B-V) = 0.73. Emission lines in a wide range of ionization levels
are observed. Those of higher ionization peak at later stages
in the decline than those from lower ionization levels. Very high
ionization forbidden lines from Fe XI, XII, and XIII are observed
during the latest stage of the decline. The profiles of the lines
are complicated, consisting of several components whose relative
intensities change with time. Contrary to conditions with classical
novae, the expansion velocities decrease with time, as was also
observed during the 1958 outburst."
1985 May 28 (4067) Daniel W. E. Green
Read IAUC 4068
Our Web policy. Index to the CBAT/MPC/ICQ pages.
