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IAUC 4067: 1985e; RS Oph

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                                                  Circular No. 4067
Central Bureau for Astronomical Telegrams
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

     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.

     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

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