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IAUC 4066: EXO 2030+375; 1985J; 1984f; 1984p; RS Oph

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IAUC number 

                                                  Circular No. 4066
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


EXO 2030+375
     A. N. Parmar, L. Stella, P. Ferri and N. E. White, EXOSAT
Observatory, telex: "EXOSAT has discovered a very bright (flux ~ 1
Crab at 2-30 keV), previously uncatalogued, transient x-ray pulsar.
The position is R.A. = 20h30m21s3, Decl. = +37deg27'51" (equinox 1950.0),
with an estimated error radius of 15".  The pulse period was measured
to be 41.83 s from an 11-hr observation on May 19.  The 2-10-
keV peak-to-peak modulation is ~ 100 percent.  The x-ray spectrum
is a power law with an energy index of 0.8 and a low-energy absorption
of 2.5 x 10**26 H atoms m**-2.  EXOSAT will continue to monitor
this source to search for orbital variations in the pulse period
and to study the evolution of the outburst.  An optical
investigation of the error circle is requested."


SUPERNOVA 1985J
     D. L. King, Royal Greenwich Observatory, reports that no trace
of the supernova reported on IAUC 4059 can be found to mag ~ 15 on
a 20-min exposure with the 0.33-m astrograph on May 16-17.


COMET SHOEMAKER (1984f)
     Total visual magnitude estimate by C. S. Morris using the
0.6-m reflector at Table Mountain Observatory: May 18.26 UT, 10.9.
There was a broad, fanshaped tail 10' long centered in p.a. 225.


PERIODIC COMET TSUCHINSHAN 1 (1984p)
     Total visual magnitude estimates: Feb. 17.08 UT, 11.7 (J.
DeYoung, Troy, VA, 0.15-m reflector); 21.09, 11.1 (J. Bortle,
Stormville, NY, 0.32-m reflector); Mar. 17.26, 11.6 (C. S. Morris,
Lockwood Valley, CA, 0.25-m reflector); 24.43, 11.8 (Morris).


RS OPHIUCHI
     Visual magnitude estimates: Mar. 17.19 UT, 9.3 (J. Ellerbe,
Nerja, Spain); 19.19, 9.3 (Ellerbe); 20.47, 9.5 (L. Cook, Concord,
CA); 23.50, 9.7 (R. Ducoty, Capitola, CA); 26.79, 9.5 (R. S.
McNaught, Coonabarabran, N.S.W.); 28.46, 9.5 (Cook); 29.19, 10.0
(Ellerbe); Apr. 1.1, 9.7 (M. Verdenet, Bourbon-Lancy, France);
3.41, 9.7 (P. Sventek, Houston, TX); 20.1, 9.6 (Verdenet).


1985 May 23                    (4066)              Brian G. Marsden

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