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IAUC 2808: Poss. N IN Sgr; Poss. COMET ANTAL; MX1401-45; A1524-61

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IAUC number 

                                                  Circular No. 2808
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


POSSIBLE NOVA IN SAGITTARIUS
     Dr. K. Osawa, Director of the Tokyo Astronomical Observatory,
communicates the following visual magnitude estimates by Yoshiyuki
(not Yoshikuyi, as was given on IAUC 2805) Kuwano: July 24.597 UT,
10.2; 25.572, 10.1; 26.623, 10.3.  The comparison star was SAO
185987 (CoD -28 13895).  On July 8 the possible nova was fainter
than magnitude 11.

     Mr. C. Scovil, Stamford Museum, provides the following
photovisual magnitude estimate: July 27.16 UT, 11.0 +/- 0.5.


POSSIBLE COMET ANTAL
     Mr. M. Antal, Skalnate Pleso Observatory, reports the possible
discovery of a comet, as follows:

     1975 UT          R. A. (1950) Decl.      m1
     July  8.93611   18 05.2     -21 05       14

The object was diffuse, without condensation or nucleus.  The daily
motion was about 1o in p.a. 60o or 240o.


MX1401-45
     D. Hearn, Massachusetts Institute of Technology, reports that
the SAS-3 group has discovered a source of soft x-rays at R.A. =
14h01m +/- 1m, Decl. = -45o.2 +/- 0o.4 (equinox 1950.0).  The source,
discovered on July 15, appears to be smaller than 1o in extent.  It is
detected most strongly in the 0.1 to 0.28 keV energy band, at a
level of about 10 percent of the total Cygnus Loop intensity in
that band.  A weak signal present in the 0.4 to 0.7 keV band
indicates a spectral temperature of 3 x 10**6 K or less.


A1524-61
     M. Watson, X-Ray Astronomy Group, University of Leicester,
sends the following improved position, derived from Ariel 5 Sky
Survey observations, of the transient x-ray source A1524-61 (= TrA X-1)
mentioned on IAUC 2729: R.A. =15h23m32s +/- 5s, Decl. = -61o49'.4 +/- 1'.2
(equinox 1950.0).


1975 July 29                   (2808)              Brian G. Marsden

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