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IAUC 3924: TWO Vars IN THE Ori NEBULA; Her X-1; SN IN NGC 4419

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IAUC number 

                                                  Circular No. 3924
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


TWO VARIABLES IN THE ORION NEBULA
     G. M. Hurst, Wellingborough, England, writes (see also The
Astronomer 1984, 20, 151) that R. Chanal, St. Etienne, France,
reported the discovery of an object of mpv = 13.5 at R.A. =  5h32m18s,
Decl. = -5deg35'6 (equinox 1950.0) on 1983 Dec. 29.  The object, about
1' northwest of V372 Ori, is also present (at mpv = 14) on
exposures by N. Scott, Altrincham, England, on 1983 Dec. 9 and 1984
Jan. 8.  Other evidence suggests that the object, which is probably
identical with the suspected infrared variable NSV 2229, is normally
no brighter than mpv ~ 17.  Scott also noted another variable
object at S = 5h32m18s, K = -5P36'1 (equinox 1950.0), at mag
13.5-14 on three exposures on 1978 Jan. 22 and Feb. 2, but not
obviously brighter than mag 18 on any other exposures he examined.

     R. W. Argyle, Royal Greenwich Observatory, writes that a
plate taken by him on 1983 Dec. 5 with the 0.66-m refractor shows
Chanal's object at the position (measured by P. Eldridge and J.
Sinclair) R.A. = 5h32m17s44, Decl. = -5deg35'38"0 (equinox 1950.0).  A
simple graphical solution using six stars in Andrews' photometric
atlas of M42 gave B = 13.2: subtraction of the surrounding
background nebulosity suggests that B = 14.4 is more reliable.
Scott's object was not present down to the limit of B > 16.5.


HERCULES X-1
     F. Giovannelli, Istituto di Astrofisica Spaziale, Frascati;
and V. Kurt, E. Sheffer and G. S. Bisnovatyj-Kogan, Space Research
Institute, U.S.S.R. Academy of Sciences, Moscow, report that
observations by the Soviet Station Astron during Mar. 1.54-1.62 UT
also showed Her X-1 in an on-state (cf. IAUC 3923).  The source
flux was ~ 30 counts mm**-2 s**-1 in the range 2-25 keV, and the total
source signal was twice the background.


SUPERNOVA IN NGC 4419
     W. P. S. Meikle reports the following infrared magnitudes,
obtained by D. M. Walther and himself with the U.K. Infrared Telescope
on Feb. 29.6 UT: J = 14.55 +/- 0.03, H = 13.91 +/- 0.04, K =
14.03 +/- 0.04.


1984 March 8                   (3924)              Brian G. Marsden

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