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IAUC 3360: X-RAY TRANSIENT IN Cen; V1668 Cyg; NEPTUNE II (NEREID)

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IAUC number 

                                                  Circular No. 3360
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 617-864-5758


X-RAY TRANSIENT IN CENTAURUS
     L. Kaluzienski and S. Holt, Goddard Space Flight Center, report
the detection of an outburst from a source in Centaurus with
the Ariel 5 all-sky monitor.  Observations of this region in the
instrument coarse spatial resolution mode yield an error box of
2o x 5o roughly centered on the position of Cen X-4, a transient
x-ray source last observed in 1969 July.  The source appeared between
~ 1979 May 11d05h and 13d01h UT, the flux at 3-6 keV increasing
from a level of < 0.1 Crab to ~ 0.7 Crab during that time.
The source continued to brighten steadily, and when last observed
early on May 14 had attained an intensity of ~ 1.4 Crab.  Although
the positional uncertainty of the source is relatively large, its
location at high galactic latitude and transient nature support the
tentative identification with Cen X-4.


V1668 CYGNI
     Visual magnitude estimate by J. Bortle, Brooks Observatory:
Apr. 25.26 UT, 12.2.


NEPTUNE II (NEREID)
     K. Aksnes, Division for Electronics, Norwegian Defence Research
Establishment, provides the following continuation to the
ephemeris on IAUC 3219:

     1979 ET     R. A. (1950) Decl.  dR.A. cos Decl. dDecl.
     May  17    17 14.06    -21 33.3    - 82"5       + 46"0
          27    17 12.97    -21 32.0    - 99.9       + 44.9
     June  6    17 11.81    -21 30.7    -116.2       + 43.5
          16    17 10.63    -21 29.4    -130.8       + 41.5
          26    17 09.48    -21 28.3    -143.3       + 38.9
     July  6    17 08.40    -21 27.2    -152.8       + 35.7
          16    17 07.43    -21 26.4    -158.2       + 31.6
          26    17 06.60    -21 25.8    -158.0       + 26.4
     Aug.  5    17 05.96    -21 25.5    -149.1       + 19.9
          15    17 05.54    -21 25.6    -125.1       + 11.4
          25    17 05.36    -21 26.0    - 68.4       +  0.3
     Sept. 4    17 05.48    -21 26.6    + 39.1       -  8.8
          14    17 05.79    -21 27.5    +114.5       -  7.8


1979 May 17                    (3360)              Brian G. Marsden

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