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IAUC 5433: A0535+26; 1991r

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IAUC number 

                                                  Circular No. 5433
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


A0535+26
     B. Agrinier, R. Comte, E. Costa, G. Cusumano, G. Gerardi, P.
Mandrou, J. L. Masnou, E. Massaro, G. Matt, T. Mineo, M. Niel, J. F.
Olive, B. Parlier, B. Sacco, M. Salvati, and L. Scarsi, Centre
d'Etude Spatiale des Rayonnements, Toulouse, report:  "The transient
pulsating x-ray source A0535+26 was observed by the 'F.I.GA.R.O. II'
gamma-ray experiment on 1990 July 9.  The analysis of 6 hr of data
obtained during July 9.30-9.60 UT shows a double-peaked light curve
at the expected period of 103.2 s.  We evaluate a pulsed flux of 8.8
+/- 2.3 x 10E-6 ph cmE-2 sE-1 keVE-1 in the band 148-260 keV.  This
is the first detection of this source at energies this high.  We also
find evidence of a low-energy cutoff below 167 keV; observations
in the range 100-150 keV at the next periastron passage would be
highly desirable to firm up the classification of possible cyclotron
features."


COMET HELIN-ALU (1991r)
     Improved orbital elements from MPC 19468:

                    Epoch = 1992 Feb. 28.0 TT
     T = 1992 Feb. 19.6750 TT         Peri. =  30.7536
     e = 0.999527                     Node  = 253.6539  2000.0
     q = 4.850512 AU                  Incl. =  49.2965

1992 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Jan. 29.0  18 33.91    - 5 23.0    5.638    4.853   34.1    6.5     15.6
Feb.  8.0  18 42.91    - 4 08.6    5.550    4.851   41.1    7.7     15.6
     18.0  18 51.39    - 2 47.2    5.450    4.851   48.4    8.8     15.5
     28.0  18 59.25    - 1 19.1    5.339    4.851   55.8    9.7     15.5
Mar.  9.0  19 06.38    + 0 15.6    5.219    4.853   63.2   10.5     15.4
     19.0  19 12.67    + 1 56.5    5.093    4.856   70.7   11.2     15.4
     29.0  19 18.01    + 3 42.9    4.963    4.860   78.3   11.6     15.3
Apr.  8.0  19 22.29    + 5 33.9    4.834    4.865   85.9   11.8     15.3
     18.0  19 25.41    + 7 28.3    4.708    4.872   93.4   11.9     15.2
     28.0  19 27.29    + 9 24.4    4.588    4.880  100.9   11.7     15.2



3C 279
     Corrigendum.  On IAUC 5431, line 15, for  3C 379  read  3C 279


1992 January 22                (5433)             Daniel W. E. Green

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