Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 5126: Sgr A*; 1990l; AX Per

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 5125 SEARCH Read IAUC 5127
IAUC number 

                                                  Circular No. 5126
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


SAGITTARIUS A*
     M. R. Rosa, H. Zinnecker, and A. Moneti report, further to the
item on IAUC 5125:  "For the two extreme scenarios under debate for
the GC, our detection would imply the following:  The estimated,
combined absolute V = -9.5 for GZ-A and GZ-B (using Az about 14.0
mag, a distance modulus of 14.6 mag, V-z = -0.6) corresponds to
about fifteen O7(Ia) stars.  The total luminosity of these stars
would be 1 x 10E7 L(sun) and could provide most of the luminosity
in the innermost parsec of the GC.  If, however, one or both of the
new sources are related to a black hole, optical synchrotron
radiation or thermal continuum and line radiation from an accretion
disk might be expected. Spectroscopy and polarimetry of GZ-A and
GZ-B could be decisive in unravelling the true nature of the GC."


PERIODIC COMET MUELLER 3 (1990l)
     Improved orbital elements from MPC 17174:

     T = 1990 July 30.662 ET          Peri. = 225.451
     e = 0.28814                      Node  = 137.434   1950.0
     q = 3.00072 AU                   Incl. =   9.451
       a =  4.21532 AU     n = 0.113883     P =   8.65 years

     1990 ET      R.A. (1950) Decl.     Delta      r       m1
     Nov.  5     1 13.29    - 5 34.0    2.142    3.045    17.5
          15     1 09.53    - 5 41.5
          25     1 07.53    - 5 31.4    2.330    3.064    17.7
     Dec.  5     1 07.47    - 5 05.3
          15     1 09.36    - 4 25.1    2.585    3.087    18.0
          25     1 13.10    - 3 33.1
     Jan.  4     1 18.55    - 2 31.8    2.877    3.113    18.2


AX PERSEI
     This Z And-type cataclysmic variable has evidently faded,
as indicated by the following visual magnitude estimates (cf. IAUC
5113):  Oct. 12.78 UT, 10.5 (J. Speil, Walbrzych, Poland); 16.0,
11.1 (J. E. Bortle, Stormville, NY); 18.92, 10.6 (P. Schmeer,
Bischmisheim, Germany); 22.81, 10.8 (Speil); 24.16, 10.9 (Schmeer);
29.89, 11.8 (Speil).


1990 October 30                (5126)             Daniel W. E. Green

Read IAUC 5125 SEARCH Read IAUC 5127

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!