Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 5394: 1991d1; 4U 1700-37

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 5393 SEARCH Read IAUC 5395
IAUC number 

                                                  Circular No. 5394
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


COMET SHOEMAKER-LEVY (1991d1)
     E. M. and C. S. Shoemaker communicate the following observation
by C. Brewer, which is the average of 3 measurements of the trail
visible on the Palomar 1.2-m Schmidt plate (cf. IAUC 5389):

     1991 UT             R.A. (1950) Decl.
     Nov. 16.36458    3 28 08.24   +43 56 55.0

     Following are preliminary parabolic orbital elements from the
4 available observations.  This may be a short-period comet.

     T = 1991 Sept.15.954 ET          Peri. =   7.521
                                      Node  = 355.115   1950.0
     q = 1.23118 AU                   Incl. =  10.361

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Nov. 20     3 27.22    +43 39.2    0.623    1.577    16.9
          25     3 26.22    +43 07.3
          30     3 25.69    +42 29.1    0.720    1.670    17.5
     Dec.  5     3 25.75    +41 46.9
          10     3 26.47    +41 02.8    0.835    1.769    18.1
          15     3 27.89    +40 18.5
          20     3 29.97    +39 35.2    0.969    1.872    18.7


4U 1700-37
     G. J. Fishman, B. A. Harmon, B. Rubin, M. H. Finger, R. B.
Wilson, W. S. Paciesas, and C. A. Meegan, Marshall Space Flight
Center, NASA, report for the BATSE Experiment Team:  "Periods of high
x-ray flux (20-160 keV) from the binary system containing the x-ray
source 4U 1700-37 and optical companion HD 153919 have been observed
from daily monitoring of the source by earth occultation.  Count
rates in excess of 1.5 Crab, between 20 and 100 keV, were measured
from 4U 1700-37 at occultation on the following times:  Sept.
21.12287, Sept. 23.87218, Oct. 23.95736, Oct. 25.44441, and Nov.
12.81656 UT.  These measurements are evidence of occasional flaring
episodes of the source lasting several hours.  This behavior was
observed superimposed on the normal 3.4-day modulation associated with
its binary period."


1991 November 25               (5394)             Daniel W. E. Green

Read IAUC 5393 SEARCH Read IAUC 5395

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

Valid HTML 4.01!