Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 5208: 1991 DA

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 5207 SEARCH Read IAUC 5209
IAUC number 

                                                  Circular No. 5208
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


1991 DA
     R. M. West, European Southern Observatory, reports:  "Six 5-min
B and V CCD exposures were obtained with the Danish 1.54-m telescope
at La Silla during Mar. 15.005-15.033 UT.  The image FWHM was identical
to the seeing (1".4) and no coma was detected to a level of V
approximately 24.5 mag/arcsec2.  The object is apparently a rapid
rotator; the brightness increased from V = 17.80 +/- 0.02 to 17.33
+/- 0.02 during the 40-min interval; B-V = +0.7 +/- 0.1 (accuracy
reduced because of the fast change)."
     J. English and R. H. McNaught report that a more detailed
examination of the CCD images mentioned on IAUC 5199 confirms the
asteroidal appearance of 1991 DA, as is also true of CCD images obtained
by S. D. Ryder with the 1.0-m reflector at Siding Spring; these
latter images were reduced by McNaught and Ryder as follows:

     1991 UT             R.A. (1950) Decl.
     Mar. 14.56847    7 12 19.13   -72 55 38.6
          14.57446    7 12 17.50   -72 55 35.3
          14.57750    7 12 16.96   -72 55 33.5
          14.59056    7 12 13.69   -72 55 26.4

     Improved orbital elements from 14 observations Feb. 18-Mar. 14:

     T = 1990 Dec.  3.4579 ET         Peri. = 191.2467
     e = 0.866923                     Node  = 313.4108  1950.0
     q = 1.578819 AU                  Incl. =  61.8932
       a = 11.863912 AU    n = 0.0241192    P =  40.864 years

     1991 ET      R.A. (1950) Decl.     Delta      r       V
     Mar.  5     7 59.6     -73 50.5    1.592    1.948    17.3
          15     7 10.7     -72 51.9
          25     6 42.7     -71 12.7    1.779    2.095    17.6
     Apr.  4     6 30.75    -69 29.7
          14     6 29.65    -67 59.8    1.962    2.253    17.9
          24     6 36.08    -66 49.7
     May   4     6 47.94    -66 01.2    2.137    2.418    18.2
          14     7 04.07    -65 33.3
          24     7 23.77    -65 24.3    2.307    2.588    18.5
     June  3     7 46.61    -65 31.6
          13     8 12.36    -65 51.6    2.484    2.761    18.7


1991 March 15                  (5208)             Daniel W. E. Green

Read IAUC 5207 SEARCH Read IAUC 5209

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

Valid HTML 4.01!