IAU Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 5067: 1990 MB; 1990c

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 5066  SEARCH Read IAUC 5068
IAUC number


                                                  Circular No. 5067
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


1990 MB
     Several contributors, initially E. Bowell, Lowell Observatory,
have remarked on the possibility that this object might be a "Mars
Trojan"--the first of its kind.  Further astrometric and physical
observations of it would therefore be particularly desirable.  The
orbit below, from MPC 16700, is still based on only a 24-day arc.
Numerical integration of this orbit over an interval of 60 000 days
shows the distance between 1990 MB and Mars to vary over a range of
0.3 AU during each revolution period P.  There is essentially a secular
(long period?) trend to the distances, however, diminishing from
1.9-2.2 AU around 1860 to 1.2-1.5 AU around 2020.  Minimum distances
from the earth, Venus and Jupiter are rather consistently 0.5, 0.8
and 3.5 AU, respectively.

     T = 1990 Oct. 29.2403 ET         Peri. =  95.4805
     e = 0.065461                     Node  = 244.4378  1950.0
     q = 1.422997 AU                  Incl. =  20.2267
       a =  1.522672 AU    n = 0.5245594    P =   1.879 years

     1990 ET      R.A. (1950) Decl.     Delta      r        V
     July 28    16 35.65    + 7 08.4    0.681    1.461    17.3
     Aug.  7    16 42.55    + 7 23.9
          17    16 53.14    + 7 09.2    0.802    1.447    17.8
          27    17 06.93    + 6 34.6
     Sept. 6    17 23.50    + 5 48.6    0.921    1.436    18.1
          16    17 42.43    + 4 57.5
          26    18 03.50    + 4 06.0    1.034    1.428    18.4
     Oct.  6    18 26.44    + 3 18.8
          16    18 51.00    + 2 38.9    1.144    1.424    18.6
          26    19 16.99    + 2 09.5
     Nov.  5    19 44.18    + 1 52.6    1.253    1.423    18.7
          15    20 12.32    + 1 49.7
          25    20 41.21    + 2 01.7    1.367    1.426    18.9


COMET LEVY (1990c)
     Total visual magnitudes: July 24.90 UT, 6.5 (A. Pearce,
Scarborough, Western Australia, 20 x 80 binoculars; 25.30, 6.8
(J. V. Scotti, Tucson, AZ, 10 x 50 binoculars); 26.30, 6.6 (J. E.
Bortle, Stormville, NY, 10 x 50 binoculars); 27.31, 6.3
(Scotti); 27.85, 6.3 (Pearce; 0.75-deg tail in p.a. 231 deg).


1990 July 28                   (5067)              Brian G. Marsden

Read IAUC 5066  SEARCH Read IAUC 5068


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


Valid HTML 4.01!