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IAUC 5568: 1973 NA = 1992 OA; N Sgr 1992 No. 2

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                                                  Circular No. 5568
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


1973 NA = 1992 OA
     R. H. McNaught, Siding Spring Observatory, reports his
discovery of a fast-moving asteroidal object, designated 1992 OA,
on a July 26 exposure by Q. A. Parker with the U.K. Schmidt and his
confirmation of it on a July 27 exposure with the Uppsala Southern
Schmidt:

     1992 UT             R.A. (2000) Decl.        V
     July 26.36985   14 58 20.53   -75 15 27.5   17.5
          26.40804   14 58 10.55   -75 14 55.5
          27.44235   14 54 20.78   -75 02 32.0
          27.45990   14 54 16.65   -75 02 17.4

     G. V. Williams, Harvard-Smithsonian Center for Astrophysics,
has identified 1992 OA with the lost Apollo object 1973 NA, the
minor planet with the highest known orbital inclination to the
ecliptic:

                    Epoch = 1992 June 27.0 TT
     T = 1992 May   9.0567 TT         Peri. = 118.2411
     e = 0.638399                     Node  = 101.1224  2000.0
     q = 0.880103 AU                  Incl. =  68.0128
       a =  2.433905 AU    n = 0.2595665    P =   3.797 years

1992 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    V
July 17    16 16.0    -77 10.3   0.448   1.292  118.5   43.7   16.5
     22    15 22.7    -76 12.1   0.548   1.337  114.1   43.9   17.0
     27    14 55.9    -75 07.6   0.649   1.383  110.4   43.5   17.4
Aug.  1    14 43.4    -74 14.5   0.750   1.428  107.1   42.8   17.8
      6    14 38.9    -73 34.7   0.851   1.474  104.1   41.9   18.1
     11    14 39.4    -73 06.5   0.951   1.520  101.3   40.8   18.4
     16    14 43.3    -72 47.8   1.050   1.565   98.7   39.7   18.7
     21    14 49.8    -72 36.6   1.148   1.610   96.3   38.6   18.9
     26    14 58.2    -72 31.4   1.244   1.655   93.9   37.5   19.1


NOVA SAGITTARII 1992 No. 2
     Further unfiltered CCD magnitudes from W. Liller, Vina del
Mar, Chile (cf. IAUC 5564):  July 15.00 UT, 8.48; 21.00, 8.99;
24.95, 9.40; 26.01, 9.56; 27.05, 9.45 (comparison star SAO 186744).


1992 July 28                   (5568)            Daniel W. E. Green

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