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IAUC 4848: 1989s; 1989 OB; 1989r

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IAUC number 

                                                Circular No. 4848
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 HELIN-ROMAN (1989s)
     The following precise positions have been reported:

     1989 UT             R.A. (1950) Decl.        m1    Observer
     Sept. 6.19288   17 48 02.90   - 8 14 53.9          Tatum
           6.42623   17 47 18.55   - 8 40 46.5   12.5   McNaught

J. B. Tatum (Climenhaga Observatory, Victoria).
R. H. McNaught (Siding Spring).  Uppsala Schmidt telescope.


1989 OB
     Orbital elements from MPC 15072:

                    Epoch = 1989 Oct.  1.0 ET
     T = 1989 Sept.27.11008 ET        Peri. =  71.29092
     e = 0.5548294                    Node  = 289.47195 1950.0
     q = 1.2048747 AU                 Incl. =   7.93155
       a =  2.7065461 AU   n = 0.22135072   P =   4.453 years

     1989 ET      R.A. (1950) Decl.     Delta      r       V
     Sept. 1    21 31.30    +16 03.0    0.261    1.242    15.0
           6    21 34.49    +19 11.3
          11    21 39.09    +22 08.1    0.251    1.219    15.0
          16    21 45.28    +24 49.4
          21    21 53.18    +27 11.8    0.251    1.207    15.1
          26    22 02.82    +29 12.3
     Oct.  1    22 14.20    +30 49.3    0.258    1.206    15.2
           6    22 27.18    +32 02.0
          11    22 41.54    +32 50.6    0.274    1.216    15.3
          16    22 56.93    +33 16.1
          21    23 12.97    +33 20.1    0.298    1.236    15.5


COMET OKAZAKI-LEVY-RUDENKO (1989r)
     Total visual magnitude estimates (cf. IAUC 4843):  Aug. 31.80
UT, 9.4 (M. Dionisi, Anzio, Italy, 20x80 binoculars); Sept. 1.89,
9.5 (G. Keitch, Wrington, Avon, England, 0.3-m reflector); 3.05,
9.8 (J. DeYoung, Rixeyville, VA, 0.25-m reflector); 5.06, 9.7
(J. E. Bortle, Stormville, NY, 0.32-m reflector); 6.19, 9.8 (C.
Spratt, Victoria, BC, 0.20-m reflector).


1989 September 6               (4848)             Daniel W. E. Green

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