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IAUC 3389: 1979d; LUNAR Occn OF (4)

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IAUC number 

                                                  Circular No. 3389
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758


PERIODIC COMET RUSSEL (1979d)
     K. S. Russell, U.K. Schmidt Telescope Unit, communicates the
following precise positions from observations by P. Standen, J.
Barrow and himself:

     1979 UT             R. A. (1950) Decl.        m1
     June 16.4419     14 11 11.03   - 3 02 11.0    18
          24.4549     14 22 51.76   - 1 12 01.1    18
     July 15.3944     14 57 34.19   + 1 03 44.5    18
          16.3958     14 59 20.68   + 1 05 53.5    18
          18.3542     15 02 50.28   + 1 09 17.7    18
          23.3972     15 11 58.33   + 1 13 03.2    18

     The following improved elliptical orbital elements, by the
undersigned, are from 7 observations from June 16 to July 23:

       T = 1979 May 26.9945 ET
   Peri. =   0.2420                   e =   0.518164
   Node  = 230.162  1950.0            a =   3.349850 AU
   Incl. =  22.6637                   n =   0.160756
       q =   1.614080 AU              P =   6.13 years


LUNAR OCCULTATION OF (4) VESTA ON 1980 JANUARY 24
     T. L. Mullikin, Indiana University, and L. H. Wasserman,
Lowell Observatory, write: "As indicated in the Phenomena section
of the A.E., there will be a lunar occultation of (4) Vesta on 1980
Jan. 24.  Observers in Greenland, Iceland, northwest Asia and Europe
(except the extreme southern portions) are favorably positioned.
For an adopted occultation velocity of 0".3 per second, the
event should last ~ 0s.5.  Below are the limits of the lunar shadow:

                              Sunset               Moonset
                          lambda    beta      lambda     beta
     Southern limit      +20o.08   +33o.52    -44o.14 +44o.86
     Northern limit      +102.07   +70.99     +138.96 +78.84
     Center line         +32.51    +50.83     -59.02 +63.73

Vesta will be mv = 7.9, and the moon will be at first quarter.
High-speed photometry of the event should yield an extremely accurate
determination of Vesta's diameter.  Computations are based on
data from the A.E."


1979 August 6                  (3389)              Daniel W. E. Green

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