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IAUC 3818: Occn OF HYD -22 58794 BY NEPTUNE ON 1983 JUNE 15; 1983f; 1982k

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                                                  Circular No. 3818
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


OCCULTATION OF HYD -22 58794 BY NEPTUNE ON 1983 JUNE 15
     Using additional astrometric observations by A. R. Klemola
with the Lick double astrograph, D. Mink has updated the original
prediction (Mink, Klemola and Elliot 1981, A.J. 86, 135) for the
occultation of Hyd -22 58794 (V = 10.5, K = 7.0) by Neptune on June
15.  The correction to the relative position of Neptune and the star,
Delta-R.A. = -0".28, Delta-Dec. = -0".29 (the uncertainty in Dec. being
less than 0".1), indicates that the center of Neptune's shadow will pass
near the earth's south pole.   Times of immersion range from 14h24m
UT (Hawaii) to 14h30m (Java), and durations (the maximum possible
being 35 min) range from 34.25 min in New Zealand to 30.50 min in
Japan.  Although the possible error in the predicted immersion
time is less than 2 min, observers should start recording data at
least 30 min before the event.  Predictions for specific locations
are available on request from Mink at the address Room 37-556,
Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A.
(telephone 617-253-7556).  Interest has been expressed in looking
for the possible ring, very close to Neptune, recently claimed as
the result of data from the 1968 occultation.  Should this ring
exist, its shadow will be observable north of latitude -20 deg south,
from Hawaii to west of China.


COMET IRAS (1983f)
     J. Gibson provides the following positions, obtained with
the 1.2-m Palomar Schmidt.  The May 18 plate was taken by C.
Kowal.  The May 18 and 20 images were weak with the moon nearby.

         1983 UT              R.A.    (1950.0)    Decl.

         May  18.18200       9 15 52.53      -12 49 09.7
              20.17054       9 15 44.30      -11 57 00.2
              31.177         9 16.76         - 8 06.5


PERIODIC COMET KOPFF (1982k)
     Total visual magnitude estimates: May 5.15 UT, 10.1 (J. E.
Bortle, Stormville, NY, 0.32-m reflector); 9.23, 10.5 (C. E.
Spratt, Victoria, BC, 0.20-m reflector); 13.12, 9.1 (Bortle);
14.98, 9.4 (J. D. Shanklin, Cambridge, Eng., 20 x 80 binoculars);
17.89, 9.4 (J.-C. Merlin, Le Creusot, France, 0.26-m reflector).


1983 June 1                    (3818)              Brian G. Marsden

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