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IAUC 3312: Occn OF SAO 114159 BY (18); WZ Sge; P/SCHWASSMANN-WACHMANN 1

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                                                  Circular No. 3312
Central Bureau for Astronomical Telegrams
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

     O. G. Franz, R. L. Millis and L. H. Wasserman, Lowell Observatory,
report the following revision of G. E. Taylor's (1978, IAU
Comm. 20 Working Group on Occultations Bull. No. 13) prediction for
the occultation of SAO 114159 = AGK3 +60778 (mv = 7.7) by (18) Melpomene
(mv = 9.2) on Dec. 11.  The revision is based on nine plates
obtained with the Lowell 33-cm photographic telescope during Nov.
28-Dec. 3.  The maximum duration of the occultation will be 19s.

         UT      lambda     phi         UT     lambda      phi
        9 12.0   + 80.0    +33.8       9 18.0  +115.0     +38.9
        9 14.0   + 92.1    +35.7       9 20.0  +126.6     +40.1
        9 16.0   +103.6    +37.4

The formal standard error in the north-south direction is less than
half the track width of ~ 180 km.  They may be contacted at the
Lowell Observatory (telephone 602-774-3358) for details.  Further
last-minute information about the occultation may become available
from D. W. Dunham (telephone 301-585-0989) or W. Warren (301-474-
0814) in Maryland or from G. E. Taylor (032-181-3255) in England.

     A. Kruszewski, Warsaw University Observatory; and W.
Krzeminski, Copernicus Astronomical Center, Warsaw, communicate:
"E. Bohusz and A. Udalski observed WZ Sge on Dec. 3/4 with B and V
filters.  The nova apparently changes its light with an amplitude
of 0.3 magnitude in the V band and is of magnitude about 8.5.  Two
maxima were observed on Dec. 3.769 and 3.799 UT, separated by one
half of the orbital period."

     Visual magnitude estimates: Nov. 26.96 UT, [14.5 (J. Bortle,
Brooks Obs.); Dec. 1.96, 8.1 (Bortle); 3.03, 8.4 (Bortle); 4.2,
8.6 (P. L. Collins, Mount Hopkins Obs.); 5.10, 8.5 (Collins).

     C.-Y. Shao informs us that a 21-min IIIa-F exposure with the
Harvard Observatory's 155-cm reflector on Dec. 3.27 UT shows a
strong condensation (m2 ~ 13-14) in a bright coma (diameter ~ 1')
with a faint, broad, short tail in p.a. ~ 40o.  A 30-min exposure
on Nov. 1.31 showed the comet then substantially fainter (m2 ~ 15).

1978 December 5                (3312)              Brian G. Marsden

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