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IAUC 6429: 1996 N1; SS Lac; R CrB

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                                                  Circular No. 6429
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET 1996 N1
     Additional precise positions:

     1996 UT             R.A. (2000) Decl.       Observer
     July  4.85856   11 35 28.28   + 4 42 27.8   Koleny
           4.86485   11 35 29.38   + 4 42 49.8     "
           4.87268   11 35 30.75   + 4 43 17.1     "
           4.88944   11 35 33.54   + 4 44 18.1   Ewen-Smith
           4.89104   11 35 33.79   + 4 44 23.0     "
           4.89288   11 35 34.12   + 4 44 30.0     "
           4.89369   11 35 34.27   + 4 44 32.6     "
           4.89455   11 35 34.58   + 4 44 33.6     "
           4.89770   11 35 35.01   + 4 44 45.4     "
           4.90010   11 35 35.40   + 4 44 55.9     "
           4.90085   11 35 35.55   + 4 44 56.9     "

P. Koleny and L. Kornos (Modra).  0.6-m f/5.5 reflector + CCD.
B. Ewen-Smith and D. Farley (Portimao).  0.5-m reflector + CCD.


SS LACERTAE
     P. B. Etzel, N. H. Volgenau, and Q. T. Nguyen, Department of
Astronomy, San Diego State University, communicate:  "We have
observed, for the first time, a double-lined spectrum of SS Lac (BD
+45 3782) with the 1.0-m Cassegrain spectrograph at Mount Laguna
Observatory.  Schiller et al. (1991, BAAS 23, 879) discuss the
cessation of eclipses in this system; their twelve spectra obtained
during 1982-1984 revealed only single lines and no detectable
radial-velocity variation.  Schiller [1996, Astronomy 24(7), 46]
recently proposed that the two components were disrupted by a third
object and sent into trajectories perpendicular to our line of sight.
Our spectroscopic observation provides a velocity difference of 174
km/s between the components on 1996 July 1.47 UT, corresponding to
orbital phase 0.78 from the eclipse ephemeris of Dugan and Wright
(1935, AJ 44, 150).  Thus, SS Lac is probably still a binary system,
which we are continuing to observe."


R CORONAE BOREALIS
     Visual magnitude estimates by M. V. Zanotta, Milan, Italy (cf.
IAUC 6260):  Apr. 16.92, 12.2; May 21.09, 9.3; June 10.88, 8.5;
July 3.85, 8.1.

                      (C) Copyright 1996 CBAT
1996 July 4                    (6429)            Daniel W. E. Green

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