During the second quarter of 1993 I completed the paper on the 
spectroscopic binary eta Andromedae, which I submitted to the 
Astronomical Journal. Work on the astrometry paper continued, including 
an extensive investigation into the effect of water vapor fluctuations 
on our delay data. I also sent a letter to the HIPPARCOS astrometry 
satellite project leader, M. Perryman, asking for precise positions of 
those stars which we had observed for a comparison. 

I started to do the final analysis of our data on the spectroscopic 
binary Capella. Due to instrumental effects - related to the enormous 
brightness of this star - which were not accounted for initially, much 
of the original raw data had to be reduced again. The data also had to 
be re-calibrated. With our data, I was able to improve much on the 
precision of the orbital elements of this binary. However, there appears 
to be no unique set of component magnitude differences and diameters 
which would fit all the data equally well. I have begun looking into the 
possibility of non-uniformities in the brightness distribution of the 
primary component affecting our data. The primary of Capella, a G-giant, 
is super-rotating and it is likely that large fields of star spots are 
present in the photosphere. 

The paper on "A massive binary black hole in 1928+738?" by N. Roos, J. 
Kaastra and myself was published in The Astrophysical Journal, 409.