Most of the time of the last quarter of 1993 was spent on matters of 
software development for the new interferometer. I extended the sparse 
matrix solution program (which I mentioned in my last report) to include 
the calculation of eigenvalues, which provide a measure of the 
"numerical stability" of the matrix. I also wrote example programs to 
demonstrate the use of the HDS data base subroutines with data of the 
Mark III. (HDS will be the data base software for NPOI data). I started 
to familiarize myself with the PV-WAVE data analysis software, which was 
bought recently by the project. I wrote example programs to demonstrate 
the process of linking C-programs, written by the user, to PV-WAVE.

I got the stellar positions of the twelve stars we observed with the 
Mark III from the HIPPARCOS team. The comparison shows that Mark III 
results and HIPPARCOS results agree in general at the 20 mas level. Even 
though this is slightly worse than expected, it is very encouraging 
considering the fact, that these so completely different instruments 
(the one an earth-based interferometer, the other one a satellite with a 
measurement grating) arrive at very similar results. As of the end of 
this quarter, we are still waiting for the referee comments on the 
our astrometry paper, which was submitted in the last quarter.

The Capella paper was accepted for publication in AJ (with minor 
modifications).

From November 15 to 23 I was in Arizona on the site of the NPOI to help 
with the feed beam assembly.

From December 13 to 31 I took a vacation in Germany. During this time,
I went to Bonn to the Max-Planck-Institut for Radioastronomy in order to 
work a little bit on VLA observations I had obtained the last year.