Since IOTA uses the UCAC4 catalogue and not UCAC3 for asteroid occultation predictions, and since VizieR states that UCAC3 has been superseded by UCAC4, I decided to take the plunge and try to coax Guide into using and displaying the UCAC4 catalog instead of UCAC3.

After trying carefully to follow all the instructions given in Grant Blair’s thread on UCAC4 on this forum late last year, I am still not able to get UCAC4 to display.

I downloaded the UCAC4 catalog from Vizier (~9 Gb) and copied the contents of the entire UCAC4 directory to c:\guide9\ucac4, as shown here:

http://skythisweek.info/ucac4dir.png

And, here are my settings and screen shots that should be helpful:

http://skythisweek.info/startup.mar

http://skythisweek.info/guide.dat

http://skythisweek.info/datasetstotoggle.png

http://skythisweek.info/ucac4options.png

Thanks much for any assistance you can provide.

David Oesper