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Introduction

Dave Herald's winoccult is the standard tool used to predict occultations of asteroids by stars and other types. Dave has created an aggregate catalog which combines the best parts (for winoccult purposes) of the Tycho-2, Hipparcos and UCAC2 catalogs. To faciltate planning of occultation observation attempts I wanted to have the same catalog available for the planetarium program I use, Cartes du Ciel  .

I wrote a small gcc program that reads the binary catalog and converts it into a text file. Cartes du Ciel has a utility to convert formatted text files into binary catalogs, catgen. I then created a project file for catgen to create the actual catalogs. The conversion utility should be compilable on Linux for use with the Linux version of Cartes du Ciel. Contact me if you would like the source code to try. Since I developed it under the Cygwin environment and because of the trivial nature of the code it should be a straight re-compile. Only Little Endian processors though (x86).

Process

Follow these steps:

  • Download tycho2.zip if you don't already have it.
  • Uncompress this in a temporary directory if you don't have it in Occult3\starcats yet.
  • Download winoccult2cdc-1.3.zip and uncompress in the same directory as tycho2.dat.
  • Run occult2cdc.exe. It will read tycho2.dat and create cdc_tycho2.txt in the same directory. It will be about 900MB large when done.
  • Start catgen and load occult2cdc.prj. The input path is likely incorrect, load the one you created. Pick a destination directory for the catalog and adjust other parameters if you're so inclined.
  • Create the catalog.

Version history

  • 1.3 : added a space between 2UCAC and the identifier
  • 1.2 : Changed TYC2 to TYC because that's how winoccult refers to Tycho 2 stars
  • 1.1 : fixed up some catalog ID processing
  • 1.0 : original


      

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