Search for missing data for stars already in a bda file
This facility is the opposite of that described in the
previous item. It answers,
for example, the question: "which are the stars that have UBV
data, but no coordinates?"
It helps finding for which stars the requested data are missing.
This is done with the command aud
and the option -v and the full command:
aud -v "type 1" "type 2"
- "type 1" is the data type
corresponding to the star number source,
- "type 2" is the data type corresponding to the data looked for.
Example:
aud -v cmd coo
- displays the list of stars which have UBV data
in the database (type cmd), but no coordinates (type coo).