Celestia Forums

Celestia 1.3.2pre11 and the extended stars database - apparently there are loads of Tycho stars which do not seem to exist when searched for here.

An example being the star "TYC 1880-3357-0" near Omicron Persei.

After doing a query on the region around Omicron Persei, two Tycho references came up: TYC 2359-1258-1, which is Omicron Persei, and TYC 2359-1258-2, which does not appear.

Interestingly Celestia's star browser reveals several TYC stars with 0 at the end, and none with 2 at the end. As far as I know, NO Tycho reference exists with a final zero.

I am unsure about whether this is a fault of the extended database file, or a fault of Celestia's processing of Tycho catalog numbers.

It's evidently a problem with the extended stars database - your anomalous star is listed with a Hipparcos number of 0033571880 in the extended stars.dat, and Celestia is (consistent with its usual handling of encoded Tycho numbers) converting that to TYC 1880-3357-0. So the spurious star number has been generated in the creation of the stars database.
Maybe you should drop Pascal an e-mail to let him know the problem ... I don't know if he still hangs around the forum.

Grant