Back to Home

XEphem Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | XEphem Ephemeris Software Discussion | Post

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Re: Re: Re: Xephem Catalogs

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Elwood Downey on December 21, 2000 18:37:34 UTC

I have not tried this .edb version of the Tycho catalog but one explanation might be a mismatch in proper motion epochs. The .edb format does not contain the proper motion coefficients so the positions are fixed at some moment (hopefully the preparer of the .edb version moved all positions forward to the same moment) and then this moment is almost surely different than that of any other comparison catalogs.

Again, I have not had a chance to look at the .edb file under discussion, just wanted to toss out this possibility.

Happy holidays...


Follow Ups:

Login to Post
Additional Information
About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
Unless otherwise specified, web site content Copyright 1994-2024 John Huggins All Rights Reserved
Forum posts are Copyright their authors as specified in the heading above the post.
"dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
are trademarks of John Huggins