[Aavso-photometry] RE: [AAVSO-DIS] RE: AAVSO special notice 5 object

[Justin Pryzby]

> -----Original Message-----
> From: arne at aavso.org [mailto:arne at aavso.org]
> Sent: Sunday, February 12, 2006 1:56 PM
> To: Walt Cooney
> Cc: 'Aaron Price'; aavso-photometry at mira.aavso.org
> Subject: Re: [Aavso-photometry] RE: [AAVSO-DIS] RE: AAVSO special notice
> 5 object
> 
> 
> Hey, Walt!
> Why are you using USNO-B1.0 for the astrometry, rather
> than UCAC2?

On Sun, Feb 12, 2006 at 02:07:04PM -0600, Walt Cooney wrote:
> Unfortunately, I don't have a copy of UCAC2.  Astrometrica is so
> slick as to be able to download the B1.0 stars online.  B1.0 is a
> lot more accurate than my copy of A1.0.  UCAC2 would be far better.
> I haven't really kept up with the astrometric catalog world.  Is
> UCAC2 easily available for download somewhere?
Vizier of course has it:
  http://vizier.cfa.harvard.edu/viz-bin/VizieR?-source=ucac2&-c.eq=J2000&-oc.form=sexa&-c.r=%2010&-c.u=arcmin&-c.geom=r&-out.max=50&-out.form=HTML%20Table&-out.add=_r&-out.add=_RAJ2000,_DEJ2000&-sort=_r

The USNO link is
  http://ad.usno.navy.mil/ucac/

There is also NOMAD (Naval Observatory Merged Astrometric Dataset)
which includes UCAC2 data:
  http://www.nofs.navy.mil/nomad/

It is queryable from
  http://www.nofs.navy.mil/data/fchpix/
and
  http://www.nofs.navy.mil/data/fchpix/vo_nofs.html

Note that XML output is available, which means you can use any parser
to select just the data you want.

Justin