[vsnet-chat 4549] re UCAC1 mags and USNO colours : accessibility thereof.

[crawl@zoom.co.uk]

Hi Berto and whomever else is interested.

Berto Monard wrote:

>A catalogue combining UCAC1 and USNO-A2.0 data would go far in helping to
produce V values ... for the amateur.

You go to :-

http://cdsweb.u-strasbg.fr/CDS.html

Click on the Aladin link at the top

wait for the JAVA online stuff to load

then load an image of your field from any survey

then load and overlay usno A2.0 stars for that field via VizieR tab in the
load dialogue

then load and overlay ucac1 stars for that field from same VizieR tab

these will be different coloured symbols.

Heck , you can even overlay 2mass positions, msx5c positions, gsc 1.1, 1.2
or ACT positions, and hopefully in a coupla months GSC2.2 ones, and all
SIMBAD contained objects, and just click on the symbols and get full
details in a status at bottom, and even follow links from these to other
bits of the CDS VizieR, SIMBAD or bibliographic services, and from the
latter then on to the ADS and the actual papers, and so on, and so forth, etc!

Anyway, that way you can see ucac1 mags and usno A2.0 colours together all
at once easily identifiable as the same star from the survey plate image
objects you are using to overlay them upon.

It seems to be a seriously under used top quality facility does this.  I
even used it to plot up mis V0380 [in SIMBAD] and the msx5c candidate [in
VizieR] and the MAMA CAI digitized DSS2 plates [part of Aladin, and the
only easy source of the MAMA CAI digitizatoins that I know of] the other day.

And you can export the lot to a bitmap graphics file on your harddisk, or
fits if you must.

John

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