--- In [email protected], Patrick Chevalley <p...@...> wrote:
>
> Hi,
>
> Yes, UCAC3 is available now but I suggest you not rush to ask a DVD, the USNO
> as probably better thing to do than sending DVD to every amateur astronomer
> on earth.
>
> I not want to add direct access to this DVD from CdC for the many reason
> invoked when I choice to use Catgen for any future catalog in CdC V3.
> But I plan to make smaller downloadable version for use with CdC. This will
> be probably more useful for most people here.
>
> This catalog is big, 100 millions stars, it is probably the most useful ever
> produced for the amateur astronomer, so its use on CdC need to be carefully
> planned.
> I want to ask your opinion before to start and provide some small test file
> to be sure all work fine before to upload the big chunks.
>
> Use this tread to discuss about what you want to be include in this catalog
> or what you not want to save space.
> We can also use other tread for specific issues, I start two after this
> message about stars identifiers and photometry.
>
> You can get all the information about the catalog content on this page,
> please read carefully:
> http://ad.usno.navy.mil/ucac/readme_u3.html
>
> My first idea is to produce two version, one the most compact as possible to
> produce nice field map. The other more complete with identifier and search
> index but also a bigger download.
> Remember that each character of information we add increase the download of
> 100 MB!
>
> UCAC3 compact :
>
> Include fields:
> RA, DEC, pmRA, pmDEC, Mag : 1.5 GB
> or
> RA, DEC, pmRA, pmDEC, Mag, B-V : 1.7 GB
>
> So it can be tree files of about 500 MB each with South, Equator and North
> downloadable and installable separately.
>
>
> UCAC3 with ID , index and maybe other need informations :
>
> Include fields:
> ID, RA, DEC, pmRA, pmDEC, Mag, B-V : 2.6 GB
> +
> 100 MB / char, 400 MB / numeric value,
> +
> index size is nbrec * (8 + keylength) : 1.7 GB
>
> Except the index the download can be split in 500 MB to 1 GB parts.
>
>
> Any idea on this ?
>
> Patrick
>
Would it make sense if it´s possible to add this ctalog to the online-resources?
Charlyms
