Tom,

The UCAC3 tdf is for Guide 8 only.

The UCAC4 tdf is in the update found at
http://www.projectpluto.com/new.htm

UCAC stars in Guide 9 are on average from 12 to 16 magnitude only.

UCAC4 star - 4UC713-010273
UCAC3 star - 3UC254-117323

When you turn on the UCAC4, you will not see the UCAC3 when UCAC4 are
displayed. I recommend under "Display" settings in "show at" from "0 -
2" degrees to show UCAC4.

in your Guide 9 folder, you can find ucac3 folder which is from the
install Guide 9 DVD. These have been modified by Bill and are not in
Guide 8.

Hope this help.

Bill, correct me if I am wrong.

Denis

On 08/10/2012 8:11 AM, tom wrote:
> Hi,
>
> If I right-click on a star, Guide9 identifies the USNO star as
> "A2_XXXX_xxxxxxx so I know these stars are from the USNO-A2 catalog. Can
> someone explain to me which stars are from the UCAC3/4 catalog?
>
> Tom
>
>
>
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