Refer link

http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/ucac


I have read this news in the same link:

" UCAC4 News:

2013 Mar 10, UCAC4 streak objects: Some objects in the UCAC4 catalog are already classified as "streak objects". In an effort to identify artifacts in the catalog this issue has been further investigated by others; see for example here.
http://www.ap-i.net/skychart/en/news/ucac4_streak "

Now the question:
how is it possible to check whether artifacts,
that is streaks, are present in Guide 9 or Guide 8?
Is there a way to check the possible presence of artifacts in the catalog UCAC4 used in Guide (version 9 or 8)?

Many thank for help!

Regards!

Alfredo Caronia