[vsnet-chat 5396] GCVS revision

[Seiichi Yoshida <comet@aerith.net>]

Dear colleagues,

I know there are two revision catalogs of GCVS positions.

    Gareth V. Williams's Revision Catalog of Variable Stars
    http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/others/GCVS_REV/williams

    Taichi Kato's Revision Catalog of Variable Stars
    http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/others/GCVS_REV/pat.srt
    http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/others/GCVS_REV/pat2.srt

I searched variable stars whose positions are very different from
those in GCVS2000:

  http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/gcvs/gcvs2000.all 

and found that positions of many stars have been revised, and to be
surprised, some of them have very large difference.

Here I introduced the stars whose position errors in GCVS2000 are
erroneous very much, 0.1 deg or larger.

I believe some of them in these revision catalogs are wrong data. 

For example, there are two records of AURLO in pat2.srt with very
different positions.

> AURLO P 2000 055723.900 +482241.62 USNO
> AURLO P 2000 232706.69 +453321.7 GSC_mean

The magnitude data of these stars may be confused in some database...

[*] williams

Star		Position Error(degree)
--------------------------------------
NSV01383	17.9
OPHV439		 8.5
CYGV1009	 3.2
HERV735		 1.1
PERV464		 0.7
PERBG		 0.3
NSV01212	 0.2
NSV14061	 0.2
COMGS		 0.1
LYRV367		 0.1
PERV339		 0.1
PSCAC		 0.1
VULHX		 0.1
NSV00054	 0.1
NSV00055	 0.1
NSV00063	 0.1
NSV00993	 0.1

[*] pat.srt

Star		Position Error(degree)
--------------------------------------
PERBG		 0.3
SGEBF		 0.3
AQLV973		 0.1

[*] pat2.srt

Star		Position Error(degree)
--------------------------------------
AURLO		64.8
CASV349		20.3
APSFZ		17.1
ORIV877		16.0
COMBQ		 8.3
NSV06722	 7.5
SGRV4168	 7.3
LYRV502		 5.2
CIRRX		 4.0
NSV11194	 0.6
SGRV4048	 0.2
OPHV854		 0.1
PUPIV		 0.1

Best regards,

--
Seiichi Yoshida
comet@aerith.net
http://vsnet.aerith.net/

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