[vsnet-chat 5168] (fwd) Re: About courios observation, big confusion (from Samus)

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

(fwd) Re: About courios observation, big confusion (from Samus)

Date: Thu, 28 Feb 2002 09:38:36 +0300 (MSK)
From: "Nikolai N. Samus" <samus@sai.msu.ru>
Subject: Re: [vsnet-id 611] About courios observation, big confusion (fwd)


---------- Forwarded message ----------
Date: Thu, 28 Feb 2002 09:35:04 +0300 (MSK)
From: Nikolai N. Samus <samus@lnfm1.sai.msu.ru>
To: Toni Scarmato <toniscarmato@hotmail.com>
Subject: Re: [vsnet-id 611] About courios observation, big confusion

Dear Tony Scarmato,

It seems to me you don't read VSNET messages you receive. Only yesterday,
I explained the VSNET users that the version of the GCVS with accurate
coordinates for the GCVS Volume II (Cygnus - Orion) was NOT YET RELEASED.
The version you have shows a (:) sign with coordinates, clearly indicating
these are OLD UNVERIFIED coordinates. However, we already do have
accurate coordinates for variables in Hydra and probably will
introduce them in our web GCVS version later this year. Your
identification of FH Hya with GSC 4900.329 is correct. The Megastar
position is not good. I'd recommend something like the following (equinox
2000.0, epoch 2000.0) position derived from Tycho2 data:

09 34 01.765 -06 59 18.46

with the proper motin in RA and Dec +0".0015, -0".0056.

Best regards
Nikolai Samus

On Wed, 27 Feb 2002, Toni Scarmato wrote:

> Dear all,
>
> I Have received just today the diskettes with the GCSV and NSV catalog from
> the President of AFOEVB Association.
>
> I am verifying some observations and I found the first surprise.
>
> The position of the variable star HYAFH=GSC 4900:329 (12.2/0.4)
> reported in GCSV in Megastar program
> is 09 34 0.9 -06 59 04 (LB Type) 10.0-10.5 p
>
> Instead, the position in catalog received is
> 420172 |FH    Hya  |093132. -064542:|                |LB        | 10.0    |
> 10.5      |P |            |     |                    |     |K-M
> |00351 08953|
>
> I Have verified that the correct position seem to be the first. On my images
> at second position seem visible a faint star with a magnitude fainter then
> 12.5.
>
> Moreover, the measure of p magnitude of the star at first position give the
> following results
>
> HYAFH 20020211.908 11.187 p TSc (+/-0.45)
> HYAFH 20020211.911 11.054 p TSc (+/-0.23)
>
> fainter then  magMin 10.5 p of  HYAFH and brigther then 12.2 of GSC4900:329.
> If need I will send the images.
>
> On the other hand, on images, the star appear of orange coulor and
> comparison with the near star
> GSC 4900:477 9.8/0.4 and GSC 4900:491 10.3/0.4, the different magnitude is
> well visible.
>
> What is the truth?
>
>
> Best regards,
>
> Toni Scarmato
>
>

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