[vsnet-newvar 500] Re: [vsnet-chat 3404] Re: HadV62 = V1901 Sgr?

[Taichi Kato <tkato>]

Re: [vsnet-chat 3404] Re: HadV62 = V1901 Sgr?

> >From CCD image and DSS images taken at 1987-1993, no large proper
> motion cannot be found for HadV62 = USNO 0600.34669000 (183218.31
> -263013.3).

   What about the 2000 (i.e. recent Kyoto) images?

> I guess it is identical to V1901 Sgr (12.3 - 16.1 P).  
> The period (142.6 days) can explain the brightening on 1996 Aug, 1998
> March (4 periods later) and 2000 Jun (more 3 periods later).  

   I feel the identity of HadV62 and V1901 Sgr is established.  The main
source of discrepancy apparently came from 1) the distortion of Hoffleit's
hand-written chart and 2) the apparent blue color in Tycho-2.

   The first reason was unavoidable, since the chart was to simply show
the relation among the neibouring stars.  But what was the cause of such
a blue color (and apparent lack of variability, small quoted errors)
in Tycho-2?

Regards,
Taichi Kato

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