[vsnet-chat 4615] Re: V589 Her

[aah@nofs.navy.mil]

Gianluca posted his astrometry from his images of
the outburst; Yamaoka-san posted his astrometry from
the same images.  They differ slightly, due to the
different reference catalogs and reduction procedures,
but both are within their errors (I assume anyway;
Yamaoka did not give any errors for his reductions;
I would not believe the extra digit of precision until
I saw formal errors). I don't think there is any relevance
to Gianluca's measurement being closer to the blue USNO-A star's
reported position.
  Note that both of these positions match within
error to the one shown in Bruce Sumner's sequence
(from my .dat file; USNO-A2.0, 0.1arcsec internal
precision, posted May 9):
http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/sumner/v589her.seq
16 22 07.15  +19 22 37.2   Gianluca
16:22:07.164 +19:22:36.91  Yamaoka
16 22 07.17  +19 22 37.1   Henden
16 22 07.15  +19 22 37.4   USNO-A blue star
It is nice to see agreement!  This is obviously not a high
proper motion star.  Since Yamaoka-san notes a fainter companion,
you should be careful on your photometry as the CV fades.
  I've copied this to -chat as continued discussion of
the position is probably not relevant to -alert.
Arne

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