[vsnet-chat 3347] re NSV 6397 field

[no name <crawl@zoom.co.uk>]

I cannot comment on the quality of the co-ords of NSV 6397 itself...

...however, here's the J2000 co-ords for the GSC star and nearby
objects:

RASS-FSC object is

1RXS J134208.5+270941   with 11 arcsec error

GSC 2001 0217

13h42m08.5s +27d09'39.5"  [SERC V 14.9]

Lyons-Meudon MIGAL galaxy MIG1768212

13h42m08.5s +27d09'39.0" [Total B mag 17.2]

QSR RRS IV 4 [a quasar]:

13h42m08.4s 27d09'32" [V mag 19.0]


SO, it seems that a galaxy and a GSC "star" are probably the same
object, especially if the GSC mag is based on measuring an extended
object of around 0.3' size as a point source star [hence being about
estimated V mag 15 instead B mag 17, there's usually about a mag or so
difference twixt V and photographic mags anyway].

About 7 arcsecs below this lies a quasar position, which is fainter
still.

The RASS-FSC object position is barely 2" North of the GSC

If the NSV object has a bad position it could be the quasar object, but
I'd reckon if the GSC star is the MIGAL galaxy, then the quasar is not
necessarily the same object and just in the same line of sight.  This'd
make more sense of the magnitude discrepancies.

[Being in the same line of sight wouldn't preclude it being next to the
galaxy in space, which is the sort of thing that would have made Arp
happy! ;) ]

John

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