[vsnet-chat 1792] Re: some more MISAO objects

[Seiichi Yoshida <seiichi@muraoka.info.waseda.ac.jp>]

Dear Brian,

>      I had a look at these objects on he DSS in hopes of finding out what
> sorts of things are being noted as errors by the MISAO system.  All except
> two in the present list appear to be "blank sky" on the DSS, suggesting
> they are emulsion flaws of some kind or dirt present when the plates were
> scanned.  The object at RA 160635.6 is a piece of a diffraction spike from
> a bright star to the north.  The object at RA 185835.1 is a galaxy with some
> faint stars superposed; these often (usually!) have erroneously bright
> magnitudes in both the GSC and USNO-A.

Thank you for your comment. Unfortunately, I cannot see the DSS easily 
because I cannot access to WWW always. But your message implies that
we can check if an illegal data in the GSC and USNO-A is really an
"error" or a real faint object by looking at the DSS image. Actually,
MisE.UA1.00056 (the object at RA 185835.1) can be found on our images
as an extremely faint and diffused object. But I cannot determine it
is a real object or not only based on our images. I registered it as
one of the MisF (MISAO faint) objects. Thank you for your work!

>      It might be instructive for others to examine the errors on the DSS or
> other images to see if a flaw or real object is sometimes in the correct
> place.  This will help folks understand the sorts of problems that can
> occur with any sort of digital images (scanned plates/films, CCD frames).

Sorry, I cannot understand your message above. Do you mean,

  ... we can check if an illegal data in the GSC and USNO-A is really
  an "error" or a real faint object by looking at the DSS image.

as I write before?

Best regards,

--
Seiichi Yoshida
seiichi@muraoka.info.waseda.ac.jp
http://vsnet.info.waseda.ac.jp/muraoka/members/seiichi/index.html

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