Re: TASSJ165348.7+053411.3

[aah@nofs.navy.mil]

Michael K. wrote:
>Using J2000 this star is GSC 00393 00221. Using JNow it is in the middle 
>of nowhere, so I'm assuming it is the former.
  The difference between J2000 and current epoch (2002.5 or so) is pretty
small; can you explain your "middle of nowhere" comment?  I assume
your "Jnow" means "current epoch" and is not some term used elsewhere?

>My unfiltered  magnitude came out to be 12.4 and showed
>a slight curve as if it was near maximum.
  There are unfiltered magnitudes, and then there are unfiltered
magnitudes.  First, what magnitude system did you use for setting
the zeropoint in your field?  GSC? USNO-Ared? etc.  You should specify
your magnitudes as "CR" (clear, using R magnitudes for zero point),
"CV" (clear, using V magnitudes for zero point), etc.  Second, for an LPV,
it is unlikely that you would see any curvature in a single night's
observing window, especially with your 0.03mag errors.  Can you
explain this comment more as well?

>I'm told my CCD  is probably nearest to R or I than V, so if
>it was a strong infrared source, you'd think my measurement
>would be much closer to Tom's I.
  I don't know of *any* CCD whose unfiltered response is close to Ic.
The TC237 is probably reasonably close to Rc if you look at my M67 paper.
Also, I've been pretty lax, but since you are trying to use this
as a learning experience, please do not use the term "infrared" for
any CCD filter/bandpass.  The filter is just "Ic" or "far red".
Infrared means something entirely different to astronomers.  Perhaps
you really meant astronomical infrared, in which case you might indicate
your reasoning (did you find it in some IR catalog?).

John wrote, in response to MK's question:
>Anything wrong with just writing "possibly associated with 1rxs etc",
>given a negative result check has been made for any other association, I
>wonder ?
  That should be ok, though I would look at the DSS/VizieR and convince myself
there isn't something else more likely within the 26arcsec error radius.
It could be an AGN or a multitude of other Xray sources.
Arne