[Aavso-photometry] Possible new variable? (corrected)

[Dave Lane]

Jeff Hopkins wrote:
> 
> And what does that tell you about the error for the program star 
> measurements?

Hi Jeff,

It actually tells us a lot, particularly when a few check stars are 
measured, since they was exposed at the same time as the program and 
reference star through the same airmass with the CCD at the same 
temperature and with the same read-noise. Arguably if one of the stars 
was sitting on top of a particularly noisy pixel or a cosmic ray hit.

My processing pipeline that processes the data automatically also 
produces several diagnostic measurements for each star measured. These 
include airmass, FWHM, background level, S/N ratio, maximum pixel, 
integrated intensity, and of course differential magnitude. One can 
easily scan down a list of measurements and pick out the ones that had 
issues with guiding, clouds, focus, transparency, etc. They could be 
treated separately (or just tossed out).

--- Dave

ps. last night's data shows the new variable continuing to vary, now at 
the 0.05 magnitude range 
(http://www.davelane.ca/aro/images/20071212-lph058v.gif)