Data in WebbObs not accessible to VStar or Light Curve PLotter

I know you meant to say LCG rather than VSP Robert. :)

Indeed, compare https://www.aavso.org/apps/webobs/results/?obscode=YCRA&num_results=25&obs_types=all with what you get for a current plot of V0645 Cen.

Given that both LCG2 and VStar use the same AID web service now but that I suspect WebObs talks to the database server side directly, it may be the web service.

I'm on my way home from work and have not had a chance to look at the web service response directly but it's certainly the case that the data does not appear to load in VStar either.

David

Just looked at the web service response and noticed that the observations in question are being submitted with a MType of DIFF instead of STD, e.g.

https://www.aavso.org/vsx/index.php?view=api.object&ident=000-BCV-333&data=10&fromjd=2457930

vs

https://www.aavso.org/vsx/index.php?view=api.object&ident=000-BCV-333&data=10&fromjd=2457924

so LCG2 and VStar won't display them.

There are ~140 such recent observations in the AID I think.

David

Hi Robert,

David hit the nail on the head. These observations of V645 Cen by YCRA were reported as having differential rather than standardized magnitudes (meaning that the magnitude of the comparison star was not included in the equation). Since this is like plotting apples and oranges, such observations do not belong on the same plot as the ones with regular standardized magnitudes and they are not displayed in VStar or Zapper at all. You actually can see them in the new Light Curve Generator if you select "Differential Magnitude" from the drop-down list in the "Plot another curve" window.

If there is any confusion about the definition of "standardized" versus "differential" magnitudes, please see page 46 (Chapter 5) of the CCD Photometry Guide which explains it.

-Sara

Thanks David, Sara and Elizabeth for sorting this out.  It would have been a real shame it all of Craig's work got lost in a definition.

Robert