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I think we have to be careful in our reductions and not reject observations as they don't seem right. A star may be doing something weird and the observations will be quite valid. Cheers Peter Nelson ----- Original Message ----- From: <BailyHill@aol.com> To: <lolife@bitstream.net>; <tkato@kusastro.kyoto-u.ac.jp> Cc: <aavso-discussion@informer2.cis.McMaster.CA>; <vsnet-chat@ooruri.kusastro.kyoto-u.ac.jp> Sent: Wednesday, February 12, 2003 12:39 PM Subject: [vsnet-chat 5975] Re: [AAVSO-DIS] CCD-V Vs visual observations > > In a message dated 2/11/03 12:14:24 PM, lolife@bitstream.net writes: > > << For non-survey type CCD observations it just baffles me why anyone > would submit any observations that were not as careful and as correct > as possible. Observations are worse than useless if you don't take care > in the reduction and reporting. >> > > I guess I would like to hear what steps other folks are taking to make sure > that their observations are as correct as possible. > > What checks are being made? > > How many comp stars do you use? > > How large a spread of your estimates between comps stars do you allow before > you reject an observation and not submit it? > > Do you look at your previous observations of the same star to make sure that > the current estimate is not too far off? How far off is too far? > > Do you look at the quick look file or the light curve generator and see what > a star is doing to make sure that your observation is not too far off? > > What do you do with a CV that is in outburst and you are the only observation > in outburst and your estimate is 1-2 magnitudes brighter than typical that > previous observations in the light curve generator? > > Suppose a star is an LPV. Your observation differs from the last one, 10 > days ago in the quick look file. How large a deviation would you accept > before discarding it. > > How much apriori information do you collect to make sure that every > observation is within limits. How big are your limits? What type of star do > you impose this process on? > > What other suggestions do you have for screening observations? Specific > things you do. I am sure that everyone want to turn in accurate data. What > is needed is a set of guidlines. I would like to hear just what others are > doing. > > Clear Skies > > Gary > >
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