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Re: [vsnet-chat 6014] Re: [AAVSO-DIS] Re: v1413 Aql - Ready for Eclipse > Certainly, even if one makes a dubious positive observation at a 5% rate > or less, its accuracy would be much lower than the normal +/-0.1 for > visual. Not all visual observers are in persuit of 0.1 mag accuracy. Some people are in persuit of 0.01 mag, and others are satisfied with 1 mag accuracy. By the way, what time bins should we adopt to calculate the entire observing time? (Just because I don't have a correct photon number V-mag conversions on the retina) If you refer to 100ms time-constant for the time bins, 100s corresponds to 1000 bins. Then you can expect 50 detections for a 5% rate. The 1-sigma statistical error of 50 detections is 7 = sqrt(50), indicating that the relative error is 7/50, corresponding to ~0.15 mag. For 1% detections, the error becomes ~0.3 mag, wouldn't it be reasonably small?? If this estimate is true, the required observing time is extremely reasonable for actual visual observation. [As the first approximation, I neglected contributions from the sky background, but would be easily estimated in the same way]. Regards, Taichi Kato
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