[Aavso-photometry] Re: RE: [AAVSO-DIS] Complete analysis of CCD accuracy for Var Her 04.

[Aaron Price]

> quality". But even in the 13-14 magnitude range the majority of
> observations do not meet the expected 0.02 mag or less CCD accuracy.
> Overall, 3/4 of the observations are worse than 0.02 magnitude.
>

 I don't know if 0.02 accuracy is "expected". Berry's book claims 0.03 is
considered good for most applications. In my experience consistent 0.01
accuracy is only possible by the most experienced AAVSO observers. I say
in the CCD Manual that the precision level a CCD observer should target
should be tailored to the observing program. For a program to monthly
monitor mira's, for example, 0.1 accuracy with a V filter is just fine. In
our campaigns I try to give the observers an accuracy range to target (ex:
for BZ UMA I asked observers to reach 0.03 because time sampling was more
important than accuracy for the phenomenon I was looking for). So I would
hesitate to say that any level of precision is "expected". What is
expected is what is needed for the specific campaign, which can vary.

Aaron