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(fwd) Re: [vsnet-chat 5996] Re: CCD-V Vs visual observations The following message is from Richard Berry: Hello Taichi-- > > However, please note that all of the original information from > > the image is reproduced in the data record. The date and time > > are preserved, and are not altered in the calculation of the > > Julian Day. This means that you can independently compute > > the Julian Day when you use the data. > > Okay, this is a nice feature. I should also point out that observers only see the JD text boxes if they enable the "Compute JD" checkbox. If this box is unchecked, JD options are not seen. > However, would there be a special reason > to calculate JDs to 10^(-8) d (about 1 ms)? This value is output from a carefully tested routine. We do not truncate or otherwise tamper with that result. And yes, it is obviously too many significant figures. I have been watching the discussion of R CrB fading. Why is this star not a target for CCD imaging? It would be very easy to make images with a small short-focus lens at 1 minute intervals, and the result would be impersonal and free of the devastatingly huge scatter in the visual estimates. --Richard Richard Berry
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