508Re: [vsx-dis] VSX "AAVSO LCG" URLs are built incorrectly
- Jan 27, 2011FYI
The time span does need IMO more discussion:
ASAS plots by default all obs they have. This is unpractical for the AAVSO
obs span a much longer time.
If one does just consider LPVs, one could choose a time span of up to ~
20 years to get still nice LCs for most of these stars.
One cann't consider short period EBs and pulsators for this. Maybe even
But one should at least consider SRs and RVs with their usually much
shorter periods too.
gnuplot (that is used for the LCG plots) creates plots with always 4 major
time ticks and 2 or 5 minor time ticks per major time tick.
So if someone wants to get easily readable, whole, round time valuess
for the JD time axis, they should choose the time span of the LCG plots
to be a multiple of 8 or better a multiple of 20.
Choosing 3000d (~ 8 years) for the time span gives major time ticks every
750d and minor time ticks every 150d. Not really odd numbers, but IMO
choosing 4000d (~ 11 years) with 1000d and 200d time ticks, or 2000d
(~ 5.5 years) with 500d and 100d time ticks, or 1000d (~ 3 years) with
250d and 50d time ticks would be better.
When considering medium period SRs and RVs, I plead for a time span
of 2000d (~ 5.5 years) for the LCG plots. This should be sufficient also
I would eithe just let plot V, vis, unvalidatred xor also enable the plotting of
R and I too beside U, B, V, vis, unknown, unvalidatred.
Wolfgang Renz, Karlsruhe, Germany
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