[Aavso-photometry] IL Aqr: Campaign Update 041020B

[Aaron Price]

 The 3-sigma window is open. Observing has begun!

== Coordination ==

  As you begin observing please post to the discussion group so we can
keep track of who is on the field. As the data gets submitted to me
I'll begin posting light curves on the web site. I'll be checking
e-mail consistently between now and the end of the 3-sigma window on
15:27 UT Oct. 23.  If you notice any strange activity (like a flare)
please post ASAP.
  Remember, the home for this campaign is this web page:
                                          http://www.aavso.org/news/ilaqr.shtml

== Variability ==
  A quick fourier analysis of the ASAS-3 V data from Nov 22, 2000 -
Oct 5, 2004 (206 obs/~1 obs per week cadence) does not confirm the 20
and 28d periods reported by Weiss in 1994. However, a signal that is
just barely significant enough to warrant investigation is revealed
around 38 days. Interestingly, it has an amplitude (0.028 +/-
0.018mag) that matches within error the amplitude of the 2.8y period
Weiss reported. Remember Weiss' data was unevenly sampled. It is
important that even if you cannot participate in this observing
campaign to please try to get an observation of IL Aqr (at least in V)
every clear night until the end of the year. A plot of the fourier
power spectrum is here:
                                  http://www.aavso.org/tmp/ilaqr/freq.html 

== Airmass ==
 Re: that airmass calculator I posted in the last update. Use the
sec(z) column as your airmass number. I still hope to eventually post
an airmass tutorial and a simpler online calculator soon. I have it
already 95% written but, as always, that last 5% is taking the longest
time.  (If anyone has perl code to calculate LST drop me a line, I
can't get Astro::Time to do it right.)

-- 
Aaron