Re: Mark IV data off by one day

["Gary W. Billings" <obs681@telusplanet.net>]

Good work!  I agree the correction improves the fit, but I see there are a
couple of datapoints, presumably from other nights, that phase to times of
primary eclipse but do not show any dimming...

g.


----- Original Message -----
From: "Patrick Wils" <patrickwils@yahoo.com>
To: <tass@listserv.wwa.com>
Sent: Friday, June 11, 2004 5:59 PM
Subject: Re: Mark IV data off by one day


> --- Dirk Terrell <terrell@boulder.swri.edu> wrote:
> > Another idea might be to look at known detached eclipsers with
> > several-day periods and reasonably deep eclipses to see if you might
> > have caught them in eclipse. They'd tell you if you had a one-day
> > error.
>
> I have plotted NSVS and TASS data for the EA type star SU Boo using Bob
> Nelson's ephemeris HJD Min = 2452667.9434 + 1.56125 * E
> (http://binaries.boulder.swri.edu/omc/SU_Boo_OC.xls.htm).  According to
> this ephemeris, SU Boo should have had an eclipse at JD 2453109.78.
> The TASS database shows it faint near JD 2453108.77 but not near JD
> 2453109.78.  Adding 1 day to the JDs of the 5 data points concerned,
> gives a better fit to the ephemeris.
>
> Patrick
>