[vsnet-chat 1147] Re: EX Hya ephemeris

["William S G Walker" <astroman@voyager.co.nz>]

Taichi Kato,

Thanks for the updated ephemeris. What's the value and the sign of the
correction between HJD and TDB at the moment. Our eclipses appear to be
about 2-3 minutes early at the moment which I imagine is greater than the
correction - but well within the sinusoidal term.

The spin peaks now fit reasonably well, although on average they seem to be
coming  5 minutes late. But until we extract the eclises from the data this
is hard to tell. The last night measured was 2 August - when the star
looked rather disturbed when we examine it in retrospect. But the overall
brightness and amplitudes were much the same - about 0.9 magnitudes
overall. The spin hump amplitude this year has been up to 0.8 magnitudes
and the eclipses from 0.2 to 0.5. These are unfiltered ST6 which is about
R, I understand. But the eclipses should be deeper as the wavelength
shortens. 

Regards,
Stan
----------
> From: Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>
> To: vsnet-chat@kusastro.kyoto-u.ac.jp
> Cc: astroman@voyager.co.nz
> Subject: [vsnet-chat 1145] EX Hya ephemeris

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