re HD 155229

[jg <jg@jgws.freeisp.co.uk>]

I've been kindly provided with a more rigorous spectral type for this
star of F5 III.

Also I note that _all_ the observations for it (both in V and I) are
flagged as saturated, and as the range on any one of the two observation
nights is barely 0.1 magnitude I'd start being dubious.  Granted the
mean mag on the two nights is different enough to make one feel that
different parts of a varying light curve are being sampled.  Trouble is,
I'm getting different signals on this.  Michael R.'s post stating
calibration by Tycho for photometry suggests to me internight mean mags
should be comparable, after all it's calibration by the same stars
which'll suffer whatever the target star is suffering re environment
and/or instrumental effects. Tom's post implies internight mean
magnitudes aren't necessarily comparable.  I suppose both cases are
true, so Michael R.'s statement just needs an error range adding to it
(?????)  The low full amplitude for HD 155229 suggests it'll fall below
the limit of that error range.



Cheers

John G.