Exoplanet XO-1b in CrB

Dear group ... and oriel,

Good weather and very good seeing are finally here and represent an
opportunity to brush off a serious amount of rust accumulated during
winter and spring due to inactivity thanks to clouds, clouds and more
clouds.

I was somewhat apprehensive in pursuing XO-1b due to the rich presence
of the twelve-day old moon. As was the case with other occasions
involving rich lunar light, I used my Baader IR-Pass filter for the
pursuit of this 180-min transit and the resulting light curve exceeded
my expectations.

The exoplanet XO-1b is very similar to Jupiter with respect to its
mass and radius. Similarly, the host star is also very similar to our
sun with respect to its spectral type, mass and radius.

For the result based on five hours total time and which includes 60
minutes pre-ingress, 180 minutes for the transit itself as well as 65
minutes post-ingress, I kindly direct you to
http://www.perseus.gr/Astro-Photomet...1-20090604.htm and where the
17 mmag drop in the magnitude of the parent star (11.19 pre-ingress)
is beautifully documented.

I would like to thank my two faithful assistants - my AP160 and AP1200
- whose efforts make all of this possible!

Anthony.