In May 2006, the XO consortium announced its first
discovery of a transiting exoplanet, named XO-1b.
The discovery attracted a lot of attention, a/o due
to the important role played by 4 amateur
astronomers - including myself - in the months
preceding the discovery announcement. The full story
is here. Early May 2007,
the second discovery by XO was announced : XO-2b,
followed by - merely a few weeks later - XO-3b. Again, the XO Extended Team
(ET), consisting of amateur astronomers, had been monitoring
the objects intensively in the months before the
discovery was made public.
One year later, in May 2008, we announced the
discovery of XO-4b
XO-4b and XO-5b were given the codenames 112p59.0607
and 120p38.2190A resp by the XO/ET team,
in the months preceding the discovery announcement.
Below are some of my observations of these objects,
going back to early 2008.
XO 112p59.0607 = XO-4b