June 19th. Another transit of the well known HD 189733_b nearby M27 in Vulpecula.
Its an easy target for someone starting in exoplanet transits, not long duration and with a good depth. The difficult part is it's brightness, we should be very careful maintaining it the linearity window.
click here for a Finder of HD 189733
If you are interested in the data from this observation please email me @ joao . gregorio & atalaia . org
Below we have the same plot but showing measurement errors
Plotting the errors