M11: open cluster distance measurement [Observed: 23 June 2006]
The M11 open cluster (Wild Duck cluster, NGC6705) is observed through
B and V filters. An HR diagram is constructed. It is compared
with an absolute HR diagram made from Hipparcos data which measured the
parallaxes of nearby stars. The distance to M11 is then derived. The interstellar
extinction is taken into account using the Henden's sequence for M11 (U data).