NGC 6656 (M 22)

Distance from Sun: 3300 ± 40 pc
Galactocentric distance: 5000 ± 30 pc
V-band magnitude: 5.06 ± 0.04
Mass: 4.70 · 105 M
M/L ratio: 2.0 ± 0.1 M/L
Half-mass radius: 5.21 pc
Power-law MF slope: α = -0.90 ± 0.15


Image Credit: Bernhard Hubl, http://www.astrophoton.com/


Observations

Cluster distance Proper motion Radial velocity
Orbit over the last 500 Myr
Velocity dispersion profile Rotation Color magnitude diagram
HST photometry Mass function MF slope

N-body Fits

Surface density Proper motions Radial velocities
Remnant fraction Mass-to-light ratio