M20 - The Trifid Nebula
From StarBase
L, R, G, B masters from StarBase.
From Palomar Online Sky Survey
R=POSS2-Red, G=0.5*R+0.5*B, B=POSS2-Blue.
L, R, G, B masters from StarBase.
R=POSS2-Red, G=0.5*R+0.5*B, B=POSS2-Blue.