M20 / M21

Trifid Nebula and M21 Open Cluster

M20 / M21

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Object Info

Type

Diffuse Nebula

Constellation

Sagittarius

Distance

5,200 ly

Capture Details

Date

August 31, 2008

Location

Palomar Mountain, CA

Exposure

R 6x10, G 6x10, B 6x10 (bin 1x1)

Equipment

Optics

Takahashi FSQ-106N Refractor

Focal Length

530mm @f/5

Mount

Astro-Physics 900GTO

Camera

SBIG ST-2000XM

Focuser

Robo-Focus

Filters

CFW10A, Astrodon RGB

Software

CCD Commander, Maxim DL, CCDStack, Photoshop