Messier 70. NGC 6681

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Messier 70 (M70), is a globular cluster located at about 29,500 light years, in the constellation Sagittarius. The main characteristic of this cluster is that it underwent a core collapse (like M15, M30, M62 and M79), and therefore has a notably dense core. As a cluster, M70 is not one of the “big ones”. It has about 75,000 stars (Mass about 150,000 solar masses) compared to M13 with 300,000 stars.

Additional Information


Name(s): Messier 70, M70, NGC 6681

Type: Globular Cluster

RA:  18h 43m 11s

Dec: -32º 17’ 27”

Constellation: Sagittarius

Size (arcmin): 8×8 arcmin

Magnitude: 7.9

Distance: 29,500 ly


Date: 2019-08-18 to 2019-08-22

Location:, SSO near Coonabarabran, NSW Australia

Size (arcmin): 30×33 arcmin

Telescope: 20” f/6.8 Reflector

Camera: SBIG STX16803 (4096x4096pix)

Guiding: Astrodon MonsterMOAG off-axis guider

Total exposure: 5h 40m (L: 2h 10m; RGB: 3h 30m)

Processing: CCDStack, Photoshop CC 2020

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