M 71

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DSLR widefield image

Object data of M71

Object type: globular star cluster
Size: 7'
Magnitude: 8.2 mag
Constellation: Sge
Distance: 13,000 Ly
Notes: M71 is a loose but beautiful globular cluster in the small constellation Sagitta. For a long time, the classification of M71 as a globular cluster was uncertain, many astronomers thought it was a rather condensed open cluster.

The golden-yellow color of M71 is a consequence of the reddening of the star light by dust: E(B-V) = 0.31 mag.

Exposure data

Date: 2010-07-18 + 20
Location: Nussbach / Austria (400m)
Telescope: 12" Newtonian telescope (f=1120mm)
Camera: ST2000XM with CFW8 and Baader Filters
Binning: L 1x1 / RGB 1x1
Exposure time: L 44x2m / R 9x5m / G 9x5m / B 9x5m
Exposure time total: 3h 43m