M 71 - Wide Field
M 71 - Wide Field |
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Object data of M71 |
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| 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. About half a degree to the SSW (near the bottom border of the above image), large but faint and sparse open cluster H20 (Harvard 20) is situated, which is fairly difficult to recognize. |
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Exposure data |
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| Date: | 2010-07-18 + 20 | |
| Location: | Nussbach / Austria (400m) | |
| Telescope: | TeleVue NP101 (4" Apo f=540mm) | |
| Camera: | EOS1000D (ISO400) | |
| Mount: | WAM 650 | |
| Exposure time: | 91x2m | |
| Exposure time total: | 3h 02m | |
| Notes: | ||
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