Abell 2218 - A Gravitational Lens
Abell 2218 - A Gravitational Lens |
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Object data of Abell2218 |
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| Object type: | galaxy cluster | ||
| Size: | 20' | ||
| Magnitude: | 17.7 mag (magnitude for the tenth-ranked cluster member) | ||
| Constellation: | Dra | ||
| Distance: | 2.1 billion Ly | ||
| Notes: |
Abell 2218 is a cluster of galaxies about 2.1 billion light-years away in
the constellation Draco. Acting as a powerful gravitational lens, it
magnifies and distorts galaxies lying behind the cluster core into long arcs,
as predicted by the General Theory of Relativity. These arcs are very faint and difficult to capture. The three brightest arcs are visible in a 400% crop of the above image. |
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Exposure data |
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| Date: | 2010-07-02 + 07 + 08 + 09 | ||
| 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 36x12m / R 9x12m / G 9x12m / B 9x12m | ||
| Exposure time total: | 12h 36m | ||
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