Stephan’s Quintet
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- wikipedia image
- Édouar Stephan who observed it visually using the 40-cm refractor of the Observatoire de Marseille in 1877.
- 位于飞马座
- 视觉上是五重奏,其实应该是4个星系构成的compact group(确定吗?)
- NGC 7320 indicates a small redshift (790 km/s) while the other four exhibit large redshifts (near 6600 km/s).
- 类似的著名compact group还有有Seyfert's Sextet(1948),VV172(chain of five galaxies)