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S 155, also known as the Cave Nebula, Sh2-155 or Caldwell 9, is a dim and very diffuse bright nebula within a larger nebula complex containing emission, reflection, and dark nebulosity. [1]

4 relations: Astronomy Picture of the Day, Caldwell catalogue, Cepheus (constellation), Sharpless catalog.

Astronomy Picture of the Day

Astronomy Picture of the Day (APOD) is a website provided by NASA and Michigan Technological University (MTU).

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Caldwell catalogue

The Caldwell Catalogue is an astronomical catalog of 109 star clusters, nebulae, and galaxies for observation by amateur astronomers.

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Cepheus (constellation)

Cepheus is a constellation in the northern sky.

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Sharpless catalog

The Sharpless catalog is a list of 313 HII regions (emission nebulae), intended to be comprehensive north of declination -27°.

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Redirects here:

Caldwell 9, Cave Nebula, Sh2-155, Sharpless 2-155.


[1] https://en.wikipedia.org/wiki/S_155

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