Sh2-155
Sh2-155, informally known as the 'cave nebula', is dark cloud of gas embedded in a giant emission nebula. The top edge of the cloud is illuminated by several hot, massive (OB) stars that are part of the Cepheus OB3 assocation.
| Observatory: | Kitt Peak National Observatory Kitt Peak, Arizona |
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| Telescope: | KPNO 4-Meter |
| Instrument: | Mosaic I |
| Astronomer: | Dr. Travis Rector |
| Date of Observation: | 09-09-2009 |
| Filters and Assigned Colors: | Hydrogen alpha (red), Sulphur [SII] (blue) and I (orange) |
| Exposure Times: | 5x5min in H-alpha and [S II] each and 5x3min in I |
| Location of Image: | Cepheus |
| Field of View: | 36.4 x 35.5 arcmin |
| Orientation: | North is left, East is down |
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| Link to Full Resolution Image | |
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