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Cave Nebula

C9, Sh2-155

Proper NamesCave Nebula
Caldwell NumberC9
NGC/IC NumberNone
Other DesignationsSh2-155
Right Ascension22h 57m 34.73s
Declination+62° 43' 20"
Distancec.2,400 light years
c.750 parsecs
MagnitudeApparent: +7.7
Absolute: -1.9
DimensionsApparent: 50' x 30'
Actual: c. 70 x 40 light years
Optimum VisibilitySeptember (Usually visible from northern latitudes)
NotesAn area of nebulosity some seventy light years from side to side, much of this bright emission nebula is obscured by a borad dark cloud so that, as seen from Earth, it appears as a ragged arc of light reminiscent of a cave's mouth.