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S 155
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. It is located in the constellation Cepheus.
Visually it is a difficult object, but with adequate exposure, makes a striking image. The nebula gets its name ''Cave Nebula'' from the dark lane at the eastern side abutting the brightest curve of emission nebulosity which gives the appearance of a deep cave when seen through a telescope visually.
==References==
Patrick Moore (1990). ''The Amateur Astronomer'' (11th ed), W.W. Norton & Company, ISBN 0-393-02864-X
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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