NGC 1499
加利福尼亚星云 (NGC1499)是位于英仙座的一个发射星云，距离地球约1,000光年，在1884年被巴纳德发现的。他所以会有这个名称是因为它在长时间曝光摄影下的轮廓酷似美国的加利福尼亚州。他的长度达到2.5°，但是因为表面光度非常黯淡，所以很难以裸眼进行目视观测，宜使用广视野望远镜，配合Hβ滤镜（波长为486奈米），在黑暗的夜空下摄影。
California Nebula
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California Nebula NGC 1499
The California Nebula (NGC 1499) is an emission nebula located in the constellation Perseus. It is so named because it appears to resemble the outline of the US State of California on long exposure photographs. It is almost 2.5° long on the sky and, because of its very low surface brightness, it is extremely difficult to observe visually. It can be observed with a Hβ filter (isolates the Hβ line at 486 nm) in a rich-field telescope under dark skies. It lies at a distance of about 1,000 light years from Earth. Its fluorescence is due to excitation of the Hβ line in the nebula by the nearby prodigiously energetic O7 star, xi Persei (also known as Menkib, seen at center below it in the inset at right).
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