カリフォルニア星雲
1. California NebulaThe California Nebula 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 H-Beta filter (isolates the H-Beta line at 486 nm) in a rich-field telescope under dark skies.
Read “California Nebula” on English Wikipedia
Read “カリフォルニア星雲” on Japanese Wikipedia
Read “California Nebula” on DBpedia
Read “California Nebula” on English Wikipedia
Read “カリフォルニア星雲” on Japanese Wikipedia
Read “California Nebula” on DBpedia
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