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NGC 7142
NGC 7142 is an open cluster about 6,200 light-years away in the constellation Cepheus. ==Observational Difficulties== NGC 7142 is located near the reflection nebula NGC 7129, which is a first indication that the cluster may be obscured by an interstellar cloud. Many studies have demonstrated this to be true dating back to the earliest investigations of this cluster. A thorough study of the Cepheus region concluded "that no part of the field may be considered unobscured." Other astronomers have noted that the reddening across the face of this cluster is likely to be uneven. The visibility of several background galaxies in the NW corner of the cluster indicate that the obscuring medium may be lowest here. Estimates of the amount of reddening range from 0.18 magnitudes, to as high as 0.41 magnitudes.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「NGC 7142」の詳細全文を読む
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