大蕾丝座星云的波浪
(原标题: Waves of the Great Lacerta Nebula)
2022-09-14
浏览次数: 15
它是天空中最大的星云之一——为什么它不为人所知呢？大蕾丝座星云与仙女座星系的角大小大致相同，位于蜥蜴星座（蕾丝座）的方向。发射星云很难用宽视场双筒望远镜看到，因为它太暗了，但用大望远镜通常也很难看到，因为它的角度太大了——跨度约为3度。这个编号为Sharpless 126 （Sh2-126）的星云的深度、宽度、波浪和美丽，只有通过长时间的相机曝光才能最好地看到和欣赏。这张特色图片就是这样的组合曝光——在过去的6月和7月，在西班牙IC天文台拍摄了5种不同颜色的10个小时和6个多晚上。大蕾丝座星云中的氢气之所以发出红色的光，是因为它被明亮的恒星蕾丝座10发出的光激发了。蕾丝座10是位于红色星云中心上方的一颗明亮的蓝色恒星。恒星和星云相距约1200光年。丰收满月2022:APOD值得注意的提交
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It is one of the largest nebulas on the sky -- why isn't it better known? Roughly the same angular size as the Andromeda Galaxy, the Great Lacerta Nebula can be found toward the constellation of the Lizard (Lacerta). The emission nebula is difficult to see with wide-field binoculars because it is so faint, but also usually difficult to see with a large telescope because it is so great in angle -- spanning about three degrees. The depth, breadth, waves, and beauty of the nebula -- cataloged as Sharpless 126 (Sh2-126) -- can best be seen and appreciated with a long duration camera exposure. The featured image is one such combined exposure -- in this case 10 hours over five different colors and over six nights during this past June and July at the IC Astronomy Observatory in Spain. The hydrogen gas in the Great Lacerta Nebula glows red because it is excited by light from the bright star 10 Lacertae, one of the bright blue stars just above the red-glowing nebula's center. The stars and nebula are about 1,200 light years distant. Harvest Full Moon 2022: Notable Submissions to APOD
© Jarmo Ruuth, Telescope Live; Text: Ata Sarajedini (Florida Atlantic U., Astronomy Minute podcast)