The Cave Nebula (Sharpless 155)

From Cambridge , the Cave Nebula is visible all night because it is circumpolar. It will be highest in the sky shortly before dawn, when it will be lost to twilight at around 05:18, 38° above your north-eastern horizon. At dusk, it will become visible at around 20:16 (EDT), 20° above your northern horizon.
Name
The Cave Nebula (Sharpless 155)
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Object type
HII region
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All times shown in Cambridge local time.