The Cave Nebula (Sharpless 155)

From South El Monte , the Cave Nebula is visible in the dawn sky, becoming accessible around 21:58 (PDT), when it reaches an altitude of 21° above your north-eastern horizon. It will then reach an altitude of 60° before fading from view as dawn breaks at 04:29.
Name
The Cave Nebula (Sharpless 155)
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Object type
HII region
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All times shown in South El Monte local time.