Abell 21 (Planetary nebula)
R/B-band color composite image from the Second Digitized Sky Survey (DSS2), measuring 12 arcminutes across.
Finder chart
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From Cambridge , Abell 21 is visible in the dawn sky, rising at 00:20 (EDT) and reaching an altitude of 54° above the south-eastern horizon before fading from view as dawn breaks at around 05:38.
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Name
Abell 21
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Object type
Planetary nebula
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Visibility from Cambridge
All times shown in Cambridge local time.