Arp 21 (Galaxy cluster)
R/B-band color composite image from the Second Digitized Sky Survey (DSS2), measuring 30 arcminutes across.
From South El Monte , Arp 21 is not observable – it will reach its highest point in the sky during daytime and is no higher than 10° above the horizon at dusk.
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Name
Arp 21
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Object type
Galaxy cluster
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Position
| Right ascension: | 11h04m [1] |
| Declination: | +30°01' [1] |
| Constellation: | Leo Minor |
| Magnitude: | 14.70 (V) [1] |
Source