Arp 129 (Galaxy cluster)
R/B-band color composite image from the Second Digitized Sky Survey (DSS2), measuring 30 arcminutes across.
From South El Monte , Arp 129 will become visible at around 20:38 (PDT), 81° above your western horizon, as dusk fades to darkness. It will then sink towards the horizon, setting at 03:44.
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Name
Arp 129
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Object type
Galaxy cluster
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Source