Berkeley 21
DSS image of Berkeley 21
Overlaid DSS image of Berkeley 21, 30' x 30' with north at top and west to the right

Aladin viewer for the region around Berkeley 21
C 0548+217, Lund 199, Be 21

Type  Open Cluster
Magnitude  11.1
Size  6'
Right Ascension  5h 51'  (2000)
Declination  21° 48' N
Constellation  Orion
Classification  I 2 m
Observing Notes

Andrew Cooper
Nov 27, 2023    Waikoloa, HI (map)
28cm f/10 SCT, NexStar 11" GyPSy @ 127x
Seeing: 6 Transparency: 6 Moon: 0%

A vague enhancement of the background galactic starfield, almost 5' in diameter, unresolved, on the western end of a 5' line of four 10-11th magnitude stars runing east to west, not a convincing cluster

Archinal & Hynes list this as a true cluster, survey imagery is a bit more convincing than visual
Other Data Sources for Berkeley 21
Nearby objects for Berkeley 21
Credits...

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

A complete list of credits and sources can be found on the about page

Berkeley 21