Berkeley 22

Number of stars per data source

	Reference   78 : 1014 stars
	Reference   88 : 1405 stars
	Reference  420 : 1490 stars

78: Kaluzny J.; (1994) Astron. Astrophys. Suppl. 108, 151; CCD photometry of distant open clusters: I. Berkeley 22, Berkeley 29 and Berkeley 54; 1994A&AS..108..151K
88: Phelps R.L., Janes K.A., Montgomery K.A.; (1994) Astron. J. 107, 1079; Development of the galactic disk: a search for the oldest open clusters; 1994AJ....107.1079P
420: Di Fabrizio L., Bragaglia A., Tosi M., Marconi G.; (2005) Mon. Not. R. Astron. Soc. 359, 966; Berkeley 22, an old and distant open cluster toward the galactic anticentre; 2005MNRAS.359..966D