Upgren 1

Number of stars per data source

	Reference  226 :    6 stars
	Reference  302 :    7 stars

References

 226

Castelaz M.W., Persinger T., Stein J.W., Prosser J., Powell H.D.

(1991) Astron. J. 102, 2103

Photometry of astrometric reference stars

1991AJ....102.2103C

 302

Upgren A.R., Philip A.G.D.

(1982) Publ. Astron. Soc. Pacific 94, 229

Upgren 1, an Old Cluster near the End of its Life

1982PASP...94..229U