NGC 1647

Number of stars per data source

	Reference   64 :    8 stars
	Reference  207 :    1 star

References

 64
Svolopoulos S.N.
(1962) Astrophys. J. 136, 788
Spectral classifications in nine open clusters
1962ApJ...136..788S
 207
Hoag A.A., Applequist L.
(1965) Astrophys. J. Suppl. 12, 215
Distance moduli of open clusters
1965ApJS...12..215H