Pismis 18

Number of stars per data source

	Reference  191 :  342 stars
	Reference  515 :  822 stars

References

 191
Skiff B.
(1998) Priv. Comm.
Coordinates from the GSC and USNO-A1.0 catalogues in the field of open clusters
 515
Tadross A.L.
(2008) New Astronomy 13, 370
The main parameters of 25 un-studied open star clusters
2008NewA...13..370T