Data on the region of sky in which the Pleides star cluster appears.

Attributes:
V apparent visual magnitude (in the "V" band. Remember, smaller is brighter)
RA right ascension in degrees (celestial longitude)
DEC declination in degrees (latitude)
parallax is in milliarcseconds
PM_RA is proper motion in the RA direction, milliarcseconds per year
PM_DEC is proper motion in the DEC direction, milliarcseconds per year
B_V is color index B–V in magnitudes (larger is redder, smaller is bluer)
V_I is color index V–I in magnitudes (larger is redder, smaller is bluer)
cluster is "Pleiades"

Which stars are actually members of the cluster (as opposed to stars that happen to be in the same line of sight)? How can you use data to tell?

Using the stars in the cluster, make a color-magnitude diagram. Find the main sequence.

Go to the Web and find a picture of the Pleiades, especially a color picture. See if your colors correspond with the ones in the picture. Remember that right ascension will be backwards :)

Source:
Data from the Hipparcos satellite web site http://astro.estec.esa.nl/Hipparcos/hipparcos.html
actually includes photometric data from Tycho as well
(downloaded by Tim Erickson, July 2003)