CCD image of globular star
cluster NGC 4147 taken with an ST-6 CCD camera thru a 20-inch F/8.1 telescope.
The field of view is about 5x7 arc minutes. Exposure = 6 minutes.
Description of NGC 4147 in The Deep Sky Field Guide to Uranometria 2000:
Magnitude of the brightest stars
= 14.5
Horizontal branch stars magnitude = 16.9
Concentration: 6 ( scale 1{dense} to 12{loose} )
Click here
for the latest
news on Globular Star Cluster Ages!!