M4 - Globular Cluster in Scorpius

Copyright 2003 John Hodge

M4 is one of the nearest globular star clusters to us at a distance of only 7200 light-years.  One interesting feature is a bar-like structure of 11th magnitude stars, visible in this photo running from the 11:30 position to the 5:30 position.  This feature was first noted by William Herschel in 1793.   


Date/Location:    April 26, 2003     Iwancio-Hodge Observatory    Bethune, SC
Instrument:    SBIG ST-7 through 12" LX-200 
Focal Ratio:   f 3.3
Guiding:    Auto via ST-7
Conditions:    Visually clear, but with moderate high level water vapor
Weather:    50 degrees F
Exposure: 1 x 5 minutes
Filters:    None