Location of Photo:
Date/Time of photo:
March 30, 2009
SBIG ST-4000XCM APM/TMB 130/780 Mach1GTO Mount
SBIG ST-4000XCM, 18x600sec, Imager Temp -20C APM/TMB 130/780, Severe Crop (~200%) Abell 39 (PK47+42.1), a member of George Abell's Catalog of Planetery Nebulae is a low surface brightness planetary nebula in the constellation Hercules. The most sperical planetary nebula, it is almost a perfect sphere - also one of the largest known spheres with a radius of about 2.5 light-years.