Exploring the Universe from Southwest Virginia. established 1996
© ERAS 2013
ECHO RIDGE ASTRONOMICAL SOCIETY
Sky Quality Meter located on Gem Stream Road, Elk Creek, Va.
NELM = Naked Eye Limiting Magnitude
Most recent reading
Model : Unihedron SQM-LE/LU with Uniherdron weatherproof housing.
Software: Knightware SQM Reader Pro 3.
The SQM meter is currently set to run only at night and is pointed towards the zenith. It takes
a reading every 5 minutes and after the third reading it averages the 3 and records it. It is used
for astronomical purposes and will be used to quantify the ever growing problem of light
pollution on Grayson County.
REFRESH YOUR SCREEN FOR THE LATEST READING.
NELM or naked eye limiting magnitude reading is the theoretical lowest magnitude star visible
to the naked eye at the zenith with clear skies and that amount of darkness.