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Sky Conditions

Transparency

You can choose to include observations with atmospheric transparency values within an inclusive range using any of three transparency scales. You can enter the range of values in Lowest and Highest. Choose Ignore to include observations regardless of transparency values.

▪Personal Rating - a simple rating according to your own scale (0-10).

▪Air Quality (PM2.5) - measurement of particulate matter of 2.5 microns in size or smaller in ug/m3 in a scale of 0 to 500.

▪Aerosol Optical Depth - a direct measurement of atmospheric turbidity taken by satellites in the scale of 0 to 1.0.

Seeing

You can choose to include observations with atmospheric seeing values within an inclusive range using any of four seeing scales. You can enter the range of values in Lowest and Highest. Choose Ignore to include observations regardless of seeing values.

▪Personal Rating - a simple rating according to your own scale (0-10).

▪Antoniadi - an estimate made by the observer using a 5 point scale where 1 = best and 5 = worst.

▪Pickering - an estimate made by the observer using a 10 point scale where 1 = worst and 10 = best.

▪Arcseconds - a direct visual estimate made by the observer by splitting close double stars, or the full-width at half-maximum (FWHM) value calculated by some imaging software.

Darkness

You can choose to include observations with sky darkness values within an inclusive range using any of four darkness scales. You can enter the range of values in Lowest and Highest. Choose Ignore to include observations regardless of darkness values.

▪Personal Rating - a simple rating according to your own scale (0-10).

▪Bortle - an estimate made by the observer using a 9 point scale where 1 = best and 9 = worst

▪Limiting Mag (NELM) - a direct visual estimate made by the observer of the faintest magnitude star visible at the zenith

▪Mag / Square Arcsec - a direct measurement made by the observer using a device such as Unihedron's Sky Quality Meter

Sky Quality Meter is a product of Unihedron.