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lux - to - vMag

vCalc Reviewed
Ev=10−14.18−Mv2.5
(Ev)Illuminance
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Astronomy

The Illuminance to Apparent Magnitude calculator computes the apparent magnitude based on the illuminance.

INSTRUCTIONS: Choose units and enter the following:

  • (Ev) Illuminance of the Star

Apparent Magnitude (Mv): The calculator returns the magnitude as a real number.

The Math/ Science

This equation computes the apparent magnitude (Mv) from the input illuminance (Ev) input as units of lux (lx).  The formula for Apparent Magnitude from Illuminance is:

Mv = -14.18 - 2.5 * log(Ev)

where:

  • Mv = Apparent Magnitude of the celestial body
  • Ev = Illuminance in lux

Illuminance is the measure of the amount of light (luminous flux) incident on a surface.

Apparent Magnitude is a measure of a celestial body's brightness as seen by an observer on Earth.  The Apparent Magnitude is adjusted to the value it would be in the absence of atmosphere.