Understanding Sky Glow Impact on Astronomical Observations Light pollution and sky glow significantly affect astronomical observations by reducing th...
Formula
const bortle = inputs.bortleScale;
const zenithMag = inputs.zenithMagnitude;
const altitude = inputs.altitudeDegrees;
const extinction = inputs.extinctionCoeff;
const airmass = 1 / Math.sin(altitude * Math.PI / 180);
const skyBrightness = Math.pow(10, -0.4 * (zenithMag - (bortle - 1) * 0.5));
const atmosphericExtinction = extinction * airmass;
return {
effectiveMagnitude: zenithMag - 2.5 * Math.log10(1 + skyBrightness) - atmosphericExtinction,
skyBrightnessRatio: skyBrightness.toFixed(3)
};Bortle Dark-Sky Scale
— class
Zenith Limiting Magnitude
— mag/arcsec²
Object Altitude
— degrees
Extinction Coefficient
— mag/airmass
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Sky Glow Impact on Magnitude estimates Effective Limiting Magnitude, Sky Brightness Ratio from Bortle Dark-Sky Scale, Zenith Limiting Magnitude, Object Altitude, Extinction Coefficient. Use it to compare scenarios and understand which inputs drive the biggest changes. Results are directional estimates — verify with current, authoritative sources before making financial, legal, or health decisions.
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The estimate combines Bortle Dark-Sky Scale, Zenith Limiting Magnitude, Object Altitude and returns Effective Limiting Magnitude, Sky Brightness Ratio.
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This calculator is provided for educational and informational purposes only. It does not constitute professional legal, financial, medical, or engineering advice. Results are estimates based on the inputs provided and should not be relied upon for making significant decisions. Consult a qualified professional to verify your specific situation. CalculateThis.ai disclaims any liability for damages resulting from the use of this tool.
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