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Celestial Query & Calculation
Star Magnitude Calculator
Convert between apparent magnitude, absolute magnitude and luminosity.
Try the tool
Absolute magnitude (M): 2.50
Luminosity (relative to Sun): 8.55 L☉
Formula: M = m − 5·(log₁₀(d) − 1)
Tool principle
Uses the distance-modulus equation M = m − 5·(log₁₀(d) − 1), where d is distance in parsecs. Luminosity relative to the Sun uses L/L☉ = 10^((4.83 − M) / 2.5).
Data source: Native astronomical formula.
User guide
- 1Enter the star's apparent magnitude m.
- 2Enter the distance to the star in parsecs.
- 3Read absolute magnitude M and estimated luminosity in solar units.
Frequently asked questions
Where do I find magnitude and distance?＋
Public catalogues such as SIMBAD or Wikipedia infoboxes.
What is a parsec?＋
About 3.26 light-years — the distance at which 1 AU subtends 1 arcsecond.