StarMag: Magnitude Calculator

TipTinker

Contains adsIn-app purchases

About this app

StarMag is a stellar magnitude calculator for amateur astronomers, observers and astronomy students.

• Compare two magnitudes and see how many times brighter one source is, with the brighter one named
• A visual scale keeps the inverted magnitude system clear: the smaller number is the brighter star
• Solve the distance modulus for apparent magnitude, absolute magnitude or distance, with optional interstellar extinction
• Switch between parsecs, light-years, astronomical units and parallax without changing the physical distance
• Combine two to eight sources into one total magnitude, handy for double stars
• Turn luminosity into absolute magnitude and back on the IAU 2015 bolometric scale
• Find the mean surface brightness of galaxies and clusters from magnitude and apparent size
• Correct a magnitude for atmospheric extinction with Kasten–Young airmass or sec z
• Browse bright stars and Messier objects and drop them straight into the calculator
• Start from presets ranging from the Sun to Pluto, plus estimated eye and telescope limits
• Save scenarios and share a result in one tap

Useful for observing plans, double-star checks and photometry homework.

What’s new

Performance improvements and bug fixes