Stars Illumination Calculator

The Stars Illumination Calculator will calculate the:

  1. Illumination (brightness) of a star S2 if the apparent magnitude and illumination of another reference star S1 as well as the illumination of the star S1 are known.

Calculation Parameters: None of values can be zero

Stars Illumination Calculator
Stars Illumination Calculator Results (detailed calculations and formula below)
Illumination of the unknown star (b2) [lux]
Illumination of the unknown star calculation
b2 = b1 ∙ 100.4 ∙ (m1 - m2 )
b2 = ∙ 100.4 ∙ ( - )
b2 = ∙ 100.4 ∙
b2 = ∙ 10
b2 =
b2 =
Stars Illumination Calculator Input Values
Apparent magnitude of the reference star (m1) []
Apparent magnitude of the unknown star (m2) []
Illumination of the reference star (b1) [lux]

Please note that the formula for each calculation along with detailed calculations are available below. As you enter the specific factors of each stars illumination calculation, the Stars Illumination Calculator will automatically calculate the results and update the Physics formula elements with each element of the stars illumination calculation. You can then email or print this stars illumination calculation as required for later use.

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Discover Physics with free Physics Revision Notes and Physics Calculator: Stars Illumination. This image shows the properties and stars illumination formula for the Stars Illumination. The Stars Illumination Calculator will calculate the Illumination (brightness) of a star S2 if the apparent magnitude and illumination of another reference star S1 as well as the illumination of the star S1 are known.

Related Physics Sections with Tutorials

Mathematics

Section 12: Optics

Section 22: Cosmology

Illumination of the unknown star Formula and Calculation

b2 = b1 ∙ 100.4 ∙ (m1 - m2 )

This formula derives from:

m1 - m2 = -2.5 log b1/b2

Cosmology Physics Tutorials associated with the Stars Illumination Calculator

The following Physics tutorials are provided within the Cosmology section of our Free Physics Tutorials. Each Cosmology tutorial includes detailed Cosmology formula and example of how to calculate and resolve specific Cosmology questions and problems. At the end of each Cosmology tutorial you will find Cosmology revision questions with a hidden answer that reveals when clicked. This allows you to learn about Cosmology and test your knowledge of Physics by answering the test questions on Cosmology.

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