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# Resolving Power of a Telescope

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Equation / Last modified by KurtHeckman on 2019/08/15 23:58
`\alpha = `

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ID

sspickle.Resolving Power of a Telescope

UUID

3b8c8709-3d8a-11e7-9770-bc764e2038f2

The **Resolving Power of a Telescope** calculator computes the angular distance between two stars on the limit of visibility for a telescope.

**INSTRUCTIONS:** Choose your preferred units and enter the following:

- (
**λ**) This is the wavelength of light - (
**D**) This the the diameter of the telescope.

**Resolving Power:** The calculator returns the Resolving Power (**α**) in arc seconds.

### General Information

The resolving power of a telescope is the angular distance between two stars that are just barely visible through the telescope as separate images. The resolving power α in arc seconds of a telescope with diameter D in meters that is collecting light of wavelength λ in nanometers equals is given by this formula.

#### Astronomy Calculators

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^{rd}Law formula T² = (4π • R³)/(G • M) - Small Angle Formula
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This equation,

**Resolving Power of a Telescope**, is used in 2 calculators.**Calculators**