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Arc Seconds Per Pixel Calculator

Formula

To calculate the Arc Seconds Per Pixel:

$ASPP = \left(\frac{PS}{FL}\right) \times 206.265$

Where:

$ASPP$ is the Arc Seconds Per Pixel (arc-sec/pixel)
$PS$ is the pixel size (µm)
$FL$ is the focal length (mm)

Arc Seconds Per Pixel Definition

Arc Seconds Per Pixel is a measure of the angular resolution of a digital imaging system. It indicates how many arc seconds of the sky are covered by each pixel in the image.

Example Calculation 1

Let's assume the following values:

Pixel Size ( $PS$ ) = 5 µm
Focal Length ( $FL$ ) = 1000 mm

Using the formula:

$ASPP = \left(\frac{5}{1000}\right) \times 206.265 = 1.03$

The Arc Seconds Per Pixel is 1.03 arc-sec/pixel.

Example Calculation 2

Let's assume the following values:

Pixel Size ( $PS$ ) = 4 µm
Focal Length ( $FL$ ) = 800 mm

Using the formula:

$ASPP = \left(\frac{4}{800}\right) \times 206.265 = 1.03$

The Arc Seconds Per Pixel is 1.03 arc-sec/pixel.