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THE FEUTEX TOOLKIT

Astrophotography Pixel Sampling

Compare angular pixel scale with seeing and estimate pixels across a target.

Astronomy workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaImage scale = 206.26480624709636*p/f; Pixels across seeing disk = s*f/(206.26480624709636*p); Pixels across target = t*f/(206.26480624709636*p)
Sources and model references

Worked example

Inputs

Pixel pitch
5 µm
Effective focal length
1000 mm
Seeing
2 arcsec
Target diameter
60 arcsec

Expected results

Image scale
1.031324031 arcsec/pixel
Pixels across seeing disk
1.939254724 pixels
Pixels across target
58.17764173 pixels

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Compare angular pixel scale with seeing and estimate pixels across a target.
  2. Set pixel pitch, effective focal length, seeing, target diameter in the indicated units.
  3. Calculate and compare image scale, pixels across seeing disk, pixels across target.

Try this example

{
  "p": 5,
  "f": 1000,
  "s": 2,
  "t": 60
}

Accuracy and scope

Idealized educational model. Enter measured values in the displayed units; real systems may require additional corrections.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.