Examples
Examples
Try the starting example
- Pixel pitch (micrometres)
- 4
- Focal length (mm)
- 24
- Target declination (degrees)
- 0
- Allowed trail length (pixels)
- 2
- Geometric exposure limit (seconds)
- 4.571147
Try another scenario
- Pixel pitch (micrometres)
- 4.4
- Focal length (mm)
- 24
- Target declination (degrees)
- 0
- Allowed trail length (pixels)
- 2
- Geometric exposure limit (seconds)
- 5.028262
Calculation method
Calculation method
Geometric exposure limit (seconds)
Limit from sidereal angular drift: allowed pixels × pixel angle / (sidereal rate × cos declination).
Symbols and units
- a
- Pixel pitch (micrometres)
- b
- Focal length (mm)
- c
- Target declination (degrees)
- d
- Allowed trail length (pixels)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Geometric central-field estimate for a fixed camera; projection and optical blur are excluded. Supported limits: All required fields must be finite values of the exact declared type and within displayed bounds. Lists contain1–1000 finite numbers. JSON tables are numeric rectangular rows, at most100 rows and30 columns; individual tools have stricter shape/domain constraints. Geometric central-field estimate for a fixed camera; projection and optical blur are excluded.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.