Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Astronomy
Astrophotography Exposure Calculator
Calculate the recommended sub-frame exposure time for deep-sky astrophotography based on your telescope, camera, and sky conditions. Ideal for planning imaging sessions targeting galaxies, nebulae, or star clusters.
Fill in the required fields to see your result.
Astronomy
Comet Perihelion Velocity Calculator
Calculate a comet's maximum speed at perihelion — its closest point to the Sun — using the vis-viva equation. Useful for students, astronomers, and space enthusiasts studying comet dynamics and orbital mechanics.
Fill in the required fields to see your result.
Key differences
| Astrophotography Exposure Calculator | Comet Perihelion Velocity Calculator | |
|---|---|---|
| Category | Astronomy | Astronomy |
| Inputs required | 4 | 2 |
| Result | Optimal Exposure Time (seconds) | Perihelion Velocity (km/s) |
| What it does | Calculate the recommended sub-frame exposure time for deep-sky astrophotography based on your telescope, camera, and sky conditions. Ideal for planning imaging sessions targeting galaxies, nebulae, or star clusters. | Calculate a comet's maximum speed at perihelion — its closest point to the Sun — using the vis-viva equation. Useful for students, astronomers, and space enthusiasts studying comet dynamics and orbital mechanics. |