Marks
Saved objects on your sky map
Your sky is waiting. Turn on Mark and choose a star to begin.
Session Log
Every night under the stars, remembered
Capture conditions (optional)
Tonight's imaging session
Your marked targets and planned events, checked against darkness, altitude, Moon separation, and your setup.
Planned events
No sessions yet.
Astrophotography Planning
What is happening up there soon, and how to catch it with your gear
Live events · SpaceCatalog
Events load independently of telescope connection.
Upcoming—
Saved to plan0
SetupNot configured
Field of view—
Mount—
Checking the cloud forecast…
Habitable Zone Calculator
Could a planet there stay warm enough for liquid water?
Loading NASA data…
Enter values to calculate
Mean insolation — x Earth
Equilibrium temperature — K
Conservative HZ — AU
Optimistic HZ — AU
0 AU 1 AU 2 AU
Orbital flux profile
Instantaneous stellar flux through one orbit
PeriastronOrbitApastron
Orbit conditions
Periastron—AU
Apastron—AU
Peak flux—x Earth
Minimum flux—x Earth
Time in conservative HZ—of orbit
Habitability is not determined by stellar flux alone. This calculator is a screening model.
AstraLog
A home for people who love space

Look up on a clear night and the sky feels like a question you have always been almost able to answer. AstraLog is a place to follow that feeling: to travel across the real sky, mark the stars and worlds that stay with you, and ask whether a planet light-years away could hold an ocean. Every answer is worked out in the open, so you can see exactly how we know what we know.

It was made by someone who wanted company under the stars. If you have ever felt small and grateful at the same moment while looking at the universe, you belong here. Soon, we will look up together.

Settings
AstraLog controls for your observing workflow
Interface
Astrophotography setup
Save your setup to use it in planning.
Planning defaults
Optical trains
One optical train is enough to start; multiple trains let AstraLog switch between real setups.
Observatory devices (ASCOM Alpaca)
No device discovery run yet.
Telescope connection (manual mount fallback)
Not connected
Observer Profile
Your observing setup
Marks0
Planned events0