Astrophotography
Star ID
Upload any night-sky photo or test frame to see which stars, constellations and deep-sky objects are in the shot. You also get exactly where it was pointing (RA and Dec, altitude and azimuth) and the field of view.
‹ All tools
Lens
mm · required
Close is fine — the solve measures the true value.
Frame

Preparing star catalog…

Camera & Location
Set this once. Unlike focal length, a wrong sensor width can’t be corrected by the solve.
east +
Filled from the file when it is there.

Star positions from the HYG database. Plate solving uses the geometric hashing method developed by Astrometry.net. Sources