Transit Ephemeris Calculator

Transit observations can be difficult to schedule. This calculator aims to make it easier by telling you which planets are visible from your location on a given date.

This calculator makes use of the database of planetary parameters at Our database is synced to theirs daily; check the bottom of this page for the most recent update. For RV planets, assumptions must be made to derive the ephemeris and therefore the uncertainties will be large. Only transits with errors less than 10 days will be displayed. We do not account for TTVs.

Start Time (UT)
Number of nights
Stop Time (UT)
Airmass Limit
JD output
-- or --
Longitude East West
Optional filters
Min V Mag
Max V Mag
Finder Size
Min Depth (%)
Max Error (min)
Min Frac 1
Min Frac 2

Copyright © Jason Eastman () All Rights Reserved. Questions, comments, or bug reports encouraged.
exoplanets.csv last updated Wed Jul 20 14:41:55 2016