Umbra
connecting…

Umbra

A live search through NASA's TESS space telescope data for planets and stars nobody has catalogued. When a planet crosses in front of its star, the star dims a tiny bit on a repeating schedule. Every repeating dip and every pulsing star the search finds lands here as it happens. Vetting later throws out the fakes.

The umbra is the darkest part of a shadow. We can't see these planets directly, only the tiny shadow they cast when they cross their star. That dip is what we look for.
0 / 0
stars checked
–possible planets
–eclipsing binaries
–variable stars
–already known (sanity check)

Possible planets

A dip that repeats at least twice with a steady depth. Most of these will turn out to be two stars eclipsing each other or plain noise. The real ones survive vetting. "Already known" means NASA lists it as a candidate too, which shows the search works.

Star (TIC)BrightnessStar tempOrbitDip depthDip lengthSignalStatus

Eclipsing binaries

Two stars orbiting each other and taking turns blocking the light. The dips are too deep, or alternate between deep and shallow, to be a planet.

Star (TIC)BrightnessStar tempPeriodDip depthDip lengthSignalStatus

Variable stars

Stars that brighten and fade on a regular rhythm: pulsing, spinning with starspots, or wobbling. Ones that aren't in any variable-star catalog can be reported as new discoveries.

Star (TIC)BrightnessStar tempPeriodSwingRhythm strengthStatus

How it works

1. Watch

TESS measures the brightness of thousands of stars every 2 minutes for about 27 days per patch of sky. All of it is public.

2. Search

Every star's brightness record is checked for a box-shaped dip that repeats on a schedule, and for any steady rhythm.

3. Vet

Known candidates, eclipsing binaries and catalogued variables get removed. Whatever is left and new is reported to NASA or the AAVSO.