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Teegarden's Star c

Teegarden's Star · M7.0 V host star · cool red dwarf · main sequence

[ TEEGARDEN_C.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of Teegarden's Star c: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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12.5 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination43.269° / 16.865°J2000 / ICRS
Gravity1.01 × Earthmodelled estimate
Year11.4 days
From its star0.0455 AUabout 6.8 million km
Stars in the system1 star3 known planets in system
Stars this world orbits1 starOrbits Teegarden's Star
Day and nightLikely synchronous spinProbably spins once per orbit, keeping one hemisphere in permanent day and the other in permanent night. Heuristic: likely at ≤0.25 AU, uncertain to 0.50 AU, probably not beyond; rotation is not directly measured.
[ TEMP.EST ]MODELLED, NOT MEASURED
Host star≈2,700 Ktypical M7.0 V · 0.13 Sun radii
No atmosphere201 K · -72°C30% reflective · heat shared
Earth-like air234 K · -39°CBaseline plus 33°C

Star temperature and orbital distance set incoming energy, but stellar size is also required. This calculation uses a typical radius for the listed spectral type, 30% reflectivity and even heat redistribution. It is not a ground-temperature forecast: air, clouds, oceans and surface reflectivity could move the result by tens to hundreds of degrees. A likely synchronous spin also means the permanent day and night sides would not share one ground temperature.

[ STARLIGHT.SPC ]VISIBLE LIGHT ONLY

The marker above the bar is a typical temperature for this star’s class. The line below is Earth’s Sun.

red-orange

Teegarden's Star is class M7.0 V. Its visible daylight would be dim and strongly red-orange; most of its energy is infrared.

Representative lit-side geometry only. On a locked world, the star’s real elevation would depend on where you stand.

[ GROUND.TXT ]STILL INFERENCE

Most plausible case. A cold red-dwarf world. The star is only 0.12 solar radii, yet from this orbit it still spans about 1.4°, nearly three times the Sun’s width, because the year is only 11 days. The planet receives about a third of Earth’s light. Expect dark rock with frost across much of the day side, and a night side that is an ice store. An open-water eyeball is the optimistic end, not the default.

Dry case. Bare rock and dust, with ice only if a little water survived. The low flux makes a hot desert less likely than on the inner Teegarden planet.

Thick-air case. A carbon-dioxide blanket could lift the ground above freezing under the clouds. Without it, this is one of the colder nearby temperate orbits.

Walking. About Earth’s weight, from a minimum mass near 1.05 Earth masses. Teegarden b, inward, would look about half as wide as the Moon when closest. From Earth the star is magnitude 15, a telescope object 12.5 light-years away.

Based on: Zechmeister et al. 2019; Teff 3034 K, R 0.12 Rsun, S 0.35, a 0.0455 AU, V 15.1

[ ORBIT.SYS ]3 KNOWN · ALL SHOWN
100% · Above 30°

Teegarden's Star c circles Teegarden's Star. Also shown: Teegarden's Star b, Teegarden's Star d, each on its NASA-catalogued orbit. Use Higher and Lower to move your viewpoint above, through and below the orbital plane, and − / + to zoom. Orbit shapes and spacing are schematic.

[ SOURCES.TXT ]

Positions, distances, and system parameters come from the NASA Exoplanet Archive composite table, queried 25 Sep 2026. GJ 273 b uses the parallax in that row, 12.4 light-years. The 45 worlds follow Bohl, Lawrence, Lowry, and Kaltenegger.