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Kepler-296 e

Kepler-296 · M2 V host star · cool red dwarf · main sequence

[ KEPLER_296_E.IMG ]
VIEW 1 · ON THE SURFACE
Artist’s impression of Kepler-296 e: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
544.7 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination286.540° / 49.437°J2000 / ICRS
Gravity1.26 × Earthmodelled estimate
Year34.1 days
From its star0.1690 AUabout 25.3 million km. Kepler-296 B ≈35 AU projected from Kepler-296
Stars in the system2 stars5 known planets in system
Stars this world orbits1 starOrbits Kepler-296; not circumbinary
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≈3,550 Ktypical M2 V · 0.44 Sun radii
No atmosphere253 K · -21°C30% reflective · heat shared
Earth-like air286 K · 12°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

Kepler-296 is class M2 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. The planet orbits the brighter star of a binary. That star is 0.48 solar radii and about 3740 K, so the daylight is orange-red, not a deep M-dwarf ember. From 0.17 AU the star spans about 1.5°, and the planet receives about 1.4 times Earth’s light. Radius 1.53 Earth radii. Warm rock, ice only on the night side if the spin is locked. The companion star Kepler-296 B, about 35 AU away in projection, is a bright point.

Dry case. Warm dunes and oxidized rock. The flux supports a hot day side. Do not add a strong periastron bake: the often-quoted eccentricity is an upper limit.

Thick-air case. A 1.5-radius world can wear a cloudy volatile layer. The ground may be hidden.

Walking. About 26% heavier than Earth, modelled. Kepler-296 d is about 0.4 of the Moon’s width, and f about 0.2. The second star is a point, not a disk. The system is about 545 light-years away, magnitude 16.

Based on: Barclay et al. 2015; planets orbit the primary of a binary separated by about 35 AU projected; Teff 3740 K, R 0.48 Rsun, S 1.41, Rp 1.53, a 0.169 AU. The archive eccentricity 0.33 is a published upper limit, not a measured ellipse.

[ ORBIT.SYS ]5 KNOWN · ALL SHOWN
100% · Above 30°

Kepler-296 e circles Kepler-296 alone. Kepler-296 A and B are separated by about 35 AU in projection; their true three-dimensional separation is larger. Also shown: Kepler-296 b, Kepler-296 c, Kepler-296 d, Kepler-296 f, 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.