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Kepler-1649 c

Kepler-1649 · M5V host star · cool red dwarf · main sequence

[ KEPLER_1649_C.IMG ]
VIEW 1 · ON THE SURFACE
1 / 2
Artist’s impression of Kepler-1649 c: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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300.7 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination292.503° / 41.830°J2000 / ICRS
Gravity1.07 × Earthmodelled estimate
Year19.5 days
From its star0.0649 AUabout 9.7 million km
Stars in the system1 star2 known planets in system
Stars this world orbits1 starOrbits Kepler-1649
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≈3,100 Ktypical M5V · 0.18 Sun radii
No atmosphere228 K · -45°C30% reflective · heat shared
Earth-like air261 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-1649 is class M5V. 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. An Earth-sized transit, 1.06 radii, around a small star 0.23 solar radii. The star spans about 1.9°. The planet receives about 75% of Earth’s light. Earth-sized and slightly under Earth’s flux: dark rock, night-side ice, a possible slush patch under a fixed red star. The mass is modelled, not weighed.

Dry case. A red desert of rock and dust, ice on the night side. Less scorched than K2-239 d, less frozen than Teegarden c.

Thick-air case. A secondary atmosphere could cloud the ground. The Earth-like radius argues against a deep hydrogen envelope.

Walking. Close to Earth’s weight, about 7% more, modelled. Kepler-1649 b would look about 0.7 of the Moon’s width, the largest neighbor among the non-TRAPPIST worlds in this list. The star is magnitude 18, 300 light-years away.

Based on: Vanderburg et al. 2020; Teff 3240 K, R 0.23 Rsun, S 0.75, Rp 1.06, a 0.065 AU

[ ORBIT.SYS ]2 KNOWN · ALL SHOWN
100% · Above 30°

Kepler-1649 c circles Kepler-1649. Also shown: Kepler-1649 b, 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.