Host star — GJ 887
- Spectral type
- M1 V
- Temperature
- 3,688 K
- Radius
- 0.47 R☉
- Mass
- 0.49 M☉
- Luminosity
- 0.037 L☉
- Distance
- 3.3 pc (10.7 ly)
Red dwarf — the most common type of star. Cool and small.
Cooler than the Sun. Orange or red dwarf.
GJ 887 d
Orbits GJ 887 · 10.7 light-years from Earth
Super-EarthRadial Velocity2026ESI 80 · Very Earth-like
Radius
2.34×
Earth
Mass
6.1×
Earth
Year
51d
Temp
241 K
-32°C
Gravity
1.1×
Earth
Distance
10.7
ly
What it would be like
GJ 887 d is a super-Earth — larger than our planet but likely still rocky or ice-rich. Whether it has a thin atmosphere like Mars or a crushing one like Venus remains unknown.
Surface gravity is about 1.1g — noticeably heavier what you're used to on Earth.
At -32°C, this world is cold — similar to Earth's polar regions or the surface of Mars. Water would likely be frozen, but subsurface liquid isn't ruled out.
An orbital period of 51 days makes the year 7.2× shorter than Earth's. You'd celebrate your birthday more often here.
Earth comparison
Logarithmic bars so Jupiter-class planets fit the same scale as Earth-size worlds.
Radius2.34R⊕
1/25×Earth = 125×
Mass6.10M⊕
1/10000×Earth = 110000×
Surface gravity1.11g
1/100×Earth = 1100×
Equilibrium temp241 K(-32°C)
0 KEarth 255 K2500 K
Side-by-side with Earth
Temperature in context
Liquid N₂Mars avgEarth eq.Earth sfc.Boiling H₂OVenus
Discovery & orbit
- Method
- Radial Velocity
- Year
- 2026
- Facility
- Multiple Observatories
- Semi-major axis
- 0.2120 AU
- Period
- 50.77 days
- Eccentricity
- —
- Density
- 2.62 g/cm³
Detected by the star's wobble — gravitational tug from the orbiting planet shifts spectral lines.
Low density — probably icy or gas-rich.
Discovered via · Radial velocity
The star's wobble — gravitational tug from the planet shifts its spectrum
A planet orbiting a star pulls it slightly back and forth. That motion compresses the star's light when moving toward us (blueshift) and stretches it away (redshift). Precision spectrographs detect the wobble at metres-per-second — enough to infer a planet's mass and orbit.
- Overall share
- ~19% of discoveries
- Best for
- Massive, close-in planets around nearby bright stars
Hertzsprung–Russell Diagram
Where this host star sits among … exoplanet host stars. The main sequence band runs diagonally — giants and supergiants sit above, white dwarfs below.
OBAFGKMCurrent star
How far is 10.7 light-years?
- A light beam leaving Earth right now would arrive in 10.7 years.
- At Voyager 1's speed (17 km/s), the trip would take approximately 189,052 years.
- A radio signal sent today would arrive in 10.7 years — and the reply wouldn't come back for twice that.
Earth Similarity Index
80/1000 — Nothing like Earth100 — Identical to Earth
ESI combines radius similarity and equilibrium temperature similarity. Earth = 100. Mars ≈ 73. Venus ≈ 44. This score reflects two physical parameters only — not atmosphere, water, or magnetic field.