Gliese 687
Star
Gliese 687 - a red dwarf just 14.8 light-years away in Draco, one of the very nearest stars found to host more than one planet. Two worlds circle it, both detected from the gentle wobble they raise in the star's motion.
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Key facts
Mass
7.96 × 10²⁹ kg
0.4 M☉
Radius
291,011 km
42% of the Sun's radius
Surface temperature
3,413 K (3,140 °C)
Luminosity
8.15 × 10²⁴ W
Spectral type
M3.0V (red dwarf)
Science
Physical
- Mass
- 7.96 × 10²⁹ kg · 0.4 M☉
- Radius
- 291,011 km · 42% of the Sun's radius
- Density
- 7,707 kg/m³ · 7.7× water
- Computed from mass and radius
- Spectral type
- M3.0V (red dwarf)
Motion through space
- Proper motion
- 1.31 arcseconds per year · its drift across our sky
- SIMBAD — 2020yCat.1350....0G, 2018MNRAS.475.1960F
- Radial velocity
- -28.6 km/s · approaching the Sun
- SIMBAD — 2020yCat.1350....0G, 2018MNRAS.475.1960F
- Speed across our line of sight
- 28.2 km/s
- Computed from proper motion and parallax
- Speed through space, relative to the Sun
- 40.2 km/s
- Computed from proper motion, parallax and radial velocity
Rotation
- Note
- A quiet, slowly-rotating red dwarf, well suited to the precise velocity work that found its two planets.
Composition
- By mass
- A hydrogen/helium red dwarf about 0.40 solar mass and ~2% of the Sun's light, 14.8 light-years away in Draco — one of the very nearest stars, and quiet enough for its planets to be teased out by radial velocity.
Temperature
- Surface
- 3,413 K (3,140 °C)
Radiation & temperature
- Luminosity
- 8.15 × 10²⁴ W · 0.0213 L☉
- Surface temperature
- 3,413 K (3,140 °C)
- Peak wavelength
- 849 nm · near-infrared (mostly invisible to the eye)
- Computed (Wien's law) from the surface temperature
Discovery & history
- Method
- Telescope
- Name
- A catalogue designation (Gliese 687); the star has no proper name.
A well-known nearby red dwarf; a Neptune-mass planet was found around it in 2014 from precise radial-velocity monitoring, and a second, outer planet was announced in 2020.
Images
Images from open archives · credit shown per image