Temperature
3413 K
3340 to 3825.5
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Stellar HostProfile
GJ 687
M3 V • 4.55 pc
Records
11
literature rows
Planets
2
system count
References
12
distinct source labels
HIP: HIP 86162TIC: TIC 233193964
Approximate color
from effective temperature
Canonical Summary
Adopted host values from one source row
Values come from the row with the most populated summary measurements. Missing values stay missing. Ranges and counts describe all source rows.
Stellar source: Burt et al. 2014 • System source: TICv8
Mass
0.41 Msun
0.38 to 0.45
Radius
0.42 Rsun
0.40 to 0.43
Luminosity
-1.67 log(Lsun)
-1.70 to -1.67
Distance
4.55 pc
single adopted value
Spectral Type
M3 V
Multiple classifications reported
Planets
2
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.42 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
GJ 687
0.42 R☉
System Layout
Known planets
2 planets linked to this host
GJ 687: A Nearby Red Dwarf with Two Known Planets
GJ 687 is a star 14.8 light-years from Earth with two known planets. Its spectral type is M3 V, making it a small, cool red dwarf. The star has a mass of 0.413 solar masses and a radius of 0.418 solar radii, and its temperature is 3410 K. Its mass, radius, and temperature are all smaller or cooler than the Sun's.
Both planets were found using the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion; repeated wobbles reveal the planet and its orbital period. GJ 687 b was discovered in 2014, and GJ 687 c in 2020. Each has a minimum mass, a lower bound on its true mass that differs from an ordinary mass estimate. GJ 687 b has a minimum mass of 17.2 Earth masses and an orbital period of 38.1 days, giving it the shortest year among the listed planets. GJ 687 c has a minimum mass of 16 Earth masses and an orbital period of 728 days, the longest year among the listed planets, as well as the smallest minimum mass of the pair. Both minimum masses are larger than Earth's.
GJ 687 b has the largest minimum mass of the listed planets.
Provenance
Underlying measurements and references
Evidence Summary
Rows
11
Stellar refs
11
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| — | — | — | — | — | — | 4.55 | Duncan et al. 1991 | TICv8 |
| 3340 | 0.45 | 0.43 | — | — | — | 4.55 | Stassun et al. 2017 | TICv8 |
| — | — | — | — | — | — | 4.55 | Wright et al. 2004 | TICv8 |
| — | — | — | — | — | — | 4.55 | Nidever et al. 2002 | TICv8 |
| 3413 | 0.41 | 0.42 | — | -1.67 | M3 V | 4.55 | Burt et al. 2014 | TICv8 |
| — | — | — | — | — | M3 | 4.55 | Hawley et al. 1996 | TICv8 |
| 3561.3 | 0.42 | 0.40 | — | — | — | 4.55 | Rosenthal et al. 2021 | TICv8 |
| 3825.5 | — | — | — | — | — | 4.55 | Gaia DR2 | TICv8 |
| — | 0.40 | 0.41 | — | — | — | 4.55 | TICv8 | TICv8 |
| — | 0.40 | — | — | — | — | 4.55 | Feng et al. 2020 | TICv8 |
| 3428 | 0.38 | 0.42 | — | -1.70 | M3.0V | 4.55 | Turnbull 2015 | TICv8 |