Key parameters at a glance
- A radius of 12.30 Earth radii
- A mass of 4,288.14 Earth masses
- Surface gravity around 28.34 g
- An orbital period of 13,921.423 days
- Semi-major axis 9.7260 AU
- Distance from Earth 52.27 light-years
- Earth Similarity Index 0.342
- Travel time at Voyager 1 speed 921,846 years
3 siblings around GJ 676 A
GJ 676 A c shares its host star with 3 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| GJ 676 A d | Super-Earth | 1.78 | 3.81 | 3.601 | — | 2012 |
| GJ 676 A e | Sub-Neptune | 2.47 | 6.67 | 35.474 | — | 2012 |
| GJ 676 A b | Gas Giant | 12.80 | 1,840.86 | 1,051.445 | — | 2010 |
| GJ 676 A c this | Gas Giant | 12.30 | 4,288.14 | 13,921.423 | — | 2016 |
GJ 676 A c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1349of 1771
top 76.1%
This planet
12.30R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | GJ 676 A c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.30 | 11.21 |
| Mass (M⊕) | 1.00 | 4,288.14 | 317.83 |
| Density (g/cm³) | 5.51 | 12.70 | 1.33 |
| Surface Gravity (g) | 1.00 | 28.34 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4,288.141 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 2,161.244 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 85647
TIC
TIC 369021303
Gaia DR2
Gaia DR2 5925209583053212800
Gaia DR3
Gaia DR3 5925209583053212800
System
GJ 676
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 38.11 Earth years on a mildly elliptical path at a mean orbital distance of 9.7260 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.342
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Sahlmann et al. 2016Instrument
FORS2
Publication
2016-11
Observation locale
Ground
Host System: GJ 676 A
Spectral Class
M-type red dwarf
Effective Temperature
3,734 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.690 R☉
Stellar Mass
0.626 M☉
Metallicity [Fe/H]
0.23
Extended Stellar Properties
Surface gravity (log g)
4.620 dex
Stellar density
3.232 g/cm³
Systemic radial velocity
-39.04 km/s
Rotational v·sin i
1.60 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
62.365 mas
Total Proper Motion
317.084 mas/yr
PM Right Ascension
-257.87 mas/yr
PM Declination
-184.51 mas/yr
Galactic Cartesian (pc)
x = -0.081 · y = -0.615 · z = -0.784
Equatorial (J2000)
RA 262.54489° · Dec -51.63778°
Galactic ℓ, b
339.103° · -9.542°
Ecliptic λ, β
264.747° · -28.334°
HTM-20 index
-720701838
Observation Record
Photometric series
1
RV measurements
1
Archive notes
4
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