Key parameters at a glance
- A radius of 1.43 Earth radii
- A mass of 2.64 Earth masses
- Surface gravity around 1.29 g
- An orbital period of 8.929 days
- Semi-major axis 0.0476 AU
- Equilibrium temperature 300 K (27 °C)
- Distance from Earth 41.14 light-years
- Earth Similarity Index 0.905
- Travel time at Voyager 1 speed 725,470 years
- Almost certainly tidally locked to its host star given the close orbit
Context from the literature
GJ 1132 is a small red dwarf star 41.1 light-years away from Earth in the constellation Vela. In 2015, it was revealed to have a hot rocky Earth-sized planet orbiting it every 1.6 days. In 2018, a second planet and a potential third were revealed.
Excerpted from Wikipedia · full article
1 sibling around GJ 1132
GJ 1132 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| GJ 1132 b | Rocky Terrestrial | 1.19 | 1.84 | 1.629 | 584 | 2015 |
| GJ 1132 c this | Super-Earth | 1.43 | 2.64 | 8.929 | 300 | 2018 |
GJ 1132 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#864of 1176
top 73.4%
This planet
1.43R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | GJ 1132 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.43 | 11.21 |
| Mass (M⊕) | 1.00 | 2.64 | 317.83 |
| Density (g/cm³) | 5.51 | 4.96 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.29 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 2.640 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
TIC
TIC 101955023
Gaia DR2
Gaia DR2 5413438219396893568
Gaia DR3
Gaia DR3 5413438219396893568
System
GJ 1132
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.93 Earth days (2.4% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0476 AU.
Eq. Temperature
300K
(27 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.905
0 = alien, 1 = Earth-identical
Insufficient insolation data — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Feng et al. 2017Instrument
HARPS Spectrograph
Publication
2017-10
Observation locale
Ground
Discovery cohort
Planets confirmed in 2018 at La Silla Observatory (5 shown).
Host System: GJ 1132
Spectral Class
M-type red dwarf
Effective Temperature
3,270 K — cooler than the Sun (5,778 K)
Estimated Age
5.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.211 R☉
Stellar Mass
0.181 M☉
Metallicity [Fe/H]
-0.31
Extended Stellar Properties
Surface gravity (log g)
5.037 dex
Stellar density
25.300 g/cm³
Systemic radial velocity
35.08 km/s
Rotational v·sin i
2.00 km/s
Rotation period
122.30 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
79.254 mas
Total Proper Motion
1,132.483 mas/yr
PM Right Ascension
-1,053.98 mas/yr
PM Declination
414.30 mas/yr
Galactic Cartesian (pc)
x = -0.610 · y = 0.301 · z = -0.733
Equatorial (J2000)
RA 153.70907° · Dec -47.15494°
Galactic ℓ, b
277.255° · 7.759°
Ecliptic λ, β
181.434° · -52.420°
HTM-20 index
-2025276557
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