Key parameters at a glance
- A radius of 2.73 Earth radii
- A mass of 7.90 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 76.537 days
- Semi-major axis 0.3537 AU
- Equilibrium temperature 503 K (230 °C)
- Distance from Earth 3,861.30 light-years
- Earth Similarity Index 0.477
- Travel time at Voyager 1 speed 68,093,945 years
1 sibling around Kepler-1129
Kepler-1129 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 |
|---|---|---|---|---|---|---|
| Kepler-1129 b | Sub-Neptune | 2.96 | 9.06 | 24.340 | 737 | 2016 |
| Kepler-1129 c this | Sub-Neptune | 2.73 | 7.90 | 76.537 | 503 | 2016 |
Kepler-1129 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#823of 1978
top 41.6%
This planet
2.73R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1129 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.73 | 11.21 |
| Mass (M⊕) | 1.00 | 7.90 | 317.83 |
| Density (g/cm³) | 5.51 | 2.13 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 7.01 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 137212833
Gaia DR2
Gaia DR2 2101651781408908160
Gaia DR3
Gaia DR3 2101651781408908160
System
Kepler-1129
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 76.54 Earth days (21.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3537 AU.
Transit Fingerprint
Depth
0.065 %
Duration
5.693 h
Impact parameter b
0.064
Rp / R★
0.024564
Transit midpoint (BJD)
2,454,997.1549
Photometric dip
Transit produces a flux drop of 652 ppm lasting ≈ 5.69 h.
Extended Orbital Architecture
Planet / star radius ratio
0.024564
Semi-major axis / stellar radius
105.000
Impact parameter (b)
0.064
Transit mid-time (BJD)
2,454,997.1549
Angular separation (arcsec)
0.29900
Eq. Temperature
503K
(230 °C)
Insolation (S⊕)
7.01
Earth = 1.00
Earth Similarity (ESI)
0.477
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-1129
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,831 K — hotter than the Sun (5,778 K)
Estimated Age
4.07 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.000 R☉
Stellar Mass
1.000 M☉
Metallicity [Fe/H]
-0.04
Extended Stellar Properties
Surface gravity (log g)
4.440 dex
Stellar density
1.190 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.817 mas
Total Proper Motion
6.686 mas/yr
PM Right Ascension
1.73 mas/yr
PM Declination
-6.46 mas/yr
Galactic Cartesian (pc)
x = 0.277 · y = -0.698 · z = 0.660
Equatorial (J2000)
RA 291.60450° · Dec 41.30933°
Galactic ℓ, b
73.676° · 11.500°
Ecliptic λ, β
306.176° · 62.062°
HTM-20 index
-514565195
Similar Worlds
Kepler-221 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.73 R⊕ · 1,256.5 ly
Kepler-836 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.73 R⊕ · 3,196.4 ly
Kepler-838 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.73 R⊕ · 3,600.9 ly
Kepler-164 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.73 R⊕ · 2,905.3 ly
Kepler-1567 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.73 R⊕ · 3,933.8 ly
K2-380 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.73 R⊕ · 813.1 ly