Key parameters at a glance
- A radius of 2.55 Earth radii
- A mass of 5.00 Earth masses
- Surface gravity around 0.77 g
- An orbital period of 10.340 days
- Semi-major axis 0.0848 AU
- Equilibrium temperature 777 K (504 °C)
- Distance from Earth 2,715.35 light-years
- Earth Similarity Index 0.308
- Travel time at Voyager 1 speed 47,885,249 years
1 sibling around Kepler-29
Kepler-29 b 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-29 b this | Sub-Neptune | 2.55 | 5.00 | 10.340 | 777 | 2011 |
| Kepler-29 c | Sub-Neptune | 2.34 | 4.50 | 13.286 | 715 | 2011 |
Kepler-29 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1105of 1978
top 55.8%
This planet
2.55R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-29 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.55 | 11.21 |
| Mass (M⊕) | 1.00 | 5.00 | 317.83 |
| Density (g/cm³) | 5.51 | 1.65 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.77 | 2.53 |
| Insolation (S⊕) | 1.00 | 55.90 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 5.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 273875635
Gaia DR2
Gaia DR2 2086435189017387264
Gaia DR3
Gaia DR3 2086435189017387264
System
Kepler-29
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.34 Earth days (2.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0848 AU.
Transit Fingerprint
Depth
0.102 %
Duration
3.041 h
Impact parameter b
0.379
Rp / R★
0.031940
Transit midpoint (BJD)
2,455,003.3855
Photometric dip
Transit produces a flux drop of 1,020 ppm lasting ≈ 3.04 h.
Extended Orbital Architecture
Planet / star radius ratio
0.031940
Semi-major axis / stellar radius
24.950
Impact parameter (b)
0.379
Transit mid-time (BJD)
2,455,003.3855
Angular separation (arcsec)
0.10200
Eq. Temperature
777K
(504 °C)
Insolation (S⊕)
55.90
Earth = 1.00
Earth Similarity (ESI)
0.308
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
Fabrycky et al. 2012Instrument
Kepler CCD Array
Publication
2012-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2011 at Kepler (12 shown).
Host System: Kepler-29
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,378 K — cooler than the Sun (5,778 K)
Estimated Age
0.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.732 R☉
Stellar Mass
0.761 M☉
Metallicity [Fe/H]
-0.44
Extended Stellar Properties
Surface gravity (log g)
4.600 dex
Stellar density
1.930 g/cm³
Rotational v·sin i
4.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.174 mas
Total Proper Motion
17.415 mas/yr
PM Right Ascension
6.33 mas/yr
PM Declination
16.23 mas/yr
Galactic Cartesian (pc)
x = 0.321 · y = -0.595 · z = 0.737
Equatorial (J2000)
RA 298.34838° · Dec 47.49130°
Galactic ℓ, b
81.523° · 10.110°
Ecliptic λ, β
321.809° · 65.908°
HTM-20 index
159650739
Similar Worlds
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K2-80 d
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Radius 2.55 R⊕ · 654.9 ly