Key parameters at a glance
- A radius of 3.33 Earth radii
- A mass of 25.00 Earth masses
- Surface gravity around 2.25 g
- An orbital period of 118.381 days
- Semi-major axis 0.4660 AU
- Equilibrium temperature 376 K (103 °C)
- Distance from Earth 2,108.10 light-years
- Earth Similarity Index 0.629
- Travel time at Voyager 1 speed 37,176,275 years
Context from the literature
Kepler-11g is an exoplanet discovered in the orbit of the sunlike star Kepler-11 by the Kepler space telescope, a NASA satellite tasked with searching for terrestrial planets. Kepler-11g is the outermost of the star's six planets. The planet orbits at a distance of nearly half the mean distance between Earth and the Sun. It completes an orbit every 118 days, placing it much further from its star than the system's inner five planets. Its estimated radius is a little over three times that of Earth, i.e. comparable to Neptune's size. Kepler-11g's distance from the inner planets made its confirmation more difficult than that of the inner planets, as scientists had to work to exhaustively disprove all reasonable alternatives before Kepler-11g could be confirmed. The planet's discovery, along with that of the other Kepler-11 planets, was announced on February 2, 2011. According to NASA, the Kepler-11 planets form the flattest and most compact system yet discovered.
Excerpted from Wikipedia · full article
5 siblings around Kepler-11
Kepler-11 g shares its host star with 5 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-11 b | Super-Earth | 1.80 | 1.90 | 10.304 | 849 | 2010 |
| Kepler-11 c | Sub-Neptune | 2.87 | 2.90 | 13.024 | 786 | 2010 |
| Kepler-11 d | Sub-Neptune | 3.12 | 7.30 | 22.685 | 653 | 2010 |
| Kepler-11 e | Neptune-like | 4.19 | 8.00 | 32.000 | 582 | 2010 |
| Kepler-11 f | Sub-Neptune | 2.49 | 2.00 | 46.689 | 513 | 2010 |
| Kepler-11 g this | Sub-Neptune | 3.33 | 25.00 | 118.381 | 376 | 2010 |
Kepler-11 g Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#261of 1978
top 13.1%
This planet
3.33R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-11 g | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.33 | 11.21 |
| Mass (M⊕) | 1.00 | 25.00 | 317.83 |
| Density (g/cm³) | 5.51 | 4.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.25 | 2.53 |
| Insolation (S⊕) | 1.00 | 5.65 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 25.000 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 8.826 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
TIC
TIC 169175503
Gaia DR2
Gaia DR2 2076960598545789824
Gaia DR3
Gaia DR3 2076960598545789824
System
Kepler-11
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 118.38 Earth days (32.4% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.4660 AU.
Transit Fingerprint
Depth
0.101 %
Duration
9.469 h
Impact parameter b
0.217
Rp / R★
0.028990
Transit midpoint (BJD)
2,455,593.8021
Photometric dip
Transit produces a flux drop of 1,006 ppm lasting ≈ 9.47 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028990
Semi-major axis / stellar radius
94.400
Impact parameter (b)
0.217
RV semi-amplitude (K)
0.014 m/s
Transit mid-time (BJD)
2,455,593.8021
Long. of periastron (ω)
97.00°
Angular separation (arcsec)
0.72100
Eq. Temperature
376K
(103 °C)
Insolation (S⊕)
5.65
Earth = 1.00
Earth Similarity (ESI)
0.629
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.
Radial velocity
Stellar wobble has been measured spectroscopically.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Lissauer et al. 2011Instrument
Kepler CCD Array
Publication
2011-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2010 at Kepler (11 shown).
Host System: Kepler-11
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,663 K — cooler than the Sun (5,778 K)
Estimated Age
8.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.065 R☉
Stellar Mass
0.961 M☉
Metallicity [Fe/H]
0.05
Extended Stellar Properties
Surface gravity (log g)
4.366 dex
Stellar density
1.122 g/cm³
Systemic radial velocity
-57.16 km/s
Rotational v·sin i
0.40 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.518 mas
Total Proper Motion
7.069 mas/yr
PM Right Ascension
-0.04 mas/yr
PM Declination
-7.07 mas/yr
Galactic Cartesian (pc)
x = 0.339 · y = -0.662 · z = 0.668
Equatorial (J2000)
RA 297.11509° · Dec 41.90911°
Galactic ℓ, b
76.161° · 8.133°
Ecliptic λ, β
314.755° · 61.202°
HTM-20 index
-842633374
Similar Worlds
Kepler-1468 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.33 R⊕ · 6,194.5 ly
Kepler-1740 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.32 R⊕ · 3,463.0 ly
K2-111 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.34 R⊕ · 653.6 ly
Kepler-940 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.34 R⊕ · 4,112.1 ly
Kepler-728 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.34 R⊕ · 5,757.4 ly
Kepler-739 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.32 R⊕ · 4,470.5 ly