Key parameters at a glance
- A radius of 3.15 Earth radii
- A mass of 10.10 Earth masses
- Surface gravity around 1.02 g
- An orbital period of 211.034 days
- Semi-major axis 0.6235 AU
- Equilibrium temperature 215 K (-58 °C)
- Distance from Earth 894.25 light-years
- Earth Similarity Index 0.564
- Travel time at Voyager 1 speed 15,770,178 years
Kepler-1868 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#396of 1978
top 20.0%
This planet
3.15R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1868 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.15 | 11.21 |
| Mass (M⊕) | 1.00 | 10.10 | 317.83 |
| Density (g/cm³) | 5.51 | 1.78 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.02 | 2.53 |
| Insolation (S⊕) | 1.00 | 0.50 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 275571117
Gaia DR2
Gaia DR2 2078226308223597696
Gaia DR3
Gaia DR3 2078226308223597696
System
Kepler-1868
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 211.03 Earth days (57.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.6235 AU.
Transit Fingerprint
Depth
0.195 %
Duration
7.119 h
Impact parameter b
0.895
Rp / R★
0.051230
Transit midpoint (BJD)
2,455,112.1289
Photometric dip
Transit produces a flux drop of 1,953 ppm lasting ≈ 7.12 h.
Extended Orbital Architecture
Planet / star radius ratio
0.051230
Semi-major axis / stellar radius
104.700
Impact parameter (b)
0.895
Transit mid-time (BJD)
2,455,112.1289
Angular separation (arcsec)
2.27000
Eq. Temperature
215K
(-58 °C)
Insolation (S⊕)
0.50
Earth = 1.00
Earth Similarity (ESI)
0.564
0 = alien, 1 = Earth-identical
Within the conservative habitable zone — surface water would be frozen.
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
Valizadegan et al. 2022Instrument
Kepler CCD Array
Publication
2022-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Kepler (12 shown).
Host System: Kepler-1868
Spectral Class
K-type orange
Effective Temperature
4,658 K — cooler than the Sun (5,778 K)
Estimated Age
14.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.686 R☉
Stellar Mass
0.743 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.632 dex
Stellar density
1.446 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.618 mas
Total Proper Motion
12.093 mas/yr
PM Right Ascension
4.94 mas/yr
PM Declination
-11.04 mas/yr
Galactic Cartesian (pc)
x = 0.287 · y = -0.666 · z = 0.689
Equatorial (J2000)
RA 293.29837° · Dec 43.55580°
Galactic ℓ, b
76.296° · 11.381°
Ecliptic λ, β
310.413° · 63.762°
HTM-20 index
-613427244
Similar Worlds
Kepler-324 c
Sub-Neptune · K-type orange
Radius 3.15 R⊕ · 1,635.9 ly
Kepler-1536 b
Sub-Neptune · K-type orange
Radius 3.14 R⊕ · 1,263.0 ly
Kepler-57 b
Sub-Neptune · K-type orange
Radius 3.14 R⊕ · 2,100.9 ly
HD 13808 c
Sub-Neptune · K-type orange
Radius 3.13 R⊕ · 92.1 ly
HD 69830 b
Sub-Neptune · K-type orange
Radius 3.17 R⊕ · 41.0 ly
Kepler-1593 b
Sub-Neptune · K-type orange
Radius 3.17 R⊕ · 2,081.7 ly