Key parameters at a glance
- A radius of 2.00 Earth radii
- A mass of 4.66 Earth masses
- Surface gravity around 1.17 g
- An orbital period of 3.693 days
- Semi-major axis 0.0389 AU
- Equilibrium temperature 745 K (472 °C)
- Distance from Earth 946.91 light-years
- Earth Similarity Index 0.369
- Travel time at Voyager 1 speed 16,698,742 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around Kepler-968
Kepler-968 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-968 b this | Sub-Neptune | 2.00 | 4.66 | 3.693 | 745 | 2016 |
| Kepler-968 c | Super-Earth | 1.69 | 3.50 | 5.709 | 644 | 2016 |
| KOI-1833 d | Sub-Neptune | 2.58 | 11.02 | 7.685 | 613 | 2021 |
Kepler-968 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1955of 1978
top 98.8%
This planet
2.00R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-968 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.00 | 11.21 |
| Mass (M⊕) | 1.00 | 4.66 | 317.83 |
| Density (g/cm³) | 5.51 | 3.20 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.17 | 2.53 |
| Insolation (S⊕) | 1.00 | 103.91 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 350814607
Gaia DR2
Gaia DR2 2132152474478407040
Gaia DR3
Gaia DR3 2132152474478407040
System
Kepler-968
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.69 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0389 AU.
Transit Fingerprint
Depth
0.079 %
Duration
1.729 h
Impact parameter b
0.207
Rp / R★
0.025522
Transit midpoint (BJD)
2,454,965.7370
Photometric dip
Transit produces a flux drop of 790 ppm lasting ≈ 1.73 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025522
Semi-major axis / stellar radius
16.400
Impact parameter (b)
0.207
Transit mid-time (BJD)
2,454,965.7370
Angular separation (arcsec)
0.13400
Eq. Temperature
745K
(472 °C)
Insolation (S⊕)
103.91
Earth = 1.00
Earth Similarity (ESI)
0.369
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
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-968
Spectral Class
K-type orange
Effective Temperature
4,598 K — cooler than the Sun (5,778 K)
Estimated Age
2.14 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.700 R☉
Stellar Mass
0.760 M☉
Metallicity [Fe/H]
0.13
Extended Stellar Properties
Surface gravity (log g)
4.630 dex
Stellar density
6.117 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.416 mas
Total Proper Motion
5.156 mas/yr
PM Right Ascension
-4.75 mas/yr
PM Declination
2.01 mas/yr
Galactic Cartesian (pc)
x = 0.172 · y = -0.618 · z = 0.767
Equatorial (J2000)
RA 285.60259° · Dec 50.11204°
Galactic ℓ, b
80.344° · 18.818°
Ecliptic λ, β
303.407° · 71.745°
HTM-20 index
286825291
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