Key parameters at a glance
- A radius of 2.58 Earth radii
- A mass of 11.02 Earth masses
- Surface gravity around 1.66 g
- An orbital period of 7.685 days
- Semi-major axis 0.0634 AU
- Equilibrium temperature 613 K (340 °C)
- Distance from Earth 946.91 light-years
- Earth Similarity Index 0.445
- 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
KOI-1833 d 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 | 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 this | Sub-Neptune | 2.58 | 11.02 | 7.685 | 613 | 2021 |
KOI-1833 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1057of 1978
top 53.4%
This planet
2.58R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | KOI-1833 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.58 | 11.21 |
| Mass (M⊕) | 1.00 | 11.02 | 317.83 |
| Density (g/cm³) | 5.51 | 4.50 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.66 | 2.53 |
| Insolation (S⊕) | 1.00 | 27.35 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 11.020 M⊕ | Direct mass measurement (not derived). |
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 7.69 Earth days (2.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0634 AU.
Transit Fingerprint
Depth
0.114 %
Duration
1.174 h
Impact parameter b
0.307
Rp / R★
0.030993
Transit midpoint (BJD)
2,454,966.3597
Photometric dip
Transit produces a flux drop of 1,141 ppm lasting ≈ 1.17 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030993
Semi-major axis / stellar radius
17.430
Impact parameter (b)
0.307
Transit mid-time (BJD)
2,454,966.3597
Angular separation (arcsec)
0.21800
Eq. Temperature
613K
(340 °C)
Insolation (S⊕)
27.35
Earth = 1.00
Earth Similarity (ESI)
0.445
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
Jontof Hutter et al. 2021Instrument
Kepler CCD Array
Publication
2021-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Kepler (12 shown).
Host System: Kepler-968
Spectral Class
K-type orange
Effective Temperature
4,413 K — cooler than the Sun (5,778 K)
Estimated Age
2.14 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.667 R☉
Stellar Mass
0.681 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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