Key parameters at a glance
- A radius of 2.81 Earth radii
- A mass of 8.30 Earth masses
- Surface gravity around 1.05 g
- An orbital period of 11.940 days
- Semi-major axis 0.0960 AU
- Equilibrium temperature 625 K (352 °C)
- Distance from Earth 2,990.03 light-years
- Earth Similarity Index 0.386
- Travel time at Voyager 1 speed 52,729,209 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1234 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#732of 1978
top 37.0%
This planet
2.81R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1234 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.81 | 11.21 |
| Mass (M⊕) | 1.00 | 8.30 | 317.83 |
| Density (g/cm³) | 5.51 | 2.06 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.05 | 2.53 |
| Insolation (S⊕) | 1.00 | 40.12 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 399956098
Gaia DR2
Gaia DR2 2133394407221680256
Gaia DR3
Gaia DR3 2133394407221680256
System
Kepler-1234
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.94 Earth days (3.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0960 AU.
Transit Fingerprint
Depth
0.063 %
Duration
3.472 h
Impact parameter b
0.965
Rp / R★
0.033958
Transit midpoint (BJD)
2,454,969.5593
Photometric dip
Transit produces a flux drop of 632 ppm lasting ≈ 3.47 h.
Extended Orbital Architecture
Planet / star radius ratio
0.033958
Semi-major axis / stellar radius
8.200
Impact parameter (b)
0.965
Transit mid-time (BJD)
2,454,969.5593
Angular separation (arcsec)
0.10500
Eq. Temperature
625K
(352 °C)
Insolation (S⊕)
40.12
Earth = 1.00
Earth Similarity (ESI)
0.386
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-1234
Spectral Class
K-type orange
Effective Temperature
4,967 K — cooler than the Sun (5,778 K)
Estimated Age
4.37 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.760 R☉
Stellar Mass
0.800 M☉
Metallicity [Fe/H]
0.01
Extended Stellar Properties
Surface gravity (log g)
4.590 dex
Stellar density
3.807 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.063 mas
Total Proper Motion
15.000 mas/yr
PM Right Ascension
-2.51 mas/yr
PM Declination
14.79 mas/yr
Galactic Cartesian (pc)
x = 0.188 · y = -0.595 · z = 0.781
Equatorial (J2000)
RA 287.52204° · Dec 51.37595°
Galactic ℓ, b
82.041° · 18.125°
Ecliptic λ, β
308.603° · 72.471°
HTM-20 index
70335130
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