Key parameters at a glance
- A radius of 2.59 Earth radii
- A mass of 7.21 Earth masses
- Surface gravity around 1.08 g
- An orbital period of 39.831 days
- Semi-major axis 0.2089 AU
- Equilibrium temperature 420 K (147 °C)
- Distance from Earth 1,380.77 light-years
- Earth Similarity Index 0.569
- Travel time at Voyager 1 speed 24,349,964 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1854 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1051of 1978
top 53.1%
This planet
2.59R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1854 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.59 | 11.21 |
| Mass (M⊕) | 1.00 | 7.21 | 317.83 |
| Density (g/cm³) | 5.51 | 2.29 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.08 | 2.53 |
| Insolation (S⊕) | 1.00 | 7.33 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 120825566
Gaia DR2
Gaia DR2 2099068444479581184
Gaia DR3
Gaia DR3 2099068444479581184
System
Kepler-1854
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 39.83 Earth days (10.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2089 AU.
Transit Fingerprint
Depth
0.039 %
Duration
2.442 h
Impact parameter b
0.999
Rp / R★
0.017664
Transit midpoint (BJD)
2,454,988.6409
Photometric dip
Transit produces a flux drop of 389 ppm lasting ≈ 2.44 h.
Extended Orbital Architecture
Planet / star radius ratio
0.017664
Semi-major axis / stellar radius
22.500
Impact parameter (b)
0.999
Transit mid-time (BJD)
2,454,988.6409
Angular separation (arcsec)
0.49400
Eq. Temperature
420K
(147 °C)
Insolation (S⊕)
7.33
Earth = 1.00
Earth Similarity (ESI)
0.569
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
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-1854
Spectral Class
K-type orange
Effective Temperature
5,026 K — cooler than the Sun (5,778 K)
Estimated Age
12.88 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.759 R☉
Stellar Mass
0.800 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.580 dex
Stellar density
22.325 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Total Proper Motion
29.229 mas/yr
PM Right Ascension
-29.03 mas/yr
PM Declination
-3.41 mas/yr
Galactic Cartesian (pc)
x = 0.223 · y = -0.763 · z = 0.607
Equatorial (J2000)
RA 286.28593° · Dec 37.38699°
Galactic ℓ, b
68.255° · 13.568°
Ecliptic λ, β
295.929° · 59.369°
HTM-20 index
918555681
Similar Worlds
TOI-836.01
Sub-Neptune · K-type orange
Radius 2.59 R⊕ · 89.7 ly
TOI-1064 b
Sub-Neptune · K-type orange
Radius 2.59 R⊕ · 222.0 ly
EPIC 212737443 b
Sub-Neptune · K-type orange
Radius 2.59 R⊕ · 1,096.7 ly
TOI-2076 b
Sub-Neptune · K-type orange
Radius 2.59 R⊕ · 136.7 ly
K2-285 b
Sub-Neptune · K-type orange
Radius 2.59 R⊕ · 505.4 ly
Kepler-1388 b
Sub-Neptune · K-type orange
Radius 2.59 R⊕ · 1,480.1 ly