Key parameters at a glance
- A radius of 2.15 Earth radii
- A mass of 3.20 Earth masses
- Surface gravity around 0.69 g
- An orbital period of 12.412 days
- Semi-major axis 0.1050 AU
- Equilibrium temperature 787 K (514 °C)
- Distance from Earth 4,531.87 light-years
- Earth Similarity Index 0.318
- Travel time at Voyager 1 speed 79,919,565 years
2 siblings around Kepler-254
Kepler-254 c 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-254 b | Sub-Neptune | 3.87 | 14.30 | 5.827 | 1,013 | 2014 |
| Kepler-254 c this | Sub-Neptune | 2.15 | 3.20 | 12.412 | 787 | 2014 |
| Kepler-254 d | Sub-Neptune | 2.50 | 6.80 | 18.746 | 686 | 2014 |
Kepler-254 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1741of 1978
top 88.0%
This planet
2.15R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-254 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.15 | 11.21 |
| Mass (M⊕) | 1.00 | 3.20 | 317.83 |
| Density (g/cm³) | 5.51 | 1.77 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.69 | 2.53 |
| Insolation (S⊕) | 1.00 | 67.23 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 3.200 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 158665380
Gaia DR2
Gaia DR2 2130250731680096384
Gaia DR3
Gaia DR3 2130250731680096384
System
Kepler-254
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 12.41 Earth days (3.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1050 AU.
Transit Fingerprint
Depth
0.061 %
Duration
3.362 h
Impact parameter b
0.050
Rp / R★
0.023578
Transit midpoint (BJD)
2,454,975.5394
Photometric dip
Transit produces a flux drop of 611 ppm lasting ≈ 3.36 h.
Extended Orbital Architecture
Planet / star radius ratio
0.023578
Semi-major axis / stellar radius
27.590
Impact parameter (b)
0.050
Transit mid-time (BJD)
2,454,975.5394
Angular separation (arcsec)
0.07560
Eq. Temperature
787K
(514 °C)
Insolation (S⊕)
67.23
Earth = 1.00
Earth Similarity (ESI)
0.318
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Discovery Paper
Primary reference
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-254
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,957 K — hotter than the Sun (5,778 K)
Estimated Age
0.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.910 R☉
Stellar Mass
0.849 M☉
Metallicity [Fe/H]
-0.13
Extended Stellar Properties
Surface gravity (log g)
4.524 dex
Stellar density
1.250 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.691 mas
Total Proper Motion
17.527 mas/yr
PM Right Ascension
-4.79 mas/yr
PM Declination
-16.86 mas/yr
Galactic Cartesian (pc)
x = 0.217 · y = -0.662 · z = 0.717
Equatorial (J2000)
RA 288.16465° · Dec 45.81643°
Galactic ℓ, b
76.822° · 15.643°
Ecliptic λ, β
303.979° · 67.125°
HTM-20 index
1960743190
Similar Worlds
Kepler-1286 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.15 R⊕ · 4,417.7 ly
Kepler-256 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.15 R⊕ · 3,347.8 ly
Kepler-1322 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.15 R⊕ · 4,404.1 ly
Kepler-1160 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.14 R⊕ · 3,514.8 ly
HD 86226 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.16 R⊕ · 149.0 ly
Kepler-813 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.14 R⊕ · 2,739.7 ly