Key parameters at a glance
- A radius of 3.87 Earth radii
- A mass of 14.30 Earth masses
- Surface gravity around 0.95 g
- An orbital period of 5.827 days
- Semi-major axis 0.0640 AU
- Equilibrium temperature 1,013 K (740 °C)
- Distance from Earth 4,531.87 light-years
- Earth Similarity Index 0.206
- Travel time at Voyager 1 speed 79,919,565 years
2 siblings around Kepler-254
Kepler-254 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-254 b this | Sub-Neptune | 3.87 | 14.30 | 5.827 | 1,013 | 2014 |
| Kepler-254 c | 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 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#38of 1978
top 1.9%
This planet
3.87R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-254 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.87 | 11.21 |
| Mass (M⊕) | 1.00 | 14.30 | 317.83 |
| Density (g/cm³) | 5.51 | 1.36 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.95 | 2.53 |
| Insolation (S⊕) | 1.00 | 184.34 | 0.037 |
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 5.83 Earth days (1.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0640 AU.
Transit Fingerprint
Depth
0.154 %
Duration
3.032 h
Impact parameter b
0.740
Rp / R★
0.038060
Transit midpoint (BJD)
2,455,006.0104
Photometric dip
Transit produces a flux drop of 1,539 ppm lasting ≈ 3.03 h.
Extended Orbital Architecture
Planet / star radius ratio
0.038060
Semi-major axis / stellar radius
15.796
Impact parameter (b)
0.740
Transit mid-time (BJD)
2,455,006.0104
Angular separation (arcsec)
0.04610
Eq. Temperature
1,013K
(740 °C)
Insolation (S⊕)
184.34
Earth = 1.00
Earth Similarity (ESI)
0.206
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
HD 51608 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.87 R⊕ · 114.3 ly
Kepler-368 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.88 R⊕ · 2,514.6 ly
K2-100 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.88 R⊕ · 616.3 ly
K2-19 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.88 R⊕ · 945.3 ly
HD 20003 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.89 R⊕ · 136.4 ly
Kepler-266 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.89 R⊕ · 4,470.9 ly