Key parameters at a glance
- A radius of 2.73 Earth radii
- A mass of 7.90 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 12.376 days
- Semi-major axis 0.0893 AU
- Equilibrium temperature 483 K (210 °C)
- Distance from Earth 1,014.92 light-years
- Earth Similarity Index 0.494
- Travel time at Voyager 1 speed 17,898,041 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-551 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#823of 1978
top 41.6%
This planet
2.73R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-551 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.73 | 11.21 |
| Mass (M⊕) | 1.00 | 7.90 | 317.83 |
| Density (g/cm³) | 5.51 | 2.13 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 14.39 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 350812580
Gaia DR2
Gaia DR2 2131523553827356544
Gaia DR3
Gaia DR3 2131523553827356544
System
Kepler-551
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 12.38 Earth days (3.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0893 AU.
Transit Fingerprint
Depth
0.177 %
Duration
2.753 h
Impact parameter b
0.638
Rp / R★
0.040251
Transit midpoint (BJD)
2,455,012.4047
Photometric dip
Transit produces a flux drop of 1,771 ppm lasting ≈ 2.75 h.
Extended Orbital Architecture
Planet / star radius ratio
0.040251
Semi-major axis / stellar radius
28.200
Impact parameter (b)
0.638
Transit mid-time (BJD)
2,455,012.4047
Angular separation (arcsec)
0.28700
Eq. Temperature
483K
(210 °C)
Insolation (S⊕)
14.39
Earth = 1.00
Earth Similarity (ESI)
0.494
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-551
Spectral Class
K-type orange
Effective Temperature
4,286 K — cooler than the Sun (5,778 K)
Estimated Age
3.80 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.630 R☉
Stellar Mass
0.650 M☉
Metallicity [Fe/H]
-0.09
Extended Stellar Properties
Surface gravity (log g)
4.660 dex
Stellar density
4.188 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.185 mas
Total Proper Motion
17.796 mas/yr
PM Right Ascension
5.48 mas/yr
PM Declination
16.93 mas/yr
Galactic Cartesian (pc)
x = 0.178 · y = -0.644 · z = 0.744
Equatorial (J2000)
RA 285.48505° · Dec 48.05438°
Galactic ℓ, b
78.281° · 18.174°
Ecliptic λ, β
301.155° · 69.824°
HTM-20 index
-62256894
Similar Worlds
K2-266 e
Sub-Neptune · K-type orange
Radius 2.73 R⊕ · 253.0 ly
Kepler-436 b
Sub-Neptune · K-type orange
Radius 2.73 R⊕ · 1,920.6 ly
Kepler-2000 b
Sub-Neptune · K-type orange
Radius 2.73 R⊕ · 1,045.6 ly
TOI-125 b
Sub-Neptune · K-type orange
Radius 2.73 R⊕ · 362.2 ly
Kepler-1058 b
Sub-Neptune · K-type orange
Radius 2.72 R⊕ · 1,604.7 ly
Kepler-80 c
Sub-Neptune · K-type orange
Radius 2.74 R⊕ · 1,205.0 ly