Key parameters at a glance
- A radius of 6.11 Earth radii
- A mass of 120.00 Earth masses
- Surface gravity around 3.21 g
- An orbital period of 9.434 days
- Semi-major axis 0.0800 AU
- Equilibrium temperature 791 K (518 °C)
- Distance from Earth 632.85 light-years
- Earth Similarity Index 0.266
- Travel time at Voyager 1 speed 11,160,314 years
Kepler-63 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#274of 574
top 47.6%
This planet
6.11R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-63 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 6.11 | 11.21 |
| Mass (M⊕) | 1.00 | 120.00 | 317.83 |
| Density (g/cm³) | 5.51 | 3.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 3.21 | 2.53 |
| Insolation (S⊕) | 1.00 | 100.37 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 120.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 299158887
Gaia DR2
Gaia DR2 2132628489996257920
Gaia DR3
Gaia DR3 2132628489996257920
System
Kepler-63
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.43 Earth days (2.6% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0800 AU.
Transit Fingerprint
Depth
0.402 %
Duration
2.903 h
Impact parameter b
0.732
Rp / R★
0.062200
Transit midpoint (BJD)
2,455,010.8431
Photometric dip
Transit produces a flux drop of 4,024 ppm lasting ≈ 2.90 h.
Extended Orbital Architecture
Planet / star radius ratio
0.062200
Semi-major axis / stellar radius
19.120
Impact parameter (b)
0.732
RV semi-amplitude (K)
40.000 m/s
Transit mid-time (BJD)
2,455,010.8431
Long. of periastron (ω)
90.00°
Sky-projected obliquity (λ)
-110.00°
True obliquity (ψ)
145.00°
Angular separation (arcsec)
0.41200
Eq. Temperature
791K
(518 °C)
Insolation (S⊕)
100.37
Earth = 1.00
Earth Similarity (ESI)
0.266
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Sanchis Ojeda et al. 2013Instrument
Kepler CCD Array
Publication
2013-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2013 at Kepler (12 shown).
Host System: Kepler-63
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,576 K — cooler than the Sun (5,778 K)
Estimated Age
0.21 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.901 R☉
Stellar Mass
0.984 M☉
Metallicity [Fe/H]
0.05
Extended Stellar Properties
Surface gravity (log g)
4.520 dex
Stellar density
1.895 g/cm³
Systemic radial velocity
-21.72 km/s
Rotational v·sin i
5.60 km/s
Rotation period
5.40 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
5.125 mas
Total Proper Motion
27.412 mas/yr
PM Right Ascension
14.34 mas/yr
PM Declination
23.36 mas/yr
Galactic Cartesian (pc)
x = 0.214 · y = -0.613 · z = 0.761
Equatorial (J2000)
RA 289.22629° · Dec 49.54828°
Galactic ℓ, b
80.689° · 16.436°
Ecliptic λ, β
309.475° · 70.364°
HTM-20 index
410804603
Similar Worlds
Kepler-696 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.14 R⊕ · 4,619.8 ly
Kepler-87 c
Neptune-like · G-type yellow (Sun-like)
Radius 6.14 R⊕ · 4,021.2 ly
K2-157 c
Neptune-like · G-type yellow (Sun-like)
Radius 6.08 R⊕ · 973.2 ly
HD 34445 d
Neptune-like · G-type yellow (Sun-like)
Radius 6.07 R⊕ · 150.3 ly
TOI-2498 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.06 R⊕ · 897.8 ly
Kepler-1625 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.06 R⊕ · 7,534.6 ly