Key parameters at a glance
- A radius of 10.76 Earth radii
- A mass of 209.76 Earth masses
- Surface gravity around 1.81 g
- An orbital period of 4.943 days
- Semi-major axis 0.0571 AU
- Equilibrium temperature 1,251 K (978 °C)
- Distance from Earth 2,411.64 light-years
- Earth Similarity Index 0.119
- Travel time at Voyager 1 speed 42,529,209 years
Kepler-15 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1699of 1771
top 95.9%
This planet
10.76R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | Kepler-15 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.76 | 11.21 |
| Mass (M⊕) | 1.00 | 209.76 | 317.83 |
| Density (g/cm³) | 5.51 | 0.93 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.81 | 2.53 |
| Insolation (S⊕) | 1.00 | 430.68 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 209.760 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 27774415
Gaia DR2
Gaia DR2 2134850847813263360
Gaia DR3
Gaia DR3 2134850847813263360
System
Kepler-15
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.94 Earth days (1.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0571 AU.
Transit Fingerprint
Depth
1.127 %
Duration
3.500 h
Impact parameter b
0.554
Rp / R★
0.099600
Transit midpoint (BJD)
2,454,969.3287
Photometric dip
Transit produces a flux drop of 11,265 ppm lasting ≈ 3.50 h.
Extended Orbital Architecture
Planet / star radius ratio
0.099600
Semi-major axis / stellar radius
12.800
Impact parameter (b)
0.554
RV semi-amplitude (K)
78.700 m/s
Transit mid-time (BJD)
2,454,969.3287
Angular separation (arcsec)
0.07730
Eq. Temperature
1,251K
(978 °C)
Insolation (S⊕)
430.68
Earth = 1.00
Earth Similarity (ESI)
0.119
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Endl et al. 2011Instrument
Kepler CCD Array
Publication
2011-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2011 at Kepler (12 shown).
Host System: Kepler-15
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,515 K — cooler than the Sun (5,778 K)
Estimated Age
3.70 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.992 R☉
Stellar Mass
1.018 M☉
Metallicity [Fe/H]
0.36
Extended Stellar Properties
Surface gravity (log g)
4.460 dex
Stellar density
1.470 g/cm³
Systemic radial velocity
-20.00 km/s
Rotational v·sin i
2.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.324 mas
Total Proper Motion
12.436 mas/yr
PM Right Ascension
-2.78 mas/yr
PM Declination
-12.12 mas/yr
Galactic Cartesian (pc)
x = 0.289 · y = -0.587 · z = 0.756
Equatorial (J2000)
RA 296.20055° · Dec 49.14003°
Galactic ℓ, b
82.304° · 12.153°
Ecliptic λ, β
320.542° · 68.032°
HTM-20 index
1796650291
Similar Worlds
TOI-5027 b
Gas Giant · G-type yellow (Sun-like)
Radius 10.76 R⊕ · 666.8 ly
TOI-2158 b
Gas Giant · G-type yellow (Sun-like)
Radius 10.76 R⊕ · 647.3 ly
Kepler-77 b
Gas Giant · G-type yellow (Sun-like)
Radius 10.76 R⊕ · 2,085.5 ly
TOI-375 b
Gas Giant · G-type yellow (Sun-like)
Radius 10.77 R⊕ · 1,292.3 ly
TOI-5210 b
Gas Giant · G-type yellow (Sun-like)
Radius 10.73 R⊕ · 985.3 ly
Kepler-725 b
Gas Giant · G-type yellow (Sun-like)
Radius 10.80 R⊕ · 2,473.8 ly