Key parameters at a glance
- A radius of 4.11 Earth radii
- A mass of 15.80 Earth masses
- Surface gravity around 0.94 g
- An orbital period of 8.575 days
- Semi-major axis 0.0947 AU
- Equilibrium temperature 1,374 K (1101 °C)
- Distance from Earth 4,107.22 light-years
- Earth Similarity Index 0.143
- Travel time at Voyager 1 speed 72,430,773 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-815 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#545of 574
top 94.8%
This planet
4.11R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-815 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.11 | 11.21 |
| Mass (M⊕) | 1.00 | 15.80 | 317.83 |
| Density (g/cm³) | 5.51 | 1.25 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.94 | 2.53 |
| Insolation (S⊕) | 1.00 | 979.14 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 48505882
Gaia DR2
Gaia DR2 2131495378841740800
Gaia DR3
Gaia DR3 2131495378841740800
System
Kepler-815
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.58 Earth days (2.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0947 AU.
Transit Fingerprint
Depth
0.016 %
Duration
8.545 h
Impact parameter b
0.351
Rp / R★
0.011420
Transit midpoint (BJD)
2,454,973.1388
Photometric dip
Transit produces a flux drop of 161 ppm lasting ≈ 8.55 h.
Extended Orbital Architecture
Planet / star radius ratio
0.011420
Semi-major axis / stellar radius
7.617
Impact parameter (b)
0.351
Transit mid-time (BJD)
2,454,973.1388
Angular separation (arcsec)
0.07520
Eq. Temperature
1,374K
(1101 °C)
Insolation (S⊕)
979.14
Earth = 1.00
Earth Similarity (ESI)
0.143
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. 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-815
Spectral Class
K-type orange
Effective Temperature
5,028 K — cooler than the Sun (5,778 K)
Estimated Age
4.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
3.420 R☉
Stellar Mass
1.250 M☉
Metallicity [Fe/H]
-0.03
Extended Stellar Properties
Surface gravity (log g)
3.460 dex
Stellar density
0.040 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.765 mas
Total Proper Motion
8.528 mas/yr
PM Right Ascension
2.41 mas/yr
PM Declination
-8.18 mas/yr
Galactic Cartesian (pc)
x = 0.176 · y = -0.647 · z = 0.742
Equatorial (J2000)
RA 285.22112° · Dec 47.88130°
Galactic ℓ, b
78.045° · 18.278°
Ecliptic λ, β
300.516° · 69.713°
HTM-20 index
-97560554
Similar Worlds
HD 77338 b
Neptune-like · K-type orange
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Kepler-247 c
Neptune-like · K-type orange
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TOI-1272 b
Neptune-like · K-type orange
Radius 4.13 R⊕ · 448.7 ly
Kepler-1993 b
Neptune-like · K-type orange
Radius 4.15 R⊕ · 3,365.6 ly
Kepler-248 c
Neptune-like · K-type orange
Radius 4.07 R⊕ · 2,409.6 ly
HD 190007 b
Neptune-like · K-type orange
Radius 4.06 R⊕ · 41.5 ly