Key parameters at a glance
- A radius of 2.12 Earth radii
- A mass of 37.19 Earth masses
- Surface gravity around 8.27 g
- An orbital period of 9.752 days
- Semi-major axis 0.0910 AU
- Equilibrium temperature 870 K (597 °C)
- Distance from Earth 4,455.52 light-years
- Earth Similarity Index 0.236
- Travel time at Voyager 1 speed 78,573,078 years
2 siblings around Kepler-53
Kepler-53 d 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-53 d this | Sub-Neptune | 2.12 | 37.19 | 9.752 | 870 | 2014 |
| Kepler-53 b | Sub-Neptune | 2.89 | 111.00 | 18.649 | 701 | 2012 |
| Kepler-53 c | Sub-Neptune | 3.17 | 36.00 | 38.558 | 550 | 2012 |
Kepler-53 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1782of 1978
top 90.0%
This planet
2.12R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-53 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.12 | 11.21 |
| Mass (M⊕) | 1.00 | 37.19 | 317.83 |
| Density (g/cm³) | 5.51 | 1.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 8.27 | 2.53 |
| Insolation (S⊕) | 1.00 | 144.85 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 37.191 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 122446315
Gaia DR2
Gaia DR2 2101188990094347648
Gaia DR3
Gaia DR3 2101188990094347648
System
Kepler-53
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.75 Earth days (2.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0910 AU.
Transit Fingerprint
Depth
0.042 %
Duration
4.190 h
Impact parameter b
0.810
Rp / R★
0.019870
Transit midpoint (BJD)
2,454,971.7852
Photometric dip
Transit produces a flux drop of 418 ppm lasting ≈ 4.19 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019870
Semi-major axis / stellar radius
6.000
Impact parameter (b)
0.810
Transit mid-time (BJD)
2,454,971.7852
Angular separation (arcsec)
0.06660
Eq. Temperature
870K
(597 °C)
Insolation (S⊕)
144.85
Earth = 1.00
Earth Similarity (ESI)
0.236
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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-53
Spectral Class
F-type yellow-white
Effective Temperature
6,085 K — hotter than the Sun (5,778 K)
Estimated Age
0.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.958 R☉
Stellar Mass
0.966 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.498 dex
Stellar density
0.850 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.704 mas
Total Proper Motion
6.761 mas/yr
PM Right Ascension
1.63 mas/yr
PM Declination
6.56 mas/yr
Galactic Cartesian (pc)
x = 0.266 · y = -0.712 · z = 0.650
Equatorial (J2000)
RA 290.46179° · Dec 40.56250°
Galactic ℓ, b
72.605° · 11.951°
Ecliptic λ, β
303.954° · 61.611°
HTM-20 index
-1060323308
Similar Worlds
Kepler-544 b
Sub-Neptune · F-type yellow-white
Radius 2.12 R⊕ · 3,141.5 ly
Kepler-814 b
Sub-Neptune · F-type yellow-white
Radius 2.12 R⊕ · 6,705.0 ly
Kepler-758 d
Sub-Neptune · F-type yellow-white
Radius 2.12 R⊕ · 4,899.9 ly
K2-177 b
Sub-Neptune · F-type yellow-white
Radius 2.12 R⊕ · 1,605.2 ly
Kepler-1580 b
Sub-Neptune · F-type yellow-white
Radius 2.11 R⊕ · 3,268.1 ly
Kepler-930 b
Sub-Neptune · F-type yellow-white
Radius 2.13 R⊕ · 2,767.1 ly