Key parameters at a glance
- A radius of 2.01 Earth radii
- A mass of 4.70 Earth masses
- Surface gravity around 1.16 g
- An orbital period of 10.351 days
- Semi-major axis 0.0908 AU
- Equilibrium temperature 842 K (569 °C)
- Distance from Earth 4,465.86 light-years
- Earth Similarity Index 0.325
- Travel time at Voyager 1 speed 78,755,409 years
1 sibling around Kepler-903
Kepler-903 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-903 b this | Sub-Neptune | 2.01 | 4.70 | 10.351 | 842 | 2016 |
| Kepler-903 c | Sub-Neptune | 2.53 | 6.94 | 62.923 | 462 | 2016 |
Kepler-903 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1940of 1978
top 98.0%
This planet
2.01R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-903 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.01 | 11.21 |
| Mass (M⊕) | 1.00 | 4.70 | 317.83 |
| Density (g/cm³) | 5.51 | 3.18 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.16 | 2.53 |
| Insolation (S⊕) | 1.00 | 274.85 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 121732589
Gaia DR2
Gaia DR2 2101340791416961664
Gaia DR3
Gaia DR3 2101340791416961664
System
Kepler-903
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.35 Earth days (2.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0908 AU.
Transit Fingerprint
Depth
0.027 %
Duration
6.565 h
Impact parameter b
0.844
Rp / R★
0.018740
Transit midpoint (BJD)
2,454,966.7136
Photometric dip
Transit produces a flux drop of 273 ppm lasting ≈ 6.57 h.
Extended Orbital Architecture
Planet / star radius ratio
0.018740
Semi-major axis / stellar radius
7.200
Impact parameter (b)
0.844
Transit mid-time (BJD)
2,454,966.7136
Angular separation (arcsec)
0.06630
Eq. Temperature
842K
(569 °C)
Insolation (S⊕)
274.85
Earth = 1.00
Earth Similarity (ESI)
0.325
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
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-903
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,682 K — cooler than the Sun (5,778 K)
Estimated Age
4.79 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.970 R☉
Stellar Mass
0.980 M☉
Metallicity [Fe/H]
0.05
Extended Stellar Properties
Surface gravity (log g)
4.460 dex
Stellar density
0.240 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.702 mas
Total Proper Motion
5.365 mas/yr
PM Right Ascension
-1.00 mas/yr
PM Declination
-5.27 mas/yr
Galactic Cartesian (pc)
x = 0.244 · y = -0.718 · z = 0.652
Equatorial (J2000)
RA 288.77101° · Dec 40.66418°
Galactic ℓ, b
72.141° · 13.156°
Ecliptic λ, β
301.406° · 62.072°
HTM-20 index
-1418672197
Similar Worlds
Kepler-280 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.01 R⊕ · 2,545.2 ly
K2-80 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.01 R⊕ · 654.9 ly
Kepler-260 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.01 R⊕ · 2,046.2 ly
Kepler-1404 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.01 R⊕ · 3,138.2 ly
Kepler-754 b
Sub-Neptune · G-type yellow (Sun-like)
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HD 108236 f
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.02 R⊕ · 210.7 ly