Key parameters at a glance

A radius of 2.29 Earth radii
A mass of 5.85 Earth masses
Surface gravity around 1.12 g
An orbital period of 17.068 days
Semi-major axis 0.1321 AU
Equilibrium temperature 769 K (496 °C)
Distance from Earth 5,790.70 light-years
Earth Similarity Index 0.341
Travel time at Voyager 1 speed 102,119,061 years

Kepler-1903 b Planet Profile

Physical Specs

Radius

2.29 R⊕

Radius (Jupiter)

0.204 R♃

Mass

5.85 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.69 g/cm³

Surface Gravity

1.12 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.341

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1534of 1978

top 77.5%

This planet

2.29R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1712 b 2.28 R⊕ Kepler-1760 b 2.29 R⊕ Kepler-626 b 2.29 R⊕

Metric	Earth	Kepler-1903 b	Jupiter
Radius (R⊕)	1.00	2.29	11.21
Mass (M⊕)	1.00	5.85	317.83
Density (g/cm³)	5.51	2.69	1.33
Surface Gravity (g)	1.00	1.12	2.53
Insolation (S⊕)	1.00	82.56	0.037

Star Catalogue Identifiers

TIC

TIC 417655814

Gaia DR2

Gaia DR2 2136206476929730688

Gaia DR3

Gaia DR3 2136206476929730688

System

Kepler-1903

Percentile among Sub-Neptune cohort

Radius 2.286 R⊕ · percentile 22 / cohort 1978

Mass 5.850 M⊕ · percentile 22 / cohort 1978

Orbital period 17.07 d · percentile 56 / cohort 1946

Distance 1,775.44 pc · percentile 96 / cohort 1975

ESI 0.341 · percentile 38 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

17.068 days

Semi-major axis

0.1321 AU

Eccentricity

0.000

Inclination

89.72 °

Year Length

A year here lasts approximately 17.07 Earth days (4.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1321 AU.

Transit Fingerprint

Depth

0.026 %

Duration

6.165 h

Impact parameter b

0.106

Rp / R★

0.014940

Transit midpoint (BJD)

2,454,978.5734

Photometric dip

Transit produces a flux drop of 262 ppm lasting ≈ 6.17 h.

Extended Orbital Architecture

Planet / star radius ratio

0.014940

Semi-major axis / stellar radius

21.400

Impact parameter (b)

0.106

Transit mid-time (BJD)

2,454,978.5734

Angular separation (arcsec)

0.07440

Eq. Temperature

769K

(496 °C)

Insolation (S⊕)

82.56

Earth = 1.00

Earth Similarity (ESI)

0.341

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

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1903

Spectral Class

F-type yellow-white

Effective Temperature

6,347 K — hotter than the Sun (5,778 K)

Estimated Age

0.23 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.996 R☉

Stellar Mass

1.053 M☉

Metallicity [Fe/H]

-0.34

Extended Stellar Properties

Surface gravity (log g)

4.464 dex

Stellar density

0.677 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,775.44 parsec

Light-years 5,790.70 ly

V-band magnitude

15.46 mag

Voyager-speed travel 102,119,061 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.534 mas

Total Proper Motion

4.153 mas/yr

PM Right Ascension

-3.04 mas/yr

PM Declination

-2.83 mas/yr

Galactic Cartesian (pc)

x = 0.223 · y = -0.585 · z = 0.780

Equatorial (J2000)

RA 290.88830° · Dec 51.24816°

Galactic ℓ, b

82.751° · 16.129°

Ecliptic λ, β

314.593° · 71.466°

HTM-20 index

220198699