Key parameters at a glance

A radius of 2.26 Earth radii
A mass of 5.74 Earth masses
Surface gravity around 1.12 g
An orbital period of 44.998 days
Semi-major axis 0.2368 AU
Equilibrium temperature 508 K (235 °C)
Distance from Earth 2,823.03 light-years
Earth Similarity Index 0.508
Travel time at Voyager 1 speed 49,784,135 years

Kepler-1863 b Planet Profile

Physical Specs

Radius

2.26 R⊕

Radius (Jupiter)

0.202 R♃

Mass

5.74 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.72 g/cm³

Surface Gravity

1.12 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.508

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

#1570of 1978

top 79.3%

This planet

2.26R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-401 b 2.26 R⊕ TOI-1062 b 2.27 R⊕ Kepler-163 c 2.26 R⊕

Metric	Earth	Kepler-1863 b	Jupiter
Radius (R⊕)	1.00	2.26	11.21
Mass (M⊕)	1.00	5.74	317.83
Density (g/cm³)	5.51	2.72	1.33
Surface Gravity (g)	1.00	1.12	2.53
Insolation (S⊕)	1.00	41.50	0.037

Star Catalogue Identifiers

TIC

TIC 123416041

Gaia DR2

Gaia DR2 2105230794833800704

Gaia DR3

Gaia DR3 2105230794833800704

System

Kepler-1863

Percentile among Sub-Neptune cohort

Radius 2.263 R⊕ · percentile 21 / cohort 1978

Mass 5.740 M⊕ · percentile 21 / cohort 1978

Orbital period 45.00 d · percentile 83 / cohort 1946

Distance 865.55 pc · percentile 70 / cohort 1975

ESI 0.508 · percentile 71 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

44.998 days

Semi-major axis

0.2368 AU

Eccentricity

0.000

Inclination

86.35 °

Year Length

A year here lasts approximately 45.00 Earth days (12.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2368 AU.

Transit Fingerprint

Depth

0.017 %

Duration

9.686 h

Impact parameter b

0.758

Rp / R★

0.011593

Transit midpoint (BJD)

2,454,993.2298

Photometric dip

Transit produces a flux drop of 170 ppm lasting ≈ 9.69 h.

Extended Orbital Architecture

Planet / star radius ratio

0.011593

Semi-major axis / stellar radius

26.800

Impact parameter (b)

0.758

Transit mid-time (BJD)

2,454,993.2298

Angular separation (arcsec)

0.27400

Eq. Temperature

508K

(235 °C)

Insolation (S⊕)

41.50

Earth = 1.00

Earth Similarity (ESI)

0.508

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-1863

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,871 K — hotter than the Sun (5,778 K)

Estimated Age

12.02 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.983 R☉

Stellar Mass

1.097 M☉

Metallicity [Fe/H]

0.21

Extended Stellar Properties

Surface gravity (log g)

4.493 dex

Stellar density

0.029 g/cm³

Systemic radial velocity

-26.42 km/s

Rotational v·sin i

0.50 km/s

Metallicity ratio

[Fe/H]

Distance

865.55 parsec

Light-years 2,823.03 ly

V-band magnitude

13.64 mag

Voyager-speed travel 49,784,135 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.127 mas

Total Proper Motion

11.438 mas/yr

PM Right Ascension

8.27 mas/yr

PM Declination

7.90 mas/yr

Galactic Cartesian (pc)

x = 0.154 · y = -0.712 · z = 0.685

Equatorial (J2000)

RA 282.23972° · Dec 43.24409°

Galactic ℓ, b

72.698° · 18.627°

Ecliptic λ, β

292.080° · 65.748°

HTM-20 index

-557581386