Key parameters at a glance

A radius of 3.61 Earth radii
A mass of 12.70 Earth masses
Surface gravity around 0.97 g
An orbital period of 40.429 days
Semi-major axis 0.2244 AU
Equilibrium temperature 494 K (221 °C)
Distance from Earth 3,064.09 light-years
Earth Similarity Index 0.432
Travel time at Voyager 1 speed 54,035,204 years

Kepler-869 b Planet Profile

Physical Specs

Radius

3.61 R⊕

Radius (Jupiter)

0.322 R♃

Mass

12.70 M⊕

Mass (Jupiter)

0.040 M♃

Density

1.48 g/cm³

Surface Gravity

0.97 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.432

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#132of 1978

top 6.6%

This planet

3.61R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 96700 d 3.61 R⊕ Kepler-258 c 3.61 R⊕ HIP 35173 b 3.61 R⊕

Metric	Earth	Kepler-869 b	Jupiter
Radius (R⊕)	1.00	3.61	11.21
Mass (M⊕)	1.00	12.70	317.83
Density (g/cm³)	5.51	1.48	1.33
Surface Gravity (g)	1.00	0.97	2.53
Insolation (S⊕)	1.00	17.23	0.037

Star Catalogue Identifiers

TIC

TIC 299218299

Gaia DR2

Gaia DR2 2133140076439141376

Gaia DR3

Gaia DR3 2133140076439141376

System

Kepler-869

Percentile among Sub-Neptune cohort

Radius 3.610 R⊕ · percentile 93 / cohort 1978

Mass 12.700 M⊕ · percentile 86 / cohort 1978

Orbital period 40.43 d · percentile 81 / cohort 1946

Distance 939.46 pc · percentile 74 / cohort 1975

ESI 0.432 · percentile 59 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

40.429 days

Semi-major axis

0.2244 AU

Eccentricity

0.000

Inclination

87.92 °

Year Length

A year here lasts approximately 40.43 Earth days (11.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2244 AU.

Transit Fingerprint

Depth

0.092 %

Duration

7.553 h

Impact parameter b

0.890

Rp / R★

0.035465

Transit midpoint (BJD)

2,454,972.5023

Photometric dip

Transit produces a flux drop of 916 ppm lasting ≈ 7.55 h.

Extended Orbital Architecture

Planet / star radius ratio

0.035465

Semi-major axis / stellar radius

22.500

Impact parameter (b)

0.890

Transit mid-time (BJD)

2,454,972.5023

Angular separation (arcsec)

0.23900

Eq. Temperature

494K

(221 °C)

Insolation (S⊕)

17.23

Earth = 1.00

Earth Similarity (ESI)

0.432

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. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-869

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,664 K — cooler than the Sun (5,778 K)

Estimated Age

4.79 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.950 R☉

Stellar Mass

0.970 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

0.089 g/cm³

Metallicity ratio

[Fe/H]

Distance

939.46 parsec

Light-years 3,064.09 ly

V-band magnitude

15.12 mag

Voyager-speed travel 54,035,204 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.036 mas

Total Proper Motion

2.753 mas/yr

PM Right Ascension

1.00 mas/yr

PM Declination

2.57 mas/yr

Galactic Cartesian (pc)

x = 0.209 · y = -0.594 · z = 0.777

Equatorial (J2000)

RA 289.42460° · Dec 50.99412°

Galactic ℓ, b

82.133° · 16.875°

Ecliptic λ, β

311.629° · 71.635°

HTM-20 index

221215551