Key parameters at a glance

A radius of 3.74 Earth radii
A mass of 13.50 Earth masses
Surface gravity around 0.97 g
An orbital period of 22.046 days
Semi-major axis 0.1572 AU
Equilibrium temperature 640 K (367 °C)
Distance from Earth 6,445.01 light-years
Earth Similarity Index 0.336
Travel time at Voyager 1 speed 113,657,668 years

Kepler-871 b Planet Profile

Physical Specs

Radius

3.74 R⊕

Radius (Jupiter)

0.334 R♃

Mass

13.50 M⊕

Mass (Jupiter)

0.042 M♃

Density

1.42 g/cm³

Surface Gravity

0.97 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.336

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

#75of 1978

top 3.7%

This planet

3.74R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

DMPP-6 c 3.74 R⊕ HD 191939 g 3.74 R⊕ TOI-682.01 3.74 R⊕

Metric	Earth	Kepler-871 b	Jupiter
Radius (R⊕)	1.00	3.74	11.21
Mass (M⊕)	1.00	13.50	317.83
Density (g/cm³)	5.51	1.42	1.33
Surface Gravity (g)	1.00	0.97	2.53
Insolation (S⊕)	1.00	79.72	0.037

Star Catalogue Identifiers

TIC

TIC 271158815

Gaia DR2

Gaia DR2 2078175627609397376

Gaia DR3

Gaia DR3 2078175627609397376

System

Kepler-871

Percentile among Sub-Neptune cohort

Radius 3.740 R⊕ · percentile 96 / cohort 1978

Mass 13.500 M⊕ · percentile 89 / cohort 1978

Orbital period 22.05 d · percentile 66 / cohort 1946

Distance 1,976.05 pc · percentile 97 / cohort 1975

ESI 0.336 · percentile 37 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

22.046 days

Semi-major axis

0.1572 AU

Eccentricity

0.000

Inclination

87.53 °

Year Length

A year here lasts approximately 22.05 Earth days (6.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1572 AU.

Transit Fingerprint

Depth

0.080 %

Duration

5.060 h

Impact parameter b

0.918

Rp / R★

0.030264

Transit midpoint (BJD)

2,454,969.4783

Photometric dip

Transit produces a flux drop of 805 ppm lasting ≈ 5.06 h.

Extended Orbital Architecture

Planet / star radius ratio

0.030264

Semi-major axis / stellar radius

14.100

Impact parameter (b)

0.918

Transit mid-time (BJD)

2,454,969.4783

Angular separation (arcsec)

0.07960

Eq. Temperature

640K

(367 °C)

Insolation (S⊕)

79.72

Earth = 1.00

Earth Similarity (ESI)

0.336

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-871

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,993 K — hotter than the Sun (5,778 K)

Estimated Age

3.47 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.140 R☉

Stellar Mass

1.110 M☉

Metallicity [Fe/H]

0.09

Extended Stellar Properties

Surface gravity (log g)

4.370 dex

Stellar density

0.438 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,976.05 parsec

Light-years 6,445.01 ly

V-band magnitude

15.88 mag

Voyager-speed travel 113,657,668 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.478 mas

Total Proper Motion

7.365 mas/yr

PM Right Ascension

-5.00 mas/yr

PM Declination

-5.40 mas/yr

Galactic Cartesian (pc)

x = 0.302 · y = -0.661 · z = 0.687

Equatorial (J2000)

RA 294.52706° · Dec 43.36813°

Galactic ℓ, b

76.541° · 10.502°

Ecliptic λ, β

312.125° · 63.265°

HTM-20 index

-1470212586