Key parameters at a glance

A radius of 2.13 Earth radii
A mass of 5.18 Earth masses
Surface gravity around 1.14 g
An orbital period of 9.591 days
Semi-major axis 0.0868 AU
Equilibrium temperature 1,087 K (814 °C)
Distance from Earth 1,104.11 light-years
Earth Similarity Index 0.242
Travel time at Voyager 1 speed 19,470,975 years

Kepler-971 b Planet Profile

Physical Specs

Radius

2.13 R⊕

Radius (Jupiter)

0.190 R♃

Mass

5.18 M⊕

Mass (Jupiter)

0.016 M♃

Density

2.95 g/cm³

Surface Gravity

1.14 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.242

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

#1765of 1978

top 89.2%

This planet

2.13R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-200 b 2.13 R⊕ Kepler-214 c 2.13 R⊕ HD 40307 f 2.13 R⊕

Metric	Earth	Kepler-971 b	Jupiter
Radius (R⊕)	1.00	2.13	11.21
Mass (M⊕)	1.00	5.18	317.83
Density (g/cm³)	5.51	2.95	1.33
Surface Gravity (g)	1.00	1.14	2.53
Insolation (S⊕)	1.00	82.77	0.037

Star Catalogue Identifiers

TIC

TIC 120105003

Gaia DR2

Gaia DR2 2103712163117363200

Gaia DR3

Gaia DR3 2103712163117363200

System

Kepler-971

Percentile among Sub-Neptune cohort

Radius 2.130 R⊕ · percentile 10 / cohort 1978

Mass 5.180 M⊕ · percentile 11 / cohort 1978

Orbital period 9.59 d · percentile 32 / cohort 1946

Distance 338.52 pc · percentile 38 / cohort 1975

ESI 0.242 · percentile 15 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

9.591 days

Semi-major axis

0.0868 AU

Eccentricity

0.000

Inclination

88.99 °

Year Length

A year here lasts approximately 9.59 Earth days (2.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0868 AU.

Transit Fingerprint

Depth

0.055 %

Duration

3.485 h

Impact parameter b

0.838

Rp / R★

0.023428

Transit midpoint (BJD)

2,454,965.6812

Photometric dip

Transit produces a flux drop of 555 ppm lasting ≈ 3.48 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023428

Semi-major axis / stellar radius

11.700

Impact parameter (b)

0.838

Transit mid-time (BJD)

2,454,965.6812

Angular separation (arcsec)

0.25600

Eq. Temperature

1,087K

(814 °C)

Insolation (S⊕)

82.77

Earth = 1.00

Earth Similarity (ESI)

0.242

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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-971

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,431 K — cooler than the Sun (5,778 K)

Estimated Age

4.47 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.850 R☉

Stellar Mass

0.880 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.540 dex

Stellar density

1.520 g/cm³

Metallicity ratio

[Fe/H]

Distance

338.52 parsec

Light-years 1,104.11 ly

V-band magnitude

13.48 mag

Voyager-speed travel 19,470,975 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

2.927 mas

Total Proper Motion

3.560 mas/yr

PM Right Ascension

-1.84 mas/yr

PM Declination

3.04 mas/yr

Galactic Cartesian (pc)

x = 0.183 · y = -0.730 · z = 0.658

Equatorial (J2000)

RA 284.09457° · Dec 41.18281°

Galactic ℓ, b

71.194° · 16.607°

Ecliptic λ, β

294.197° · 63.443°

HTM-20 index

1420673446