Key parameters at a glance

A radius of 3.96 Earth radii
A mass of 14.90 Earth masses
Surface gravity around 0.95 g
An orbital period of 105.956 days
Semi-major axis 0.4217 AU
Equilibrium temperature 324 K (51 °C)
Distance from Earth 3,302.04 light-years
Earth Similarity Index 0.585
Travel time at Voyager 1 speed 58,231,401 years

Kepler-976 b Planet Profile

Physical Specs

Radius

3.96 R⊕

Radius (Jupiter)

0.353 R♃

Mass

14.90 M⊕

Mass (Jupiter)

0.047 M♃

Density

1.32 g/cm³

Surface Gravity

0.95 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.585

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

#4of 1978

top 0.2%

This planet

3.96R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-149 d 3.96 R⊕ Kepler-1405 b 3.96 R⊕ Kepler-278 b 3.96 R⊕

Metric	Earth	Kepler-976 b	Jupiter
Radius (R⊕)	1.00	3.96	11.21
Mass (M⊕)	1.00	14.90	317.83
Density (g/cm³)	5.51	1.32	1.33
Surface Gravity (g)	1.00	0.95	2.53
Insolation (S⊕)	1.00	2.66	0.037

Star Catalogue Identifiers

TIC

TIC 159174942

Gaia DR2

Gaia DR2 2127721958016074368

Gaia DR3

Gaia DR3 2127721958016074368

System

Kepler-976

Percentile among Sub-Neptune cohort

Radius 3.960 R⊕ · percentile 100 / cohort 1978

Mass 14.900 M⊕ · percentile 93 / cohort 1978

Orbital period 105.96 d · percentile 95 / cohort 1946

Distance 1,012.41 pc · percentile 79 / cohort 1975

ESI 0.585 · percentile 81 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

105.956 days

Semi-major axis

0.4217 AU

Eccentricity

0.000

Inclination

89.84 °

Year Length

A year here lasts approximately 105.96 Earth days (29.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.4217 AU.

Transit Fingerprint

Depth

0.229 %

Duration

6.986 h

Impact parameter b

0.322

Rp / R★

0.043880

Transit midpoint (BJD)

2,455,015.0537

Photometric dip

Transit produces a flux drop of 2,286 ppm lasting ≈ 6.99 h.

Extended Orbital Architecture

Planet / star radius ratio

0.043880

Semi-major axis / stellar radius

120.949

Impact parameter (b)

0.322

Transit mid-time (BJD)

2,455,015.0537

Angular separation (arcsec)

0.41700

Eq. Temperature

324K

(51 °C)

Insolation (S⊕)

2.66

Earth = 1.00

Earth Similarity (ESI)

0.585

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.

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-976

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,232 K — cooler than the Sun (5,778 K)

Estimated Age

4.68 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.830 R☉

Stellar Mass

0.870 M☉

Metallicity [Fe/H]

0.07

Extended Stellar Properties

Surface gravity (log g)

4.550 dex

Stellar density

2.549 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,012.41 parsec

Light-years 3,302.04 ly

V-band magnitude

15.86 mag

Voyager-speed travel 58,231,401 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.960 mas

Total Proper Motion

8.955 mas/yr

PM Right Ascension

-5.97 mas/yr

PM Declination

-6.67 mas/yr

Galactic Cartesian (pc)

x = 0.233 · y = -0.645 · z = 0.728

Equatorial (J2000)

RA 289.86962° · Dec 46.72969°

Galactic ℓ, b

78.177° · 14.926°

Ecliptic λ, β

307.661° · 67.588°

HTM-20 index

1807543382