Key parameters at a glance

A radius of 2.55 Earth radii
A mass of 7.04 Earth masses
Surface gravity around 1.08 g
An orbital period of 11.018 days
Semi-major axis 0.0976 AU
Equilibrium temperature 840 K (567 °C)
Distance from Earth 5,957.34 light-years
Earth Similarity Index 0.299
Travel time at Voyager 1 speed 105,057,635 years

Kepler-1211 b Planet Profile

Physical Specs

Radius

2.55 R⊕

Radius (Jupiter)

0.228 R♃

Mass

7.04 M⊕

Mass (Jupiter)

0.022 M♃

Density

2.33 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.299

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

#1105of 1978

top 55.8%

This planet

2.55R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-156 c 2.55 R⊕ Kepler-1535 b 2.55 R⊕ Kepler-1043 b 2.55 R⊕

Metric	Earth	Kepler-1211 b	Jupiter
Radius (R⊕)	1.00	2.55	11.21
Mass (M⊕)	1.00	7.04	317.83
Density (g/cm³)	5.51	2.33	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	130.90	0.037

Star Catalogue Identifiers

TIC

TIC 120578889

Gaia DR2

Gaia DR2 2103785516859681152

Gaia DR3

Gaia DR3 2103785516859681152

System

Kepler-1211

Percentile among Sub-Neptune cohort

Radius 2.550 R⊕ · percentile 44 / cohort 1978

Mass 7.040 M⊕ · percentile 41 / cohort 1978

Orbital period 11.02 d · percentile 38 / cohort 1946

Distance 1,826.53 pc · percentile 96 / cohort 1975

ESI 0.299 · percentile 28 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

11.018 days

Semi-major axis

0.0976 AU

Eccentricity

0.000

Inclination

84.66 °

Year Length

A year here lasts approximately 11.02 Earth days (3.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0976 AU.

Transit Fingerprint

Depth

0.055 %

Duration

4.531 h

Impact parameter b

0.883

Rp / R★

0.025462

Transit midpoint (BJD)

2,454,972.8804

Photometric dip

Transit produces a flux drop of 546 ppm lasting ≈ 4.53 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025462

Semi-major axis / stellar radius

9.490

Impact parameter (b)

0.883

Transit mid-time (BJD)

2,454,972.8804

Angular separation (arcsec)

0.05350

Eq. Temperature

840K

(567 °C)

Insolation (S⊕)

130.90

Earth = 1.00

Earth Similarity (ESI)

0.299

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-1211

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,705 K — cooler than the Sun (5,778 K)

Estimated Age

4.17 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.940 R☉

Stellar Mass

0.960 M☉

Metallicity [Fe/H]

-0.08

Extended Stellar Properties

Surface gravity (log g)

4.480 dex

Stellar density

0.800 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,826.53 parsec

Light-years 5,957.34 ly

V-band magnitude

16.02 mag

Voyager-speed travel 105,057,635 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.518 mas

Total Proper Motion

11.767 mas/yr

PM Right Ascension

-3.19 mas/yr

PM Declination

-11.33 mas/yr

Galactic Cartesian (pc)

x = 0.205 · y = -0.728 · z = 0.654

Equatorial (J2000)

RA 285.72076° · Dec 40.85691°

Galactic ℓ, b

71.364° · 15.349°

Ecliptic λ, β

296.679° · 62.847°

HTM-20 index

1823985603