Key parameters at a glance

A radius of 1.92 Earth radii
A mass of 4.35 Earth masses
Surface gravity around 1.18 g
An orbital period of 21.170 days
Semi-major axis 0.1195 AU
Equilibrium temperature 431 K (158 °C)
Distance from Earth 607.29 light-years
Earth Similarity Index 0.621
Travel time at Voyager 1 speed 10,709,606 years
Almost certainly tidally locked to its host star given the close orbit

EPIC 211822797 b Planet Profile

Physical Specs

Radius

1.92 R⊕

Radius (Jupiter)

0.171 R♃

Mass

4.35 M⊕

Mass (Jupiter)

0.014 M♃

Density

3.38 g/cm³

Surface Gravity

1.18 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.621

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#102of 1176

top 8.6%

This planet

1.92R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

K2-61 b 1.92 R⊕ Kepler-1119 b 1.92 R⊕ HD 3167 d 1.92 R⊕

Metric	Earth	EPIC 211822797 b	Jupiter
Radius (R⊕)	1.00	1.92	11.21
Mass (M⊕)	1.00	4.35	317.83
Density (g/cm³)	5.51	3.38	1.33
Surface Gravity (g)	1.00	1.18	2.53
Insolation (S⊕)	1.00	3.50	0.037

Star Catalogue Identifiers

TIC

TIC 337632006

Gaia DR2

Gaia DR2 658607950370340608

Gaia DR3

Gaia DR3 658607950370340608

System

EPIC 211822797

Percentile among Super-Earth cohort

Radius 1.920 R⊕ · percentile 90 / cohort 1176

Mass 4.350 M⊕ · percentile 84 / cohort 1176

Orbital period 21.17 d · percentile 87 / cohort 1164

Distance 186.20 pc · percentile 23 / cohort 1171

ESI 0.621 · percentile 81 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

21.170 days

Semi-major axis

0.1195 AU

Eccentricity

0.060

Inclination

89.73 °

Year Length

A year here lasts approximately 21.17 Earth days (5.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1195 AU.

Transit Fingerprint

Depth

0.104 %

Duration

3.576 h

Impact parameter b

0.380

Rp / R★

0.030300

Transit midpoint (BJD)

2,457,144.4053

Photometric dip

Transit produces a flux drop of 1,041 ppm lasting ≈ 3.58 h.

Extended Orbital Architecture

Planet / star radius ratio

0.030300

Semi-major axis / stellar radius

44.370

Impact parameter (b)

0.380

Transit mid-time (BJD)

2,457,144.4053

Long. of periastron (ω)

0.00°

Angular separation (arcsec)

0.64200

Eq. Temperature

431K

(158 °C)

Insolation (S⊕)

3.50

Earth = 1.00

Earth Similarity (ESI)

0.621

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Mann et al. 2017

Instrument

Kepler CCD Array

Publication

2017-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at K2 (12 shown).

K2-72 d · Rocky Terrestrial K2-72 b · Rocky Terrestrial K2-91 b · Rocky Terrestrial K2-72 c · Rocky Terrestrial K2-102 b · Super-Earth K2-90 c · Super-Earth K2-72 e · Super-Earth K2-83 b · Rocky Terrestrial K2-88 b · Rocky Terrestrial K2-80 c · Super-Earth K2-83 c · Super-Earth K2-65 b · Super-Earth

Host System: EPIC 211822797

Spectral Class

M-type red dwarf

Effective Temperature

4,057 K — cooler than the Sun (5,778 K)

Estimated Age

0.79 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.580 R☉

Stellar Mass

0.620 M☉

Metallicity [Fe/H]

0.20

Extended Stellar Properties

Surface gravity (log g)

4.700 dex

Stellar density

3.880 g/cm³

Systemic radial velocity

34.85 km/s

Rotational v·sin i

2.60 km/s

Rotation period

14.60 days

Metallicity ratio

[Fe/H]

Distance

186.20 parsec

Light-years 607.29 ly

V-band magnitude

15.13 mag

Voyager-speed travel 10,709,606 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

5.342 mas

Total Proper Motion

37.924 mas/yr

PM Right Ascension

-36.17 mas/yr

PM Declination

-11.40 mas/yr

Galactic Cartesian (pc)

x = -0.618 · y = 0.726 · z = 0.303

Equatorial (J2000)

RA 130.41021° · Dec 17.63997°

Galactic ℓ, b

208.283° · 32.037°

Ecliptic λ, β

128.152° · -0.608°

HTM-20 index

-1882697880