Key parameters at a glance

A radius of 0.69 Earth radii
A mass of 0.26 Earth masses
Surface gravity around 0.54 g
An orbital period of 4.655 days
Semi-major axis 0.0480 AU
Distance from Earth 161.07 light-years
Earth Similarity Index 0.861
Travel time at Voyager 1 speed 2,840,536 years
Almost certainly tidally locked to its host star given the close orbit

K2-116 b Planet Profile

Physical Specs

Radius

0.69 R⊕

Radius (Jupiter)

0.062 R♃

Mass

0.26 M⊕

Mass (Jupiter)

0.001 M♃

Density

4.30 g/cm³

Surface Gravity

0.54 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.861

HZ Position Inner

Controversial No

Discovery

Year 2017

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#533of 570

top 93.3%

This planet

0.69R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-141 b 0.69 R⊕ Proxima Cen d 0.69 R⊕ EPIC 201497682 b 0.69 R⊕

Metric	Earth	K2-116 b	Jupiter
Radius (R⊕)	1.00	0.69	11.21
Mass (M⊕)	1.00	0.26	317.83
Density (g/cm³)	5.51	4.30	1.33
Surface Gravity (g)	1.00	0.54	2.53
Insolation (S⊕)	1.00	78.60	0.037

Star Catalogue Identifiers

HIP

HIP 110620

TIC

TIC 39936432

Gaia DR2

Gaia DR2 2602406721431348096

Gaia DR3

Gaia DR3 2602406721431348096

System

K2-116

Percentile among Rocky Terrestrial cohort

Radius 0.690 R⊕ · percentile 6 / cohort 570

Mass 0.257 M⊕ · percentile 5 / cohort 570

Orbital period 4.66 d · percentile 51 / cohort 567

Distance 49.39 pc · percentile 18 / cohort 566

ESI 0.861 · percentile 89 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

4.655 days

Semi-major axis

0.0480 AU

Eccentricity

0.060

Inclination

89.09 °

Year Length

A year here lasts approximately 4.66 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0480 AU.

Transit Fingerprint

Depth

0.013 %

Duration

1.890 h

Impact parameter b

0.100

Rp / R★

0.009402

Transit midpoint (BJD)

2,456,979.9480

Photometric dip

Transit produces a flux drop of 129 ppm lasting ≈ 1.89 h.

Extended Orbital Architecture

Planet / star radius ratio

0.009402

Semi-major axis / stellar radius

15.370

Impact parameter (b)

0.100

Transit mid-time (BJD)

2,456,979.9480

Long. of periastron (ω)

-23.44°

Angular separation (arcsec)

0.97200

Eq. Temperature

—

Insolation (S⊕)

78.60

Earth = 1.00

Earth Similarity (ESI)

0.861

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Dressing et al. 2017

Instrument

Kepler CCD Array

Publication

2017-11

Observation locale

Space

Discovery cohort

Planets confirmed in 2017 at K2 (12 shown).

K2-129 b · Rocky Terrestrial K2-130 b · Super-Earth K2-133 b · Super-Earth K2-128 b · Super-Earth K2-133 c · Super-Earth K2-125 b · Sub-Neptune K2-118 b · Sub-Neptune K2-136 d · Super-Earth K2-123 b · Sub-Neptune K2-136 c · Sub-Neptune K2-124 b · Sub-Neptune K2-117 c · Sub-Neptune

Host System: K2-116

Spectral Class

K-type orange

Effective Temperature

4,348 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.669 R☉

Stellar Mass

0.695 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.640 dex

Stellar density

2.189 g/cm³

Systemic radial velocity

-18.91 km/s

Metallicity ratio

[Fe/H]

Distance

49.39 parsec

Light-years 161.07 ly

V-band magnitude

10.80 mag

Voyager-speed travel 2,840,536 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

20.220 mas

Total Proper Motion

223.156 mas/yr

PM Right Ascension

168.97 mas/yr

PM Declination

-145.76 mas/yr

Galactic Cartesian (pc)

x = 0.896 · y = -0.396 · z = -0.201

Equatorial (J2000)

RA 336.15234° · Dec -11.57932°

Galactic ℓ, b

49.973° · -52.233°

Ecliptic λ, β

333.675° · -1.525°

HTM-20 index

266927122