Key parameters at a glance

A radius of 2.00 Earth radii
A mass of 4.66 Earth masses
Surface gravity around 1.17 g
An orbital period of 10.594 days
Semi-major axis 0.0727 AU
Distance from Earth 334.25 light-years
Earth Similarity Index 0.785
Travel time at Voyager 1 speed 5,894,577 years
Almost certainly tidally locked to its host star given the close orbit

K2-150 b Planet Profile

Physical Specs

Radius

2.00 R⊕

Radius (Jupiter)

0.178 R♃

Mass

4.66 M⊕

Mass (Jupiter)

0.015 M♃

Density

3.20 g/cm³

Surface Gravity

1.17 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.785

HZ Position Inner

Controversial No

Discovery

Year 2018

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1955of 1978

top 98.8%

This planet

2.00R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-32 c 2.00 R⊕ Kepler-238 f 2.00 R⊕ Kepler-242 c 2.00 R⊕

Metric	Earth	K2-150 b	Jupiter
Radius (R⊕)	1.00	2.00	11.21
Mass (M⊕)	1.00	4.66	317.83
Density (g/cm³)	5.51	3.20	1.33
Surface Gravity (g)	1.00	1.17	2.53
Insolation (S⊕)	1.00	4.90	0.037

Star Catalogue Identifiers

TIC

TIC 376879419

Gaia DR2

Gaia DR2 2579495171146737280

Gaia DR3

Gaia DR3 2579495171146737280

System

K2-150

Percentile among Sub-Neptune cohort

Radius 2.000 R⊕ · percentile 0 / cohort 1978

Mass 4.660 M⊕ · percentile 2 / cohort 1978

Orbital period 10.59 d · percentile 36 / cohort 1946

Distance 102.48 pc · percentile 20 / cohort 1975

ESI 0.785 · percentile 99 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

10.594 days

Semi-major axis

0.0727 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 10.59 Earth days (2.9% of a terrestrial year) at a mean orbital distance of 0.0727 AU.

Transit Fingerprint

Depth

0.210 %

Duration

2.400 h

Rp / R★

0.042000

Transit midpoint (BJD)

2,457,391.9616

Photometric dip

Transit produces a flux drop of 2,100 ppm lasting ≈ 2.40 h.

Extended Orbital Architecture

Planet / star radius ratio

0.042000

Semi-major axis / stellar radius

32.200

Transit mid-time (BJD)

2,457,391.9616

Angular separation (arcsec)

0.70900

Eq. Temperature

—

Insolation (S⊕)

4.90

Earth = 1.00

Earth Similarity (ESI)

0.785

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

Hirano et al. 2018

Instrument

Kepler CCD Array

Publication

2018-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2018 at K2 (12 shown).

K2-190 c · Rocky Terrestrial K2-183 b · Rocky Terrestrial K2-209 b · Rocky Terrestrial K2-210 b · Rocky Terrestrial K2-165 b · Super-Earth K2-169 b · Super-Earth K2-148 b · Super-Earth K2-219 b · Super-Earth K2-190 b · Super-Earth K2-200 b · Super-Earth K2-201 b · Super-Earth K2-170 b · Super-Earth

Host System: K2-150

Spectral Class

M-type red dwarf

Effective Temperature

3,499 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.436 R☉

Stellar Mass

0.457 M☉

Metallicity [Fe/H]

0.09

Extended Stellar Properties

Surface gravity (log g)

4.822 dex

Stellar density

8.036 g/cm³

Metallicity ratio

[Fe/H]

Distance

102.48 parsec

Light-years 334.25 ly

V-band magnitude

15.78 mag

Voyager-speed travel 5,894,577 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

9.730 mas

Total Proper Motion

53.264 mas/yr

PM Right Ascension

46.69 mas/yr

PM Declination

-25.63 mas/yr

Galactic Cartesian (pc)

x = 0.938 · y = 0.311 · z = 0.156

Equatorial (J2000)

RA 18.34439° · Dec 8.98743°

Galactic ℓ, b

132.063° · -53.495°

Ecliptic λ, β

20.326° · 1.127°

HTM-20 index

506718053