Key parameters at a glance

A radius of 1.64 Earth radii
A mass of 3.33 Earth masses
Surface gravity around 1.24 g
An orbital period of 11.332 days
Semi-major axis 0.0830 AU
Distance from Earth 403.38 light-years
Earth Similarity Index 0.859
Travel time at Voyager 1 speed 7,113,548 years
Almost certainly tidally locked to its host star given the close orbit

K2-149 b Planet Profile

Physical Specs

Radius

1.64 R⊕

Radius (Jupiter)

0.146 R♃

Mass

3.33 M⊕

Mass (Jupiter)

0.011 M♃

Density

4.15 g/cm³

Surface Gravity

1.24 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.859

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

#495of 1176

top 42.0%

This planet

1.64R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-46 d 1.64 R⊕ Kepler-179 b 1.64 R⊕ Kepler-247 b 1.64 R⊕

Metric	Earth	K2-149 b	Jupiter
Radius (R⊕)	1.00	1.64	11.21
Mass (M⊕)	1.00	3.33	317.83
Density (g/cm³)	5.51	4.15	1.33
Surface Gravity (g)	1.00	1.24	2.53
Insolation (S⊕)	1.00	7.00	0.037

Star Catalogue Identifiers

TIC

TIC 429035886

Gaia DR2

Gaia DR2 2557342829345854208

Gaia DR3

Gaia DR3 2557342829345854208

System

K2-149

Percentile among Super-Earth cohort

Radius 1.640 R⊕ · percentile 56 / cohort 1176

Mass 3.330 M⊕ · percentile 51 / cohort 1176

Orbital period 11.33 d · percentile 68 / cohort 1164

Distance 123.68 pc · percentile 19 / cohort 1171

ESI 0.859 · percentile 94 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

11.332 days

Semi-major axis

0.0830 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 11.33 Earth days (3.1% of a terrestrial year) at a mean orbital distance of 0.0830 AU.

Transit Fingerprint

Rp / R★

0.026400

Transit midpoint (BJD)

2,457,388.3383

Extended Orbital Architecture

Planet / star radius ratio

0.026400

Semi-major axis / stellar radius

34.300

Transit mid-time (BJD)

2,457,388.3383

Angular separation (arcsec)

0.67100

Eq. Temperature

—

Insolation (S⊕)

7.00

Earth = 1.00

Earth Similarity (ESI)

0.859

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: K2-149

Spectral Class

M-type red dwarf

Effective Temperature

3,745 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.568 R☉

Stellar Mass

0.595 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.707 dex

Stellar density

3.932 g/cm³

Metallicity ratio

[Fe/H]

Distance

123.68 parsec

Light-years 403.38 ly

V-band magnitude

14.54 mag

Voyager-speed travel 7,113,548 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

8.057 mas

Total Proper Motion

38.684 mas/yr

PM Right Ascension

-31.02 mas/yr

PM Declination

-23.11 mas/yr

Galactic Cartesian (pc)

x = 0.977 · y = 0.169 · z = 0.127

Equatorial (J2000)

RA 9.82175° · Dec 7.27699°

Galactic ℓ, b

117.611° · -55.469°

Ecliptic λ, β

11.877° · 2.803°

HTM-20 index

1492844489