Key parameters at a glance

A radius of 2.12 Earth radii
A mass of 5.13 Earth masses
Surface gravity around 1.15 g
An orbital period of 14.155 days
Distance from Earth 1,605.23 light-years
Earth Similarity Index 0.764
Travel time at Voyager 1 speed 28,308,268 years

K2-177 b Planet Profile

Physical Specs

Radius

2.12 R⊕

Radius (Jupiter)

0.189 R♃

Mass

5.13 M⊕

Mass (Jupiter)

0.016 M♃

Density

2.97 g/cm³

Surface Gravity

1.15 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.764

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1802of 1978

top 91.1%

This planet

2.12R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-412 b 2.12 R⊕ Kepler-1828 b 2.12 R⊕ Kepler-1880 b 2.12 R⊕

Metric	Earth	K2-177 b	Jupiter
Radius (R⊕)	1.00	2.12	11.21
Mass (M⊕)	1.00	5.13	317.83
Density (g/cm³)	5.51	2.97	1.33
Surface Gravity (g)	1.00	1.15	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 114031109

Gaia DR2

Gaia DR2 63416845689590400

Gaia DR3

Gaia DR3 63416845689590400

System

K2-177

Percentile among Sub-Neptune cohort

Radius 2.116 R⊕ · percentile 9 / cohort 1978

Mass 5.130 M⊕ · percentile 10 / cohort 1978

Orbital period 14.16 d · percentile 48 / cohort 1946

Distance 492.17 pc · percentile 47 / cohort 1975

ESI 0.764 · percentile 98 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

14.155 days

Semi-major axis

— AU

Eccentricity

—

Inclination

87.22 °

Year Length

A year here lasts approximately 14.16 Earth days (3.9% of a terrestrial year).

Transit Fingerprint

Rp / R★

0.015987

Transit midpoint (BJD)

2,457,070.0802

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.764

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Mayo 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: K2-177

Spectral Class

F-type yellow-white

Effective Temperature

6,063 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.214 R☉

Stellar Mass

1.211 M☉

Metallicity [Fe/H]

0.41

Extended Stellar Properties

Surface gravity (log g)

4.380 dex

Stellar density

0.333 g/cm³

Systemic radial velocity

19.77 km/s

Metallicity ratio

[Fe/H]

Distance

492.17 parsec

Light-years 1,605.23 ly

V-band magnitude

12.68 mag

Voyager-speed travel 28,308,268 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

2.004 mas

Total Proper Motion

11.565 mas/yr

PM Right Ascension

11.52 mas/yr

PM Declination

0.96 mas/yr

Galactic Cartesian (pc)

x = 0.533 · y = 0.768 · z = 0.354

Equatorial (J2000)

RA 55.22962° · Dec 20.73609°

Galactic ℓ, b

167.936° · -26.968°

Ecliptic λ, β

57.758° · 1.104°

HTM-20 index

-885003405