Key parameters at a glance

A radius of 7.28 Earth radii
A mass of 41.80 Earth masses
Surface gravity around 0.79 g
An orbital period of 8.562 days
Semi-major axis 0.0770 AU
Equilibrium temperature 893 K (620 °C)
Distance from Earth 1,841.00 light-years
Earth Similarity Index 0.177
Travel time at Voyager 1 speed 32,466,044 years

K2-271 b Planet Profile

Physical Specs

Radius

7.28 R⊕

Radius (Jupiter)

0.649 R♃

Mass

41.80 M⊕

Mass (Jupiter)

0.131 M♃

Density

0.60 g/cm³

Surface Gravity

0.79 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.177

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

#187of 574

top 32.4%

This planet

7.28R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-2134 c 7.27 R⊕ TOI-7510 b 7.31 R⊕ TOI-1203 e 7.31 R⊕

Metric	Earth	K2-271 b	Jupiter
Radius (R⊕)	1.00	7.28	11.21
Mass (M⊕)	1.00	41.80	317.83
Density (g/cm³)	5.51	0.60	1.33
Surface Gravity (g)	1.00	0.79	2.53
Insolation (S⊕)	1.00	133.81	0.037

Star Catalogue Identifiers

TIC

TIC 60286662

Gaia DR2

Gaia DR2 655863775507590400

Gaia DR3

Gaia DR3 655863775507590400

System

K2-271

Percentile among Neptune-like cohort

Radius 7.280 R⊕ · percentile 67 / cohort 574

Mass 41.800 M⊕ · percentile 64 / cohort 574

Orbital period 8.56 d · percentile 33 / cohort 524

Distance 564.45 pc · percentile 59 / cohort 572

ESI 0.177 · percentile 22 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

8.562 days

Semi-major axis

0.0770 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 8.56 Earth days (2.3% of a terrestrial year) at a mean orbital distance of 0.0770 AU.

Transit Fingerprint

Depth

0.551 %

Duration

3.240 h

Impact parameter b

0.300

Rp / R★

0.067400

Transit midpoint (BJD)

2,457,149.7127

Photometric dip

Transit produces a flux drop of 5,513 ppm lasting ≈ 3.24 h.

Extended Orbital Architecture

Planet / star radius ratio

0.067400

Semi-major axis / stellar radius

20.690

Impact parameter (b)

0.300

Transit mid-time (BJD)

2,457,149.7127

Angular separation (arcsec)

0.13600

Eq. Temperature

893K

(620 °C)

Insolation (S⊕)

133.81

Earth = 1.00

Earth Similarity (ESI)

0.177

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Livingston et al. 2018

Instrument

Kepler CCD Array

Publication

2018-12

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: K2-271

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,644 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.990 R☉

Stellar Mass

0.830 M☉

Metallicity [Fe/H]

-0.30

Extended Stellar Properties

Surface gravity (log g)

4.370 dex

Stellar density

2.284 g/cm³

Metallicity ratio

[Fe/H]

Distance

564.45 parsec

Light-years 1,841.00 ly

V-band magnitude

13.85 mag

Voyager-speed travel 32,466,044 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

1.743 mas

Total Proper Motion

35.900 mas/yr

PM Right Ascension

9.74 mas/yr

PM Declination

-34.55 mas/yr

Galactic Cartesian (pc)

x = -0.554 · y = 0.785 · z = 0.277

Equatorial (J2000)

RA 125.22391° · Dec 16.09080°

Galactic ℓ, b

207.789° · 26.856°

Ecliptic λ, β

123.714° · -3.321°

HTM-20 index

-597643966