Key parameters at a glance

A radius of 3.13 Earth radii
A mass of 9.96 Earth masses
Surface gravity around 1.02 g
An orbital period of 14.454 days
Semi-major axis 0.1007 AU
Equilibrium temperature 747 K (474 °C)
Distance from Earth 1,379.85 light-years
Earth Similarity Index 0.310
Travel time at Voyager 1 speed 24,333,687 years

K2-272 b Planet Profile

Physical Specs

Radius

3.13 R⊕

Radius (Jupiter)

0.279 R♃

Mass

9.96 M⊕

Mass (Jupiter)

0.031 M♃

Density

1.78 g/cm³

Surface Gravity

1.02 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.310

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

#406of 1978

top 20.5%

This planet

3.13R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1546 b 3.13 R⊕ Kepler-104 c 3.13 R⊕ Kepler-146 c 3.13 R⊕

Metric	Earth	K2-272 b	Jupiter
Radius (R⊕)	1.00	3.13	11.21
Mass (M⊕)	1.00	9.96	317.83
Density (g/cm³)	5.51	1.78	1.33
Surface Gravity (g)	1.00	1.02	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 46259692

Gaia DR2

Gaia DR2 659826037455527040

Gaia DR3

Gaia DR3 659826037455527040

System

K2-272

Percentile among Sub-Neptune cohort

Radius 3.130 R⊕ · percentile 79 / cohort 1978

Mass 9.960 M⊕ · percentile 72 / cohort 1978

Orbital period 14.45 d · percentile 49 / cohort 1946

Distance 423.07 pc · percentile 43 / cohort 1975

ESI 0.310 · percentile 31 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

14.454 days

Semi-major axis

0.1007 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 14.45 Earth days (4.0% of a terrestrial year) at a mean orbital distance of 0.1007 AU.

Transit Fingerprint

Depth

0.123 %

Duration

3.220 h

Impact parameter b

0.580

Rp / R★

0.034300

Transit midpoint (BJD)

2,457,144.8541

Photometric dip

Transit produces a flux drop of 1,225 ppm lasting ≈ 3.22 h.

Extended Orbital Architecture

Planet / star radius ratio

0.034300

Semi-major axis / stellar radius

26.160

Impact parameter (b)

0.580

Transit mid-time (BJD)

2,457,144.8541

Angular separation (arcsec)

0.23800

Eq. Temperature

747K

(474 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.310

0 = alien, 1 = Earth-identical

Insufficient insolation data — 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: K2-272

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,397 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.830 R☉

Stellar Mass

0.860 M☉

Metallicity [Fe/H]

-0.09

Extended Stellar Properties

Surface gravity (log g)

4.530 dex

Stellar density

2.577 g/cm³

Metallicity ratio

[Fe/H]

Distance

423.07 parsec

Light-years 1,379.85 ly

V-band magnitude

13.87 mag

Voyager-speed travel 24,333,687 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

2.335 mas

Total Proper Motion

17.463 mas/yr

PM Right Ascension

12.02 mas/yr

PM Declination

-12.67 mas/yr

Galactic Cartesian (pc)

x = -0.646 · y = 0.702 · z = 0.301

Equatorial (J2000)

RA 132.62117° · Dec 17.54239°

Galactic ℓ, b

209.307° · 33.964°

Ecliptic λ, β

130.211° · -0.146°

HTM-20 index

-1111620642