Key parameters at a glance

A radius of 1.29 Earth radii
A mass of 2.21 Earth masses
Surface gravity around 1.33 g
An orbital period of 24.159 days
Semi-major axis 0.1060 AU
Distance from Earth 216.67 light-years
Earth Similarity Index 0.938
Travel time at Voyager 1 speed 3,821,015 years
Almost certainly tidally locked to its host star given the close orbit

Context from the literature

K2-72e (also known by its EPIC designation EPIC 206209135.04), is a confirmed exoplanet, likely rocky, orbiting within the habitable zone of the red dwarf star K2-72, the outermost of four such planets discovered in the system by NASA's Kepler spacecraft on its "Second Light" mission. It is located about 217.1 light-years (66.56 parsecs, or nearly 2.0538×1015 km) away from Earth in the constellation of Aquarius. The exoplanet was found by using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured.

Excerpted from Wikipedia · full article

3 siblings around K2-72

K2-72 e shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
K2-72 b	Rocky Terrestrial	1.08	1.28	5.577	—	2016
K2-72 d	Rocky Terrestrial	1.01	1.01	7.760	—	2016
K2-72 c	Rocky Terrestrial	1.16	1.65	15.189	—	2016
K2-72 e this	Super-Earth	1.29	2.21	24.159	—	2016

K2-72 e Planet Profile

Physical Specs

Radius

1.29 R⊕

Radius (Jupiter)

0.115 R♃

Mass

2.21 M⊕

Mass (Jupiter)

0.007 M♃

Density

5.66 g/cm³

Surface Gravity

1.33 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.938

HZ Position Habitable

Controversial No

Discovery

Year 2016

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1100of 1176

top 93.5%

This planet

1.29R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-211 c 1.29 R⊕ Kepler-312 b 1.29 R⊕ Kepler-173 b 1.29 R⊕

Metric	Earth	K2-72 e	Jupiter
Radius (R⊕)	1.00	1.29	11.21
Mass (M⊕)	1.00	2.21	317.83
Density (g/cm³)	5.51	5.66	1.33
Surface Gravity (g)	1.00	1.33	2.53
Insolation (S⊕)	1.00	1.20	0.037

Star Catalogue Identifiers

TIC

TIC 38337202

Gaia DR2

Gaia DR2 2615653023342995584

Gaia DR3

Gaia DR3 2615653023342995584

System

K2-72

Percentile among Super-Earth cohort

Radius 1.290 R⊕ · percentile 6 / cohort 1176

Mass 2.210 M⊕ · percentile 6 / cohort 1176

Orbital period 24.16 d · percentile 88 / cohort 1164

Distance 66.43 pc · percentile 13 / cohort 1171

ESI 0.938 · percentile 99 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

24.159 days

Semi-major axis

0.1060 AU

Eccentricity

0.110

Inclination

89.68 °

Year Length

A year here lasts approximately 24.16 Earth days (6.6% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1060 AU.

Transit Fingerprint

Duration

2.250 h

Rp / R★

0.035758

Transit midpoint (BJD)

2,456,987.0540

Extended Orbital Architecture

Planet / star radius ratio

0.035758

Semi-major axis / stellar radius

64.530

Transit mid-time (BJD)

2,456,987.0540

Long. of periastron (ω)

11.39°

Angular separation (arcsec)

1.60000

Eq. Temperature

—

Insolation (S⊕)

1.20

Earth = 1.00

Earth Similarity (ESI)

0.938

0 = alien, 1 = Earth-identical

Within the conservative habitable zone. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Crossfield et al. 2016

Instrument

Kepler CCD Array

Publication

2016-09

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at K2 (12 shown).

K2-72 d · Rocky Terrestrial K2-72 b · Rocky Terrestrial K2-91 b · Rocky Terrestrial K2-72 c · Rocky Terrestrial K2-102 b · Super-Earth K2-90 c · Super-Earth K2-83 b · Rocky Terrestrial K2-88 b · Rocky Terrestrial K2-80 c · Super-Earth K2-83 c · Super-Earth K2-65 b · Super-Earth K2-68 b · Super-Earth

Host System: K2-72

Spectral Class

M-type red dwarf

Effective Temperature

3,360 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.331 R☉

Stellar Mass

0.271 M☉

Metallicity [Fe/H]

—

Distance

66.43 parsec

Light-years 216.67 ly

V-band magnitude

15.37 mag

Voyager-speed travel 3,821,015 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

15.024 mas

Total Proper Motion

209.489 mas/yr

PM Right Ascension

195.86 mas/yr

PM Declination

74.34 mas/yr

Galactic Cartesian (pc)

x = 0.891 · y = -0.423 · z = -0.167

Equatorial (J2000)

RA 334.62275° · Dec -9.61201°

Galactic ℓ, b

51.461° · -49.940°

Ecliptic λ, β

332.985° · 0.853°

HTM-20 index

833098984

Wikipedia → Image: Wikimedia Commons · Helgo13 · CC BY-SA 4.0