Key parameters at a glance

A radius of 2.55 Earth radii
A mass of 7.04 Earth masses
Surface gravity around 1.08 g
An orbital period of 26.820 days
Semi-major axis 0.1567 AU
Equilibrium temperature 507 K (234 °C)
Distance from Earth 487.49 light-years
Earth Similarity Index 0.487
Travel time at Voyager 1 speed 8,596,812 years

K2-241 b Planet Profile

Physical Specs

Radius

2.55 R⊕

Radius (Jupiter)

0.228 R♃

Mass

7.04 M⊕

Mass (Jupiter)

0.022 M♃

Density

2.33 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.487

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

#1105of 1978

top 55.8%

This planet

2.55R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-156 c 2.55 R⊕ Kepler-1535 b 2.55 R⊕ Kepler-1043 b 2.55 R⊕

Metric	Earth	K2-241 b	Jupiter
Radius (R⊕)	1.00	2.55	11.21
Mass (M⊕)	1.00	7.04	317.83
Density (g/cm³)	5.51	2.33	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 152805642

Gaia DR2

Gaia DR2 3594882751966012160

Gaia DR3

Gaia DR3 3594882751966012160

System

K2-241

Percentile among Sub-Neptune cohort

Radius 2.550 R⊕ · percentile 44 / cohort 1978

Mass 7.040 M⊕ · percentile 41 / cohort 1978

Orbital period 26.82 d · percentile 71 / cohort 1946

Distance 149.46 pc · percentile 25 / cohort 1975

ESI 0.487 · percentile 69 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

26.820 days

Semi-major axis

0.1567 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 26.82 Earth days (7.3% of a terrestrial year) at a mean orbital distance of 0.1567 AU.

Transit Fingerprint

Depth

0.090 %

Duration

4.100 h

Impact parameter b

0.410

Rp / R★

0.031200

Transit midpoint (BJD)

2,457,584.2063

Photometric dip

Transit produces a flux drop of 900 ppm lasting ≈ 4.10 h.

Extended Orbital Architecture

Planet / star radius ratio

0.031200

Semi-major axis / stellar radius

43.300

Impact parameter (b)

0.410

Transit mid-time (BJD)

2,457,584.2063

Angular separation (arcsec)

1.05000

Eq. Temperature

507K

(234 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.487

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

2018-08

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: K2-241

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,262 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.750 R☉

Stellar Mass

0.710 M☉

Metallicity [Fe/H]

-0.44

Extended Stellar Properties

Surface gravity (log g)

4.540 dex

Stellar density

3.110 g/cm³

Systemic radial velocity

-8.68 km/s

Rotational v·sin i

2.08 km/s

Metallicity ratio

[Fe/H]

Distance

149.46 parsec

Light-years 487.49 ly

V-band magnitude

11.97 mag

Voyager-speed travel 8,596,812 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

6.662 mas

Total Proper Motion

118.548 mas/yr

PM Right Ascension

-102.72 mas/yr

PM Declination

-59.18 mas/yr

Galactic Cartesian (pc)

x = -0.993 · y = -0.021 · z = -0.118

Equatorial (J2000)

RA 181.23868° · Dec -6.80530°

Galactic ℓ, b

282.912° · 54.250°

Ecliptic λ, β

183.847° · -5.750°

HTM-20 index

-1278773406