Key parameters at a glance

A radius of 2.50 Earth radii
A mass of 6.80 Earth masses
Surface gravity around 1.09 g
An orbital period of 4.170 days
Semi-major axis 0.0499 AU
Equilibrium temperature 1,057 K (784 °C)
Distance from Earth 1,618.68 light-years
Earth Similarity Index 0.235
Travel time at Voyager 1 speed 28,545,356 years

1 sibling around K2-282

K2-282 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
EPIC 220554210 c	Super-Earth	1.60	3.19	0.705	—	2019
K2-282 b this	Sub-Neptune	2.50	6.80	4.170	1,057	2018

K2-282 b Planet Profile

Physical Specs

Radius

2.50 R⊕

Radius (Jupiter)

0.223 R♃

Mass

6.80 M⊕

Mass (Jupiter)

0.021 M♃

Density

2.39 g/cm³

Surface Gravity

1.09 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.235

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

#1168of 1978

top 59.0%

This planet

2.50R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-126 d 2.50 R⊕ Kepler-254 d 2.50 R⊕ GJ 163 c 2.50 R⊕

Metric	Earth	K2-282 b	Jupiter
Radius (R⊕)	1.00	2.50	11.21
Mass (M⊕)	1.00	6.80	317.83
Density (g/cm³)	5.51	2.39	1.33
Surface Gravity (g)	1.00	1.09	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 266030192

Gaia DR2

Gaia DR2 2580848395082660992

Gaia DR3

Gaia DR3 2580848395082660992

System

K2-282

Percentile among Sub-Neptune cohort

Radius 2.500 R⊕ · percentile 40 / cohort 1978

Mass 6.800 M⊕ · percentile 37 / cohort 1978

Orbital period 4.17 d · percentile 9 / cohort 1946

Distance 496.29 pc · percentile 47 / cohort 1975

ESI 0.235 · percentile 13 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

4.170 days

Semi-major axis

0.0499 AU

Eccentricity

—

Inclination

90.10 °

Year Length

A year here lasts approximately 4.17 Earth days (1.1% of a terrestrial year) at a mean orbital distance of 0.0499 AU.

Transit Fingerprint

Depth

0.094 %

Duration

2.731 h

Impact parameter b

0.400

Rp / R★

0.022700

Transit midpoint (BJD)

2,457,457.5449

Photometric dip

Transit produces a flux drop of 935 ppm lasting ≈ 2.73 h.

Extended Orbital Architecture

Planet / star radius ratio

0.022700

Semi-major axis / stellar radius

11.000

Impact parameter (b)

0.400

Transit mid-time (BJD)

2,457,457.5449

Angular separation (arcsec)

0.10100

Eq. Temperature

1,057K

(784 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.235

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

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: K2-282

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,499 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.000 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

-0.23

Extended Stellar Properties

Surface gravity (log g)

4.500 dex

Stellar density

1.442 g/cm³

Metallicity ratio

[Fe/H]

Distance

496.29 parsec

Light-years 1,618.68 ly

V-band magnitude

14.21 mag

Voyager-speed travel 28,545,356 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

1.986 mas

Total Proper Motion

32.432 mas/yr

PM Right Ascension

31.90 mas/yr

PM Declination

-5.85 mas/yr

Galactic Cartesian (pc)

x = 0.963 · y = 0.230 · z = 0.139

Equatorial (J2000)

RA 13.43215° · Dec 7.99529°

Galactic ℓ, b

123.918° · -54.872°

Ecliptic λ, β

15.456° · 2.069°

HTM-20 index

-222019865