Key parameters at a glance

A radius of 3.22 Earth radii
A mass of 10.50 Earth masses
Surface gravity around 1.01 g
An orbital period of 20.257 days
Semi-major axis 0.1627 AU
Distance from Earth 1,687.97 light-years
Earth Similarity Index 0.616
Travel time at Voyager 1 speed 29,767,317 years

1 sibling around K2-63

K2-63 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
K2-63 b this	Sub-Neptune	3.22	10.50	20.257	—	2016
K2-63 c	Sub-Neptune	3.90	14.50	25.456	—	2016

K2-63 b Planet Profile

Physical Specs

Radius

3.22 R⊕

Radius (Jupiter)

0.287 R♃

Mass

10.50 M⊕

Mass (Jupiter)

0.033 M♃

Density

1.73 g/cm³

Surface Gravity

1.01 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.616

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#332of 1978

top 16.7%

This planet

3.22R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-3493 b 3.22 R⊕ Kepler-648 b 3.22 R⊕ Kepler-472 b 3.22 R⊕

Metric	Earth	K2-63 b	Jupiter
Radius (R⊕)	1.00	3.22	11.21
Mass (M⊕)	1.00	10.50	317.83
Density (g/cm³)	5.51	1.73	1.33
Surface Gravity (g)	1.00	1.01	2.53
Insolation (S⊕)	1.00	188.00	0.037

Star Catalogue Identifiers

TIC

TIC 437699592

Gaia DR2

Gaia DR2 2612881429407251328

Gaia DR3

Gaia DR3 2612881429407251328

System

K2-63

Percentile among Sub-Neptune cohort

Radius 3.220 R⊕ · percentile 83 / cohort 1978

Mass 10.500 M⊕ · percentile 76 / cohort 1978

Orbital period 20.26 d · percentile 63 / cohort 1946

Distance 517.53 pc · percentile 48 / cohort 1975

ESI 0.616 · percentile 84 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

20.257 days

Semi-major axis

0.1627 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 20.26 Earth days (5.5% of a terrestrial year) at a mean orbital distance of 0.1627 AU.

Transit Fingerprint

Depth

0.048 %

Duration

5.490 h

Impact parameter b

0.240

Rp / R★

0.018000

Transit midpoint (BJD)

2,456,989.5929

Photometric dip

Transit produces a flux drop of 481 ppm lasting ≈ 5.49 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018000

Semi-major axis / stellar radius

26.600

Impact parameter (b)

0.240

Transit mid-time (BJD)

2,456,989.5929

Angular separation (arcsec)

0.31400

Eq. Temperature

—

Insolation (S⊕)

188.00

Earth = 1.00

Earth Similarity (ESI)

0.616

0 = alien, 1 = Earth-identical

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 K2-72 e · 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

Host System: K2-63

Spectral Class

F-type yellow-white

Effective Temperature

6,771 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.630 R☉

Stellar Mass

1.400 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.150 dex

Stellar density

0.713 g/cm³

Systemic radial velocity

-10.84 km/s

Distance

517.53 parsec

Light-years 1,687.97 ly

V-band magnitude

12.98 mag

Voyager-speed travel 29,767,317 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

1.907 mas

Total Proper Motion

23.490 mas/yr

PM Right Ascension

22.58 mas/yr

PM Declination

6.49 mas/yr

Galactic Cartesian (pc)

x = 0.875 · y = -0.437 · z = -0.209

Equatorial (J2000)

RA 333.42677° · Dec -12.06634°

Galactic ℓ, b

47.235° · -50.133°

Ecliptic λ, β

331.011° · -1.019°

HTM-20 index

641498199