Key parameters at a glance

A radius of 3.90 Earth radii
A mass of 14.50 Earth masses
Surface gravity around 0.95 g
An orbital period of 25.456 days
Semi-major axis 0.1890 AU
Distance from Earth 1,687.97 light-years
Earth Similarity Index 0.552
Travel time at Voyager 1 speed 29,767,317 years

1 sibling around K2-63

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

K2-63 c Planet Profile

Physical Specs

Radius

3.90 R⊕

Radius (Jupiter)

0.348 R♃

Mass

14.50 M⊕

Mass (Jupiter)

0.046 M♃

Density

1.34 g/cm³

Surface Gravity

0.95 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.552

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

#23of 1978

top 1.1%

This planet

3.90R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-31 d 3.90 R⊕ K2-388 b 3.90 R⊕ Kepler-30 b 3.90 R⊕

Metric	Earth	K2-63 c	Jupiter
Radius (R⊕)	1.00	3.90	11.21
Mass (M⊕)	1.00	14.50	317.83
Density (g/cm³)	5.51	1.34	1.33
Surface Gravity (g)	1.00	0.95	2.53
Insolation (S⊕)	1.00	139.00	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 3.900 R⊕ · percentile 99 / cohort 1978

Mass 14.500 M⊕ · percentile 92 / cohort 1978

Orbital period 25.46 d · percentile 69 / cohort 1946

Distance 517.53 pc · percentile 48 / cohort 1975

ESI 0.552 · percentile 77 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

25.456 days

Semi-major axis

0.1890 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 25.46 Earth days (7.0% of a terrestrial year) at a mean orbital distance of 0.1890 AU.

Transit Fingerprint

Depth

0.079 %

Duration

4.240 h

Impact parameter b

0.350

Rp / R★

0.021900

Transit midpoint (BJD)

2,456,983.6454

Photometric dip

Transit produces a flux drop of 790 ppm lasting ≈ 4.24 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021900

Semi-major axis / stellar radius

36.500

Impact parameter (b)

0.350

Transit mid-time (BJD)

2,456,983.6454

Angular separation (arcsec)

0.36500

Eq. Temperature

—

Insolation (S⊕)

139.00

Earth = 1.00

Earth Similarity (ESI)

0.552

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