Key parameters at a glance

A radius of 2.07 Earth radii
A mass of 4.94 Earth masses
Surface gravity around 1.15 g
An orbital period of 6.530 days
Semi-major axis 0.0619 AU
Distance from Earth 1,630.42 light-years
Earth Similarity Index 0.773
Travel time at Voyager 1 speed 28,752,534 years

K2-64 b Planet Profile

Physical Specs

Radius

2.07 R⊕

Radius (Jupiter)

0.185 R♃

Mass

4.94 M⊕

Mass (Jupiter)

0.016 M♃

Density

3.06 g/cm³

Surface Gravity

1.15 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.773

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

#1860of 1978

top 94.0%

This planet

2.07R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-262 b 2.07 R⊕ Kepler-654 b 2.07 R⊕ Kepler-988 b 2.07 R⊕

Metric	Earth	K2-64 b	Jupiter
Radius (R⊕)	1.00	2.07	11.21
Mass (M⊕)	1.00	4.94	317.83
Density (g/cm³)	5.51	3.06	1.33
Surface Gravity (g)	1.00	1.15	2.53
Insolation (S⊕)	1.00	98.00	0.037

Star Catalogue Identifiers

TIC

TIC 38129680

Gaia DR2

Gaia DR2 2613822710144971776

Gaia DR3

Gaia DR3 2613822710144971776

System

K2-64

Percentile among Sub-Neptune cohort

Radius 2.070 R⊕ · percentile 6 / cohort 1978

Mass 4.940 M⊕ · percentile 7 / cohort 1978

Orbital period 6.53 d · percentile 20 / cohort 1946

Distance 499.89 pc · percentile 47 / cohort 1975

ESI 0.773 · percentile 99 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

6.530 days

Semi-major axis

0.0619 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 6.53 Earth days (1.8% of a terrestrial year) at a mean orbital distance of 0.0619 AU.

Transit Fingerprint

Depth

0.095 %

Duration

3.060 h

Impact parameter b

0.340

Rp / R★

0.025900

Transit midpoint (BJD)

2,456,986.1918

Photometric dip

Transit produces a flux drop of 950 ppm lasting ≈ 3.06 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025900

Semi-major axis / stellar radius

13.900

Impact parameter (b)

0.340

Transit mid-time (BJD)

2,456,986.1918

Angular separation (arcsec)

0.12400

Eq. Temperature

—

Insolation (S⊕)

98.00

Earth = 1.00

Earth Similarity (ESI)

0.773

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: K2-64

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,312 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.726 R☉

Stellar Mass

0.741 M☉

Metallicity [Fe/H]

—

Distance

499.89 parsec

Light-years 1,630.42 ly

V-band magnitude

14.13 mag

Voyager-speed travel 28,752,534 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

1.973 mas

Total Proper Motion

51.511 mas/yr

PM Right Ascension

49.58 mas/yr

PM Declination

13.99 mas/yr

Galactic Cartesian (pc)

x = 0.869 · y = -0.454 · z = -0.198

Equatorial (J2000)

RA 332.41385° · Dec -11.42867°

Galactic ℓ, b

47.376° · -48.958°

Ecliptic λ, β

330.309° · -0.071°

HTM-20 index

-754105149