Key parameters at a glance

A radius of 2.89 Earth radii
A mass of 8.70 Earth masses
Surface gravity around 1.04 g
An orbital period of 13.979 days
Semi-major axis 0.1112 AU
Distance from Earth 759.83 light-years
Earth Similarity Index 0.653
Travel time at Voyager 1 speed 13,399,532 years

K2-70 b Planet Profile

Physical Specs

Radius

2.89 R⊕

Radius (Jupiter)

0.258 R♃

Mass

8.70 M⊕

Mass (Jupiter)

0.027 M♃

Density

1.98 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.653

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

#640of 1978

top 32.3%

This planet

2.89R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-781 b 2.89 R⊕ Kepler-689 b 2.89 R⊕ Kepler-53 b 2.89 R⊕

Metric	Earth	K2-70 b	Jupiter
Radius (R⊕)	1.00	2.89	11.21
Mass (M⊕)	1.00	8.70	317.83
Density (g/cm³)	5.51	1.98	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	62.00	0.037

Star Catalogue Identifiers

TIC

TIC 250979498

Gaia DR2

Gaia DR2 2608811445383136768

Gaia DR3

Gaia DR3 2608811445383136768

System

K2-70

Percentile among Sub-Neptune cohort

Radius 2.890 R⊕ · percentile 67 / cohort 1978

Mass 8.700 M⊕ · percentile 61 / cohort 1978

Orbital period 13.98 d · percentile 48 / cohort 1946

Distance 232.96 pc · percentile 31 / cohort 1975

ESI 0.653 · percentile 88 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

13.979 days

Semi-major axis

0.1112 AU

Eccentricity

—

Inclination

89.15 °

Year Length

A year here lasts approximately 13.98 Earth days (3.8% of a terrestrial year) at a mean orbital distance of 0.1112 AU.

Transit Fingerprint

Depth

0.108 %

Duration

3.520 h

Impact parameter b

0.260

Rp / R★

0.028100

Transit midpoint (BJD)

2,456,984.4435

Photometric dip

Transit produces a flux drop of 1,076 ppm lasting ≈ 3.52 h.

Extended Orbital Architecture

Planet / star radius ratio

0.028100

Semi-major axis / stellar radius

29.575

Impact parameter (b)

0.260

Transit mid-time (BJD)

2,456,984.4435

Angular separation (arcsec)

0.47700

Eq. Temperature

—

Insolation (S⊕)

62.00

Earth = 1.00

Earth Similarity (ESI)

0.653

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: K2-70

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,622 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.930 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.478 dex

Stellar density

2.396 g/cm³

Metallicity ratio

[Fe/H]

Distance

232.96 parsec

Light-years 759.83 ly

V-band magnitude

13.07 mag

Voyager-speed travel 13,399,532 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

4.265 mas

Total Proper Motion

33.795 mas/yr

PM Right Ascension

31.53 mas/yr

PM Declination

-12.16 mas/yr

Galactic Cartesian (pc)

x = 0.916 · y = -0.361 · z = -0.175

Equatorial (J2000)

RA 338.47593° · Dec -10.08499°

Galactic ℓ, b

54.042° · -53.416°

Ecliptic λ, β

336.347° · -0.973°

HTM-20 index

-173953188