Key parameters at a glance

A radius of 1.89 Earth radii
A mass of 4.23 Earth masses
Surface gravity around 1.18 g
An orbital period of 39.915 days
Semi-major axis 0.2114 AU
Equilibrium temperature 511 K (238 °C)
Distance from Earth 1,116.74 light-years
Earth Similarity Index 0.539
Travel time at Voyager 1 speed 19,693,684 years

K2-13 b Planet Profile

Physical Specs

Radius

1.89 R⊕

Radius (Jupiter)

0.169 R♃

Mass

4.23 M⊕

Mass (Jupiter)

0.013 M♃

Density

3.44 g/cm³

Surface Gravity

1.18 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.539

HZ Position Inner

Controversial No

Discovery

Year 2015

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#143of 1176

top 12.1%

This planet

1.89R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-371 b 1.89 R⊕ Kepler-1986 b 1.89 R⊕ Kepler-171 d 1.89 R⊕

Metric	Earth	K2-13 b	Jupiter
Radius (R⊕)	1.00	1.89	11.21
Mass (M⊕)	1.00	4.23	317.83
Density (g/cm³)	5.51	3.44	1.33
Surface Gravity (g)	1.00	1.18	2.53
Insolation (S⊕)	1.00	22.80	0.037

Star Catalogue Identifiers

TIC

TIC 363479723

Gaia DR2

Gaia DR2 3811032513054107648

Gaia DR3

Gaia DR3 3811032513054107648

System

K2-13

Percentile among Super-Earth cohort

Radius 1.890 R⊕ · percentile 87 / cohort 1176

Mass 4.230 M⊕ · percentile 80 / cohort 1176

Orbital period 39.91 d · percentile 95 / cohort 1164

Distance 342.39 pc · percentile 36 / cohort 1171

ESI 0.539 · percentile 76 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

39.915 days

Semi-major axis

0.2114 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 39.91 Earth days (10.9% of a terrestrial year) at a mean orbital distance of 0.2114 AU.

Transit Fingerprint

Depth

0.058 %

Duration

6.340 h

Impact parameter b

0.000

Rp / R★

0.022600

Transit midpoint (BJD)

2,456,812.5250

Photometric dip

Transit produces a flux drop of 580 ppm lasting ≈ 6.34 h.

Extended Orbital Architecture

Planet / star radius ratio

0.022600

Semi-major axis / stellar radius

79.690

Impact parameter (b)

0.000

Transit mid-time (BJD)

2,456,812.5250

Angular separation (arcsec)

0.61700

Eq. Temperature

511K

(238 °C)

Insolation (S⊕)

22.80

Earth = 1.00

Earth Similarity (ESI)

0.539

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Montet et al. 2015

Instrument

Kepler CCD Array

Publication

2015-08

Observation locale

Space

Discovery cohort

Planets confirmed in 2015 at K2 (12 shown).

K2-18 b · Sub-Neptune K2-9 b · Sub-Neptune K2-3 d · Super-Earth K2-3 c · Super-Earth K2-21 c · Sub-Neptune K2-5 c · Sub-Neptune K2-3 b · Sub-Neptune K2-17 b · Sub-Neptune K2-21 b · Super-Earth K2-16 c · Sub-Neptune K2-5 b · Super-Earth K2-25 b · Sub-Neptune

Host System: K2-13

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,698 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.780 R☉

Stellar Mass

0.800 M☉

Metallicity [Fe/H]

-0.54

Extended Stellar Properties

Surface gravity (log g)

4.330 dex

Stellar density

1.720 g/cm³

Systemic radial velocity

15.45 km/s

Metallicity ratio

[Fe/H]

Distance

342.39 parsec

Light-years 1,116.74 ly

V-band magnitude

12.88 mag

Voyager-speed travel 19,693,684 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

2.892 mas

Total Proper Motion

18.277 mas/yr

PM Right Ascension

-11.75 mas/yr

PM Declination

14.00 mas/yr

Galactic Cartesian (pc)

x = -0.984 · y = 0.171 · z = 0.044

Equatorial (J2000)

RA 170.15548° · Dec 2.50275°

Galactic ℓ, b

257.617° · 57.156°

Ecliptic λ, β

169.967° · -1.598°

HTM-20 index

394695401