Key parameters at a glance

A radius of 2.41 Earth radii
A mass of 6.39 Earth masses
Surface gravity around 1.10 g
An orbital period of 6.430 days
Semi-major axis 0.0653 AU
Equilibrium temperature 839 K (566 °C)
Distance from Earth 586.89 light-years
Earth Similarity Index 0.306
Travel time at Voyager 1 speed 10,349,891 years

2 siblings around K2-37

K2-37 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
K2-37 b	Super-Earth	1.39	2.51	4.443	949	2016
K2-37 c this	Sub-Neptune	2.41	6.39	6.430	839	2016
K2-37 d	Sub-Neptune	2.31	12.50	14.092	646	2016

K2-37 c Planet Profile

Physical Specs

Radius

2.41 R⊕

Radius (Jupiter)

0.215 R♃

Mass

6.39 M⊕

Mass (Jupiter)

0.020 M♃

Density

2.51 g/cm³

Surface Gravity

1.10 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.306

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

#1312of 1978

top 66.3%

This planet

2.41R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-143 b 2.41 R⊕ Kepler-343 b 2.41 R⊕ GJ 536 b 2.41 R⊕

Metric	Earth	K2-37 c	Jupiter
Radius (R⊕)	1.00	2.41	11.21
Mass (M⊕)	1.00	6.39	317.83
Density (g/cm³)	5.51	2.51	1.33
Surface Gravity (g)	1.00	1.10	2.53
Insolation (S⊕)	1.00	118.00	0.037

Star Catalogue Identifiers

TIC

TIC 68504570

Gaia DR2

Gaia DR2 6049595065740634624

Gaia DR3

Gaia DR3 6049595065740634624

System

K2-37

Percentile among Sub-Neptune cohort

Radius 2.410 R⊕ · percentile 33 / cohort 1978

Mass 6.390 M⊕ · percentile 31 / cohort 1978

Orbital period 6.43 d · percentile 20 / cohort 1946

Distance 179.94 pc · percentile 28 / cohort 1975

ESI 0.306 · percentile 30 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

6.430 days

Semi-major axis

0.0653 AU

Eccentricity

—

Inclination

88.16 °

Year Length

A year here lasts approximately 6.43 Earth days (1.8% of a terrestrial year) at a mean orbital distance of 0.0653 AU.

Transit Fingerprint

Depth

0.103 %

Duration

2.902 h

Impact parameter b

0.620

Rp / R★

0.027600

Transit midpoint (BJD)

2,456,898.8548

Photometric dip

Transit produces a flux drop of 1,027 ppm lasting ≈ 2.90 h.

Extended Orbital Architecture

Planet / star radius ratio

0.027600

Semi-major axis / stellar radius

15.100

Impact parameter (b)

0.620

Transit mid-time (BJD)

2,456,898.8548

Angular separation (arcsec)

0.36300

Eq. Temperature

839K

(566 °C)

Insolation (S⊕)

118.00

Earth = 1.00

Earth Similarity (ESI)

0.306

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

Sinukoff et al. 2016

Instrument

Kepler CCD Array

Publication

2016-08

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: K2-37

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,352 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.809 R☉

Stellar Mass

0.840 M☉

Metallicity [Fe/H]

-0.08

Extended Stellar Properties

Surface gravity (log g)

4.530 dex

Stellar density

1.806 g/cm³

Systemic radial velocity

-0.63 km/s

Rotational v·sin i

1.30 km/s

Activity index (log R'HK)

-4.957

Metallicity ratio

[Fe/H]

Distance

179.94 parsec

Light-years 586.89 ly

V-band magnitude

12.57 mag

Voyager-speed travel 10,349,891 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

5.529 mas

Total Proper Motion

11.345 mas/yr

PM Right Ascension

-11.07 mas/yr

PM Declination

2.46 mas/yr

Galactic Cartesian (pc)

x = -0.406 · y = -0.812 · z = -0.419

Equatorial (J2000)

RA 243.45097° · Dec -24.78705°

Galactic ℓ, b

350.737° · 18.771°

Ecliptic λ, β

246.007° · -3.532°

HTM-20 index

52634739