Key parameters at a glance

A radius of 2.86 Earth radii
A mass of 8.55 Earth masses
Surface gravity around 1.05 g
An orbital period of 84.573 days
Semi-major axis 0.3778 AU
Equilibrium temperature 366 K (93 °C)
Distance from Earth 3,471.31 light-years
Earth Similarity Index 0.611
Travel time at Voyager 1 speed 61,216,565 years

Kepler-1237 b Planet Profile

Physical Specs

Radius

2.86 R⊕

Radius (Jupiter)

0.255 R♃

Mass

8.55 M⊕

Mass (Jupiter)

0.027 M♃

Density

2.01 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.611

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#671of 1978

top 33.9%

This planet

2.86R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-58 c 2.86 R⊕ Kepler-142 c 2.86 R⊕ Kepler-170 c 2.86 R⊕

Metric	Earth	Kepler-1237 b	Jupiter
Radius (R⊕)	1.00	2.86	11.21
Mass (M⊕)	1.00	8.55	317.83
Density (g/cm³)	5.51	2.01	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	4.04	0.037

Star Catalogue Identifiers

TIC

TIC 271770315

Gaia DR2

Gaia DR2 2079669589034384000

Gaia DR3

Gaia DR3 2079669589034384000

System

Kepler-1237

Percentile among Sub-Neptune cohort

Radius 2.860 R⊕ · percentile 66 / cohort 1978

Mass 8.550 M⊕ · percentile 60 / cohort 1978

Orbital period 84.57 d · percentile 92 / cohort 1946

Distance 1,064.31 pc · percentile 82 / cohort 1975

ESI 0.611 · percentile 83 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

84.573 days

Semi-major axis

0.3778 AU

Eccentricity

0.000

Inclination

89.99 °

Year Length

A year here lasts approximately 84.57 Earth days (23.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3778 AU.

Transit Fingerprint

Depth

0.089 %

Duration

5.715 h

Impact parameter b

0.156

Rp / R★

0.028914

Transit midpoint (BJD)

2,454,983.1533

Photometric dip

Transit produces a flux drop of 892 ppm lasting ≈ 5.72 h.

Extended Orbital Architecture

Planet / star radius ratio

0.028914

Semi-major axis / stellar radius

115.100

Impact parameter (b)

0.156

Transit mid-time (BJD)

2,454,983.1533

Angular separation (arcsec)

0.35500

Eq. Temperature

366K

(93 °C)

Insolation (S⊕)

4.04

Earth = 1.00

Earth Similarity (ESI)

0.611

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.

Discovery Paper

Primary reference

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-1237

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,472 K — cooler than the Sun (5,778 K)

Estimated Age

4.57 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.900 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

0.12

Extended Stellar Properties

Surface gravity (log g)

4.500 dex

Stellar density

4.020 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,064.31 parsec

Light-years 3,471.31 ly

V-band magnitude

16.01 mag

Voyager-speed travel 61,216,565 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.912 mas

Total Proper Motion

6.129 mas/yr

PM Right Ascension

-1.42 mas/yr

PM Declination

-5.96 mas/yr

Galactic Cartesian (pc)

x = 0.308 · y = -0.641 · z = 0.703

Equatorial (J2000)

RA 295.62927° · Dec 44.69058°

Galactic ℓ, b

78.106° · 10.418°

Ecliptic λ, β

314.919° · 64.185°

HTM-20 index

-1137683603