Key parameters at a glance

A radius of 2.71 Earth radii
A mass of 7.80 Earth masses
Surface gravity around 1.06 g
An orbital period of 9.957 days
Semi-major axis 0.0921 AU
Equilibrium temperature 946 K (673 °C)
Distance from Earth 4,449.49 light-years
Earth Similarity Index 0.257
Travel time at Voyager 1 speed 78,466,670 years

Kepler-1230 b Planet Profile

Physical Specs

Radius

2.71 R⊕

Radius (Jupiter)

0.242 R♃

Mass

7.80 M⊕

Mass (Jupiter)

0.025 M♃

Density

2.15 g/cm³

Surface Gravity

1.06 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.257

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

#849of 1978

top 42.9%

This planet

2.71R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-48 c 2.71 R⊕ Kepler-355 c 2.71 R⊕ Kepler-233 c 2.71 R⊕

Metric	Earth	Kepler-1230 b	Jupiter
Radius (R⊕)	1.00	2.71	11.21
Mass (M⊕)	1.00	7.80	317.83
Density (g/cm³)	5.51	2.15	1.33
Surface Gravity (g)	1.00	1.06	2.53
Insolation (S⊕)	1.00	153.93	0.037

Star Catalogue Identifiers

TIC

TIC 237157859

Gaia DR2

Gaia DR2 2104527554068149120

Gaia DR3

Gaia DR3 2104527554068149120

System

Kepler-1230

Percentile among Sub-Neptune cohort

Radius 2.710 R⊕ · percentile 57 / cohort 1978

Mass 7.800 M⊕ · percentile 52 / cohort 1978

Orbital period 9.96 d · percentile 34 / cohort 1946

Distance 1,364.22 pc · percentile 90 / cohort 1975

ESI 0.257 · percentile 18 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

9.957 days

Semi-major axis

0.0921 AU

Eccentricity

0.000

Inclination

83.62 °

Year Length

A year here lasts approximately 9.96 Earth days (2.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0921 AU.

Transit Fingerprint

Depth

0.059 %

Duration

2.870 h

Impact parameter b

0.960

Rp / R★

0.023443

Transit midpoint (BJD)

2,454,969.5903

Photometric dip

Transit produces a flux drop of 587 ppm lasting ≈ 2.87 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023443

Semi-major axis / stellar radius

6.800

Impact parameter (b)

0.960

Transit mid-time (BJD)

2,454,969.5903

Angular separation (arcsec)

0.06750

Eq. Temperature

946K

(673 °C)

Insolation (S⊕)

153.93

Earth = 1.00

Earth Similarity (ESI)

0.257

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

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-1230

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,961 K — hotter than the Sun (5,778 K)

Estimated Age

3.47 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.080 R☉

Stellar Mass

1.060 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.400 dex

Stellar density

3.201 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,364.22 parsec

Light-years 4,449.49 ly

V-band magnitude

15.63 mag

Voyager-speed travel 78,466,670 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.705 mas

Total Proper Motion

7.579 mas/yr

PM Right Ascension

-3.44 mas/yr

PM Declination

-6.75 mas/yr

Galactic Cartesian (pc)

x = 0.171 · y = -0.727 · z = 0.665

Equatorial (J2000)

RA 283.26451° · Dec 41.71145°

Galactic ℓ, b

71.470° · 17.380°

Ecliptic λ, β

293.076° · 64.092°

HTM-20 index

1372971243