Key parameters at a glance

A radius of 1.22 Earth radii
A mass of 1.98 Earth masses
Surface gravity around 1.33 g
An orbital period of 16.301 days
Semi-major axis 0.1186 AU
Equilibrium temperature 557 K (284 °C)
Distance from Earth 1,500.18 light-years
Earth Similarity Index 0.558
Travel time at Voyager 1 speed 26,455,626 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1223 b Planet Profile

Physical Specs

Radius

1.22 R⊕

Radius (Jupiter)

0.109 R♃

Mass

1.98 M⊕

Mass (Jupiter)

0.006 M♃

Density

5.99 g/cm³

Surface Gravity

1.33 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.558

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

#35of 570

top 6.0%

This planet

1.22R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-295 b 1.22 R⊕ Kepler-226 d 1.22 R⊕ Kepler-197 d 1.22 R⊕

Metric	Earth	Kepler-1223 b	Jupiter
Radius (R⊕)	1.00	1.22	11.21
Mass (M⊕)	1.00	1.98	317.83
Density (g/cm³)	5.51	5.99	1.33
Surface Gravity (g)	1.00	1.33	2.53
Insolation (S⊕)	1.00	20.51	0.037

Star Catalogue Identifiers

TIC

TIC 164889945

Gaia DR2

Gaia DR2 2105969082532659328

Gaia DR3

Gaia DR3 2105969082532659328

System

Kepler-1223

Percentile among Rocky Terrestrial cohort

Radius 1.220 R⊕ · percentile 92 / cohort 570

Mass 1.980 M⊕ · percentile 83 / cohort 570

Orbital period 16.30 d · percentile 90 / cohort 567

Distance 459.96 pc · percentile 59 / cohort 566

ESI 0.558 · percentile 74 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

16.301 days

Semi-major axis

0.1186 AU

Eccentricity

0.000

Inclination

86.86 °

Year Length

A year here lasts approximately 16.30 Earth days (4.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1186 AU.

Transit Fingerprint

Depth

0.028 %

Duration

3.984 h

Impact parameter b

0.378

Rp / R★

0.015068

Transit midpoint (BJD)

2,454,966.7924

Photometric dip

Transit produces a flux drop of 279 ppm lasting ≈ 3.98 h.

Extended Orbital Architecture

Planet / star radius ratio

0.015068

Semi-major axis / stellar radius

16.040

Impact parameter (b)

0.378

Transit mid-time (BJD)

2,454,966.7924

Angular separation (arcsec)

0.25800

Eq. Temperature

557K

(284 °C)

Insolation (S⊕)

20.51

Earth = 1.00

Earth Similarity (ESI)

0.558

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

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-1223

Spectral Class

K-type orange

Effective Temperature

4,870 K — cooler than the Sun (5,778 K)

Estimated Age

3.63 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.750 R☉

Stellar Mass

0.800 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

4.600 dex

Stellar density

1.819 g/cm³

Metallicity ratio

[Fe/H]

Distance

459.96 parsec

Light-years 1,500.18 ly

V-band magnitude

14.91 mag

Voyager-speed travel 26,455,626 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.145 mas

Total Proper Motion

17.183 mas/yr

PM Right Ascension

-15.84 mas/yr

PM Declination

6.65 mas/yr

Galactic Cartesian (pc)

x = 0.188 · y = -0.687 · z = 0.702

Equatorial (J2000)

RA 285.29565° · Dec 44.55275°

Galactic ℓ, b

74.805° · 17.034°

Ecliptic λ, β

298.129° · 66.504°

HTM-20 index

71371953