Key parameters at a glance

A radius of 1.06 Earth radii
A mass of 1.20 Earth masses
Surface gravity around 1.07 g
An orbital period of 23.955 days
Semi-major axis 0.1586 AU
Equilibrium temperature 741 K (468 °C)
Distance from Earth 1,464.44 light-years
Earth Similarity Index 0.440
Travel time at Voyager 1 speed 25,825,406 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1423 b Planet Profile

Physical Specs

Radius

1.06 R⊕

Radius (Jupiter)

0.095 R♃

Mass

1.20 M⊕

Mass (Jupiter)

0.004 M♃

Density

5.54 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.440

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

#270of 570

top 47.2%

This planet

1.06R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1200 b 1.06 R⊕ Kepler-316 b 1.06 R⊕ Kepler-1203 b 1.06 R⊕

Metric	Earth	Kepler-1423 b	Jupiter
Radius (R⊕)	1.00	1.06	11.21
Mass (M⊕)	1.00	1.20	317.83
Density (g/cm³)	5.51	5.54	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	71.16	0.037

Star Catalogue Identifiers

TIC

TIC 121599740

Gaia DR2

Gaia DR2 2102161989163432832

Gaia DR3

Gaia DR3 2102161989163432832

System

Kepler-1423

Percentile among Rocky Terrestrial cohort

Radius 1.060 R⊕ · percentile 51 / cohort 570

Mass 1.200 M⊕ · percentile 46 / cohort 570

Orbital period 23.96 d · percentile 94 / cohort 567

Distance 449.00 pc · percentile 58 / cohort 566

ESI 0.440 · percentile 64 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

23.955 days

Semi-major axis

0.1586 AU

Eccentricity

0.000

Inclination

89.12 °

Year Length

A year here lasts approximately 23.96 Earth days (6.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1586 AU.

Transit Fingerprint

Depth

0.023 %

Duration

3.185 h

Impact parameter b

0.047

Rp / R★

0.013471

Transit midpoint (BJD)

2,454,979.6636

Photometric dip

Transit produces a flux drop of 229 ppm lasting ≈ 3.19 h.

Extended Orbital Architecture

Planet / star radius ratio

0.013471

Semi-major axis / stellar radius

58.180

Impact parameter (b)

0.047

Transit mid-time (BJD)

2,454,979.6636

Angular separation (arcsec)

0.35300

Eq. Temperature

741K

(468 °C)

Insolation (S⊕)

71.16

Earth = 1.00

Earth Similarity (ESI)

0.440

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-1423

Spectral Class

K-type orange

Effective Temperature

4,939 K — cooler than the Sun (5,778 K)

Estimated Age

4.68 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.750 R☉

Stellar Mass

0.790 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.590 dex

Stellar density

6.491 g/cm³

Metallicity ratio

[Fe/H]

Distance

449.00 parsec

Light-years 1,464.44 ly

V-band magnitude

14.72 mag

Voyager-speed travel 25,825,406 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Total Proper Motion

6.808 mas/yr

PM Right Ascension

-6.41 mas/yr

PM Declination

-2.30 mas/yr

Galactic Cartesian (pc)

x = 0.236 · y = -0.716 · z = 0.658

Equatorial (J2000)

RA 288.24375° · Dec 41.11007°

Galactic ℓ, b

72.389° · 13.703°

Ecliptic λ, β

300.841° · 62.609°

HTM-20 index

-1095233680