Key parameters at a glance

A radius of 0.93 Earth radii
A mass of 0.75 Earth masses
Surface gravity around 0.87 g
An orbital period of 6.913 days
Semi-major axis 0.0758 AU
Equilibrium temperature 1,209 K (936 °C)
Distance from Earth 2,555.11 light-years
Earth Similarity Index 0.257
Travel time at Voyager 1 speed 45,059,351 years

Kepler-1421 b Planet Profile

Physical Specs

Radius

0.93 R⊕

Radius (Jupiter)

0.083 R♃

Mass

0.75 M⊕

Mass (Jupiter)

0.002 M♃

Density

5.12 g/cm³

Surface Gravity

0.87 g (Earth)

Classification

Planet Type

Rocky Terrestrial

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

#391of 570

top 68.4%

This planet

0.93R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-398 b 0.93 R⊕ Kepler-1387 b 0.93 R⊕ Gliese 12 b 0.93 R⊕

Metric	Earth	Kepler-1421 b	Jupiter
Radius (R⊕)	1.00	0.93	11.21
Mass (M⊕)	1.00	0.75	317.83
Density (g/cm³)	5.51	5.12	1.33
Surface Gravity (g)	1.00	0.87	2.53
Insolation (S⊕)	1.00	649.15	0.037

Star Catalogue Identifiers

TIC

TIC 399826842

Gaia DR2

Gaia DR2 2131173187575866496

Gaia DR3

Gaia DR3 2131173187575866496

System

Kepler-1421

Percentile among Rocky Terrestrial cohort

Radius 0.930 R⊕ · percentile 31 / cohort 570

Mass 0.749 M⊕ · percentile 27 / cohort 570

Orbital period 6.91 d · percentile 67 / cohort 567

Distance 783.40 pc · percentile 84 / cohort 566

ESI 0.257 · percentile 27 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

6.913 days

Semi-major axis

0.0758 AU

Eccentricity

0.000

Inclination

88.60 °

Year Length

A year here lasts approximately 6.91 Earth days (1.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0758 AU.

Transit Fingerprint

Depth

0.004 %

Duration

4.768 h

Impact parameter b

0.264

Rp / R★

0.005685

Transit midpoint (BJD)

2,454,971.4240

Photometric dip

Transit produces a flux drop of 38 ppm lasting ≈ 4.77 h.

Extended Orbital Architecture

Planet / star radius ratio

0.005685

Semi-major axis / stellar radius

11.100

Impact parameter (b)

0.264

Transit mid-time (BJD)

2,454,971.4240

Angular separation (arcsec)

0.09670

Eq. Temperature

1,209K

(936 °C)

Insolation (S⊕)

649.15

Earth = 1.00

Earth Similarity (ESI)

0.257

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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-1421

Spectral Class

F-type yellow-white

Effective Temperature

6,335 K — hotter than the Sun (5,778 K)

Estimated Age

2.75 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.420 R☉

Stellar Mass

1.250 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.230 dex

Stellar density

0.270 g/cm³

Metallicity ratio

[Fe/H]

Distance

783.40 parsec

Light-years 2,555.11 ly

V-band magnitude

12.87 mag

Voyager-speed travel 45,059,351 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.248 mas

Total Proper Motion

11.997 mas/yr

PM Right Ascension

0.19 mas/yr

PM Declination

12.00 mas/yr

Galactic Cartesian (pc)

x = 0.189 · y = -0.635 · z = 0.749

Equatorial (J2000)

RA 286.58061° · Dec 48.54423°

Galactic ℓ, b

79.036° · 17.668°

Ecliptic λ, β

303.626° · 70.054°

HTM-20 index

-708382590