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 4.029 days
Semi-major axis 0.0510 AU
Equilibrium temperature 1,311 K (1038 °C)
Distance from Earth 2,039.58 light-years
Earth Similarity Index 0.229
Travel time at Voyager 1 speed 35,968,003 years

3 siblings around Kepler-402

Kepler-402 b shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-402 b this	Rocky Terrestrial	1.22	1.98	4.029	1,311	2014
Kepler-402 c	Super-Earth	1.56	3.05	6.125	1,140	2014
Kepler-402 d	Super-Earth	1.38	2.48	8.921	1,006	2014
Kepler-402 e	Super-Earth	1.46	2.73	11.243	931	2014

Kepler-402 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 0.229

HZ Position Inner

Controversial No

Discovery

Year 2014

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-402 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	619.84	0.037

Star Catalogue Identifiers

TIC

TIC 158725491

Gaia DR2

Gaia DR2 2102954187290293120

Gaia DR3

Gaia DR3 2102954187290293120

System

Kepler-402

Percentile among Rocky Terrestrial cohort

Radius 1.220 R⊕ · percentile 92 / cohort 570

Mass 1.980 M⊕ · percentile 83 / cohort 570

Orbital period 4.03 d · percentile 44 / cohort 567

Distance 625.34 pc · percentile 75 / cohort 566

ESI 0.229 · percentile 19 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

4.029 days

Semi-major axis

0.0510 AU

Eccentricity

0.000

Inclination

88.85 °

Year Length

A year here lasts approximately 4.03 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0510 AU.

Transit Fingerprint

Depth

0.010 %

Duration

2.985 h

Impact parameter b

0.060

Rp / R★

0.009529

Transit midpoint (BJD)

2,454,966.7690

Photometric dip

Transit produces a flux drop of 101 ppm lasting ≈ 2.99 h.

Extended Orbital Architecture

Planet / star radius ratio

0.009529

Semi-major axis / stellar radius

9.900

Impact parameter (b)

0.060

Transit mid-time (BJD)

2,454,966.7690

Angular separation (arcsec)

0.08160

Eq. Temperature

1,311K

(1038 °C)

Insolation (S⊕)

619.84

Earth = 1.00

Earth Similarity (ESI)

0.229

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Rowe et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-402

Spectral Class

F-type yellow-white

Effective Temperature

6,090 K — hotter than the Sun (5,778 K)

Estimated Age

1.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.264 R☉

Stellar Mass

1.072 M☉

Metallicity [Fe/H]

-0.08

Extended Stellar Properties

Surface gravity (log g)

4.278 dex

Stellar density

0.840 g/cm³

Systemic radial velocity

4.34 km/s

Metallicity ratio

[M/H]

Distance

625.34 parsec

Light-years 2,039.58 ly

V-band magnitude

13.27 mag

Voyager-speed travel 35,968,003 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.570 mas

Total Proper Motion

4.422 mas/yr

PM Right Ascension

-4.30 mas/yr

PM Declination

1.02 mas/yr

Galactic Cartesian (pc)

x = 0.229 · y = -0.690 · z = 0.687

Equatorial (J2000)

RA 288.37020° · Dec 43.35461°

Galactic ℓ, b

74.543° · 14.530°

Ecliptic λ, β

302.472° · 64.736°

HTM-20 index

246497150