Key parameters at a glance

A radius of 4.77 Earth radii
A mass of 20.40 Earth masses
Surface gravity around 0.90 g
An orbital period of 4.287 days
Semi-major axis 0.0535 AU
Equilibrium temperature 1,217 K (944 °C)
Distance from Earth 5,189.27 light-years
Earth Similarity Index 0.153
Travel time at Voyager 1 speed 91,512,814 years

Kepler-502 b Planet Profile

Physical Specs

Radius

4.77 R⊕

Radius (Jupiter)

0.426 R♃

Mass

20.40 M⊕

Mass (Jupiter)

0.064 M♃

Density

1.03 g/cm³

Surface Gravity

0.90 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.153

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

#415of 574

top 72.1%

This planet

4.77R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-1527 b 4.77 R⊕ HD 153557 b 4.77 R⊕ HD 144899 b 4.77 R⊕

Metric	Earth	Kepler-502 b	Jupiter
Radius (R⊕)	1.00	4.77	11.21
Mass (M⊕)	1.00	20.40	317.83
Density (g/cm³)	5.51	1.03	1.33
Surface Gravity (g)	1.00	0.90	2.53
Insolation (S⊕)	1.00	859.51	0.037

Star Catalogue Identifiers

TIC

TIC 159578156

Gaia DR2

Gaia DR2 2126099078855696256

Gaia DR3

Gaia DR3 2126099078855696256

System

Kepler-502

Percentile among Neptune-like cohort

Radius 4.770 R⊕ · percentile 27 / cohort 574

Mass 20.400 M⊕ · percentile 31 / cohort 574

Orbital period 4.29 d · percentile 15 / cohort 524

Distance 1,591.04 pc · percentile 85 / cohort 572

ESI 0.153 · percentile 15 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

4.287 days

Semi-major axis

0.0535 AU

Eccentricity

0.000

Inclination

81.72 °

Year Length

A year here lasts approximately 4.29 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0535 AU.

Transit Fingerprint

Depth

0.132 %

Duration

4.423 h

Impact parameter b

0.830

Rp / R★

0.036136

Transit midpoint (BJD)

2,454,971.6155

Photometric dip

Transit produces a flux drop of 1,322 ppm lasting ≈ 4.42 h.

Extended Orbital Architecture

Planet / star radius ratio

0.036136

Semi-major axis / stellar radius

4.479

Impact parameter (b)

0.830

Transit mid-time (BJD)

2,454,971.6155

Angular separation (arcsec)

0.03360

Eq. Temperature

1,217K

(944 °C)

Insolation (S⊕)

859.51

Earth = 1.00

Earth Similarity (ESI)

0.153

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-502

Spectral Class

F-type yellow-white

Effective Temperature

6,125 K — hotter than the Sun (5,778 K)

Estimated Age

3.09 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.220 R☉

Stellar Mass

1.150 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.330 dex

Stellar density

0.211 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,591.04 parsec

Light-years 5,189.27 ly

V-band magnitude

15.14 mag

Voyager-speed travel 91,512,814 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.600 mas

Total Proper Motion

1.284 mas/yr

PM Right Ascension

-0.53 mas/yr

PM Declination

-1.17 mas/yr

Galactic Cartesian (pc)

x = 0.259 · y = -0.673 · z = 0.693

Equatorial (J2000)

RA 291.08013° · Dec 43.86019°

Galactic ℓ, b

75.855° · 12.956°

Ecliptic λ, β

307.198° · 64.601°

HTM-20 index

746532072