Key parameters at a glance

A radius of 2.80 Earth radii
A mass of 8.22 Earth masses
Surface gravity around 1.05 g
An orbital period of 35.866 days
Semi-major axis 0.2134 AU
Equilibrium temperature 633 K (360 °C)
Distance from Earth 2,606.01 light-years
Earth Similarity Index 0.382
Travel time at Voyager 1 speed 45,957,028 years

2 siblings around Kepler-529

Kepler-529 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-529 b	Super-Earth	1.86	4.12	1.980	1,662	2016
Kepler-529 c	Sub-Neptune	2.00	4.66	12.835	891	2016
Kepler-529 d this	Sub-Neptune	2.80	8.22	35.866	633	2021

Kepler-529 d Planet Profile

Physical Specs

Radius

2.80 R⊕

Radius (Jupiter)

0.249 R♃

Mass

8.22 M⊕

Mass (Jupiter)

0.026 M♃

Density

2.07 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.382

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#753of 1978

top 38.0%

This planet

2.80R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-206 b 2.80 R⊕ Kepler-1784 b 2.80 R⊕ Kepler-276 d 2.80 R⊕

Metric	Earth	Kepler-529 d	Jupiter
Radius (R⊕)	1.00	2.80	11.21
Mass (M⊕)	1.00	8.22	317.83
Density (g/cm³)	5.51	2.07	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	37.92	0.037

Star Catalogue Identifiers

TIC

TIC 158108219

Gaia DR2

Gaia DR2 2131505514964760832

Gaia DR3

Gaia DR3 2131505514964760832

System

Kepler-529

Percentile among Sub-Neptune cohort

Radius 2.795 R⊕ · percentile 62 / cohort 1978

Mass 8.220 M⊕ · percentile 57 / cohort 1978

Orbital period 35.87 d · percentile 78 / cohort 1946

Distance 799.01 pc · percentile 65 / cohort 1975

ESI 0.382 · percentile 49 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

35.866 days

Semi-major axis

0.2134 AU

Eccentricity

0.000

Inclination

85.14 °

Year Length

A year here lasts approximately 35.87 Earth days (9.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2134 AU.

Transit Fingerprint

Depth

0.025 %

Duration

7.216 h

Impact parameter b

0.717

Rp / R★

0.015610

Transit midpoint (BJD)

2,454,968.9464

Photometric dip

Transit produces a flux drop of 251 ppm lasting ≈ 7.22 h.

Extended Orbital Architecture

Planet / star radius ratio

0.015610

Semi-major axis / stellar radius

28.200

Impact parameter (b)

0.717

Transit mid-time (BJD)

2,454,968.9464

Angular separation (arcsec)

0.26700

Eq. Temperature

633K

(360 °C)

Insolation (S⊕)

37.92

Earth = 1.00

Earth Similarity (ESI)

0.382

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-529

Spectral Class

F-type yellow-white

Effective Temperature

6,078 K — hotter than the Sun (5,778 K)

Estimated Age

0.20 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.189 R☉

Stellar Mass

1.005 M☉

Metallicity [Fe/H]

-0.16

Extended Stellar Properties

Surface gravity (log g)

4.290 dex

Stellar density

0.022 g/cm³

Metallicity ratio

[Fe/H]

Distance

799.01 parsec

Light-years 2,606.01 ly

V-band magnitude

13.78 mag

Voyager-speed travel 45,957,028 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.552 mas

Total Proper Motion

6.371 mas/yr

PM Right Ascension

3.73 mas/yr

PM Declination

5.17 mas/yr

Galactic Cartesian (pc)

x = 0.184 · y = -0.645 · z = 0.742

Equatorial (J2000)

RA 285.88841° · Dec 47.88036°

Galactic ℓ, b

78.211° · 17.860°

Ecliptic λ, β

301.740° · 69.575°

HTM-20 index

-104798319