Key parameters at a glance

A radius of 2.35 Earth radii
A mass of 11.14 Earth masses
Surface gravity around 2.02 g
An orbital period of 8.140 days
Semi-major axis 0.0805 AU
Equilibrium temperature 1,050 K (777 °C)
Distance from Earth 3,773.01 light-years
Earth Similarity Index 0.259
Travel time at Voyager 1 speed 66,536,943 years

3 siblings around Kepler-24

Kepler-24 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-24 d	Super-Earth	1.67	293.96	4.244	1,305	2014
Kepler-24 b this	Sub-Neptune	2.35	11.14	8.140	1,050	2011
Kepler-24 c	Sub-Neptune	2.51	9.99	12.330	915	2011
Kepler-24 e	Sub-Neptune	2.78	26.21	18.998	792	2014

Kepler-24 b Planet Profile

Physical Specs

Radius

2.35 R⊕

Radius (Jupiter)

0.209 R♃

Mass

11.14 M⊕

Mass (Jupiter)

0.035 M♃

Density

4.69 g/cm³

Surface Gravity

2.02 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.259

HZ Position Inner

Controversial No

Discovery

Year 2011

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1427of 1978

top 72.1%

This planet

2.35R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-4342 c 2.35 R⊕ Kepler-306 c 2.35 R⊕ Kepler-216 b 2.35 R⊕

Metric	Earth	Kepler-24 b	Jupiter
Radius (R⊕)	1.00	2.35	11.21
Mass (M⊕)	1.00	11.14	317.83
Density (g/cm³)	5.51	4.69	1.33
Surface Gravity (g)	1.00	2.02	2.53
Insolation (S⊕)	1.00	252.25	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	11.140 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 122376177

Gaia DR2

Gaia DR2 2052823535171095296

Gaia DR3

Gaia DR3 2052823535171095296

System

Kepler-24

Percentile among Sub-Neptune cohort

Radius 2.348 R⊕ · percentile 28 / cohort 1978

Mass 11.140 M⊕ · percentile 81 / cohort 1978

Orbital period 8.14 d · percentile 27 / cohort 1946

Distance 1,156.81 pc · percentile 85 / cohort 1975

ESI 0.259 · percentile 18 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

8.140 days

Semi-major axis

0.0805 AU

Eccentricity

0.023

Inclination

77.26 °

Year Length

A year here lasts approximately 8.14 Earth days (2.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0804 AU.

Transit Fingerprint

Depth

0.050 %

Duration

4.776 h

Impact parameter b

0.113

Rp / R★

0.020711

Transit midpoint (BJD)

2,454,973.5691

Photometric dip

Transit produces a flux drop of 497 ppm lasting ≈ 4.78 h.

Extended Orbital Architecture

Planet / star radius ratio

0.020711

Semi-major axis / stellar radius

16.827

Impact parameter (b)

0.113

Transit mid-time (BJD)

2,454,973.5691

Angular separation (arcsec)

0.06950

Eq. Temperature

1,050K

(777 °C)

Insolation (S⊕)

252.25

Earth = 1.00

Earth Similarity (ESI)

0.259

0 = alien, 1 = Earth-identical

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

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Ford et al. 2012

Instrument

Kepler CCD Array

Publication

2012-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2011 at Kepler (12 shown).

Kepler-22 b · Sub-Neptune Kepler-20 d · Sub-Neptune Kepler-26 c · Sub-Neptune Kepler-19 c · Sub-Neptune Kepler-26 b · Sub-Neptune Kepler-28 c · Super-Earth Kepler-10 c · Sub-Neptune Kepler-20 f · Rocky Terrestrial Kepler-42 d · Rocky Terrestrial Kepler-16 b · Neptune-like Kepler-28 b · Super-Earth Kepler-34 b · Neptune-like

Host System: Kepler-24

Spectral Class

F-type yellow-white

Effective Temperature

6,028 K — hotter than the Sun (5,778 K)

Estimated Age

3.02 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.099 R☉

Stellar Mass

1.060 M☉

Metallicity [Fe/H]

-0.07

Extended Stellar Properties

Surface gravity (log g)

4.330 dex

Stellar density

1.110 g/cm³

Metallicity ratio

[M/H]

Distance

1,156.81 parsec

Light-years 3,773.01 ly

V-band magnitude

15.04 mag

Voyager-speed travel 66,536,943 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.836 mas

Total Proper Motion

2.879 mas/yr

PM Right Ascension

-2.23 mas/yr

PM Declination

-1.82 mas/yr

Galactic Cartesian (pc)

x = 0.274 · y = -0.735 · z = 0.620

Equatorial (J2000)

RA 290.41326° · Dec 38.34373°

Galactic ℓ, b

70.550° · 11.018°

Ecliptic λ, β

302.604° · 59.493°

HTM-20 index

1799876032