Key parameters at a glance

A radius of 2.51 Earth radii
A mass of 9.99 Earth masses
Surface gravity around 1.58 g
An orbital period of 12.330 days
Semi-major axis 0.1061 AU
Equilibrium temperature 915 K (642 °C)
Distance from Earth 3,773.01 light-years
Earth Similarity Index 0.287
Travel time at Voyager 1 speed 66,536,943 years

3 siblings around Kepler-24

Kepler-24 c 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	Sub-Neptune	2.35	11.14	8.140	1,050	2011
Kepler-24 c this	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 c Planet Profile

Physical Specs

Radius

2.51 R⊕

Radius (Jupiter)

0.224 R♃

Mass

9.99 M⊕

Mass (Jupiter)

0.031 M♃

Density

3.42 g/cm³

Surface Gravity

1.58 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.287

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

#1156of 1978

top 58.4%

This planet

2.51R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-263 b 2.51 R⊕ K2-179 b 2.51 R⊕ GJ 876 d 2.51 R⊕

Metric	Earth	Kepler-24 c	Jupiter
Radius (R⊕)	1.00	2.51	11.21
Mass (M⊕)	1.00	9.99	317.83
Density (g/cm³)	5.51	3.42	1.33
Surface Gravity (g)	1.00	1.58	2.53
Insolation (S⊕)	1.00	144.83	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	9.990 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 2.514 R⊕ · percentile 42 / cohort 1978

Mass 9.990 M⊕ · percentile 73 / cohort 1978

Orbital period 12.33 d · percentile 42 / cohort 1946

Distance 1,156.81 pc · percentile 85 / cohort 1975

ESI 0.287 · percentile 25 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

12.330 days

Semi-major axis

0.1061 AU

Eccentricity

0.014

Inclination

78.63 °

Year Length

A year here lasts approximately 12.33 Earth days (3.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1061 AU.

Transit Fingerprint

Depth

0.057 %

Duration

6.487 h

Impact parameter b

0.059

Rp / R★

0.021918

Transit midpoint (BJD)

2,454,970.5874

Photometric dip

Transit produces a flux drop of 567 ppm lasting ≈ 6.49 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021918

Semi-major axis / stellar radius

22.189

Impact parameter (b)

0.059

Transit mid-time (BJD)

2,454,970.5874

Angular separation (arcsec)

0.09170

Eq. Temperature

915K

(642 °C)

Insolation (S⊕)

144.83

Earth = 1.00

Earth Similarity (ESI)

0.287

0 = alien, 1 = Earth-identical

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

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