Key parameters at a glance

A radius of 0.40 Earth radii
A mass of 0.04 Earth masses
Surface gravity around 0.23 g
An orbital period of 0.647 days
Distance from Earth 2,617.96 light-years
Earth Similarity Index 0.670
Travel time at Voyager 1 speed 46,167,773 years

1 sibling around Kepler-879

Kepler-879 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-879 c this	Rocky Terrestrial	0.40	0.04	0.647	—	2024
Kepler-879 b	Sub-Neptune	2.57	7.13	33.386	580	2016

Kepler-879 c Planet Profile

Physical Specs

Radius

0.40 R⊕

Radius (Jupiter)

0.036 R♃

Mass

0.04 M⊕

Mass (Jupiter)

0.000 M♃

Density

3.13 g/cm³

Surface Gravity

0.23 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.670

HZ Position Unknown

Controversial No

Discovery

Year 2024

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#567of 570

top 99.3%

This planet

0.40R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-444 b 0.40 R⊕ Kepler-158 d 0.43 R⊕ Kepler-37 e 0.37 R⊕

Metric	Earth	Kepler-879 c	Jupiter
Radius (R⊕)	1.00	0.40	11.21
Mass (M⊕)	1.00	0.04	317.83
Density (g/cm³)	5.51	3.13	1.33
Surface Gravity (g)	1.00	0.23	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 27639443

Gaia DR2

Gaia DR2 2135398473324811392

Gaia DR3

Gaia DR3 2135398473324811392

System

Kepler-879

Percentile among Rocky Terrestrial cohort

Radius 0.400 R⊕ · percentile 1 / cohort 570

Mass 0.036 M⊕ · percentile 0 / cohort 570

Orbital period 0.65 d · percentile 5 / cohort 567

Distance 802.67 pc · percentile 86 / cohort 566

ESI 0.670 · percentile 81 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.647 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts roughly 15.5 hours long.

Transit Fingerprint

Duration

1.700 h

Transit midpoint (BJD)

2,454,833.2060

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.670

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Wang et al. 2024

Instrument

Kepler CCD Array

Publication

2024-11

Observation locale

Space

Discovery cohort

Planets confirmed in 2024 at Kepler (4 shown).

KOI-4978 b · Rocky Terrestrial Kepler-963 c · Rocky Terrestrial Kepler-1489 c · Rocky Terrestrial Kepler-158 d · Rocky Terrestrial

Host System: Kepler-879

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,457 K — cooler than the Sun (5,778 K)

Estimated Age

4.27 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.022 R☉

Stellar Mass

0.974 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.420 dex

Stellar density

1.600 g/cm³

Metallicity ratio

[Fe/H]

Distance

802.67 parsec

Light-years 2,617.96 ly

V-band magnitude

14.43 mag

Voyager-speed travel 46,167,773 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.217 mas

Total Proper Motion

9.174 mas/yr

PM Right Ascension

-3.64 mas/yr

PM Declination

-8.42 mas/yr

Galactic Cartesian (pc)

x = 0.274 · y = -0.568 · z = 0.776

Equatorial (J2000)

RA 295.80655° · Dec 50.90975°

Galactic ℓ, b

83.796° · 13.190°

Ecliptic λ, β

322.306° · 69.703°

HTM-20 index

-204279710