Key parameters at a glance

A radius of 0.70 Earth radii
A mass of 0.27 Earth masses
Surface gravity around 0.55 g
An orbital period of 0.942 days
Distance from Earth 3,053.93 light-years
Earth Similarity Index 0.866
Travel time at Voyager 1 speed 53,856,094 years

KOI-4978 b Planet Profile

Physical Specs

Radius

0.70 R⊕

Radius (Jupiter)

0.062 R♃

Mass

0.27 M⊕

Mass (Jupiter)

0.001 M♃

Density

4.34 g/cm³

Surface Gravity

0.55 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.866

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

#526of 570

top 92.1%

This planet

0.70R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-378 c 0.70 R⊕ Kepler-1349 b 0.70 R⊕ GJ 367 b 0.70 R⊕

Metric	Earth	KOI-4978 b	Jupiter
Radius (R⊕)	1.00	0.70	11.21
Mass (M⊕)	1.00	0.27	317.83
Density (g/cm³)	5.51	4.34	1.33
Surface Gravity (g)	1.00	0.55	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 120962288

Gaia DR2

Gaia DR2 2099983478670059136

Gaia DR3

Gaia DR3 2099983478670059136

System

KOI-4978

Percentile among Rocky Terrestrial cohort

Radius 0.700 R⊕ · percentile 7 / cohort 570

Mass 0.271 M⊕ · percentile 6 / cohort 570

Orbital period 0.94 d · percentile 10 / cohort 567

Distance 936.34 pc · percentile 93 / cohort 566

ESI 0.866 · percentile 89 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.942 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts roughly 22.6 hours long.

Transit Fingerprint

Duration

2.200 h

Transit midpoint (BJD)

2,454,833.0990

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.866

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).

Kepler-963 c · Rocky Terrestrial Kepler-1489 c · Rocky Terrestrial Kepler-158 d · Rocky Terrestrial Kepler-879 c · Rocky Terrestrial

Host System: KOI-4978

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,050 K — cooler than the Sun (5,778 K)

Estimated Age

1.48 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.966 R☉

Stellar Mass

0.859 M☉

Metallicity [Fe/H]

0.18

Extended Stellar Properties

Surface gravity (log g)

4.402 dex

Stellar density

1.100 g/cm³

Metallicity ratio

[Fe/H]

Distance

936.34 parsec

Light-years 3,053.93 ly

V-band magnitude

15.63 mag

Voyager-speed travel 53,856,094 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

1.040 mas

Total Proper Motion

1.682 mas/yr

PM Right Ascension

1.51 mas/yr

PM Declination

0.74 mas/yr

Galactic Cartesian (pc)

x = 0.223 · y = -0.749 · z = 0.623

Equatorial (J2000)

RA 286.59076° · Dec 38.55830°

Galactic ℓ, b

69.458° · 13.823°

Ecliptic λ, β

296.921° · 60.456°

HTM-20 index

768097447