Key parameters at a glance

A radius of 1.07 Earth radii
A mass of 1.24 Earth masses
Surface gravity around 1.08 g
An orbital period of 31.806 days
Semi-major axis 0.1596 AU
Equilibrium temperature 378 K (105 °C)
Distance from Earth 1,573.01 light-years
Earth Similarity Index 0.806
Travel time at Voyager 1 speed 27,739,994 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1178 b Planet Profile

Physical Specs

Radius

1.07 R⊕

Radius (Jupiter)

0.095 R♃

Mass

1.24 M⊕

Mass (Jupiter)

0.004 M♃

Density

5.56 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.806

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#262of 570

top 45.8%

This planet

1.07R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-376 b 1.07 R⊕ Kepler-186 b 1.07 R⊕ Kepler-1570 b 1.07 R⊕

Metric	Earth	Kepler-1178 b	Jupiter
Radius (R⊕)	1.00	1.07	11.21
Mass (M⊕)	1.00	1.24	317.83
Density (g/cm³)	5.51	5.56	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	23.24	0.037

Star Catalogue Identifiers

TIC

TIC 158729099

Gaia DR2

Gaia DR2 2127340290041707520

Gaia DR3

Gaia DR3 2127340290041707520

System

Kepler-1178

Percentile among Rocky Terrestrial cohort

Radius 1.070 R⊕ · percentile 53 / cohort 570

Mass 1.240 M⊕ · percentile 48 / cohort 570

Orbital period 31.81 d · percentile 97 / cohort 567

Distance 482.29 pc · percentile 61 / cohort 566

ESI 0.806 · percentile 87 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

31.806 days

Semi-major axis

0.1596 AU

Eccentricity

0.000

Inclination

89.50 °

Year Length

A year here lasts approximately 31.81 Earth days (8.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1596 AU.

Transit Fingerprint

Depth

0.014 %

Duration

3.794 h

Impact parameter b

0.136

Rp / R★

0.012783

Transit midpoint (BJD)

2,454,983.6643

Photometric dip

Transit produces a flux drop of 142 ppm lasting ≈ 3.79 h.

Extended Orbital Architecture

Planet / star radius ratio

0.012783

Semi-major axis / stellar radius

64.290

Impact parameter (b)

0.136

Transit mid-time (BJD)

2,454,983.6643

Angular separation (arcsec)

0.33100

Eq. Temperature

378K

(105 °C)

Insolation (S⊕)

23.24

Earth = 1.00

Earth Similarity (ESI)

0.806

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1040 b · Sub-Neptune Kepler-1646 b · Rocky Terrestrial

Host System: Kepler-1178

Spectral Class

K-type orange

Effective Temperature

4,990 K — cooler than the Sun (5,778 K)

Estimated Age

4.68 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.750 R☉

Stellar Mass

0.800 M☉

Metallicity [Fe/H]

-0.05

Extended Stellar Properties

Surface gravity (log g)

4.590 dex

Stellar density

3.021 g/cm³

Metallicity ratio

[Fe/H]

Distance

482.29 parsec

Light-years 1,573.01 ly

V-band magnitude

14.21 mag

Voyager-speed travel 27,739,994 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.045 mas

Total Proper Motion

6.643 mas/yr

PM Right Ascension

2.90 mas/yr

PM Declination

5.98 mas/yr

Galactic Cartesian (pc)

x = 0.221 · y = -0.661 · z = 0.717

Equatorial (J2000)

RA 288.45612° · Dec 45.80223°

Galactic ℓ, b

76.892° · 15.450°

Ecliptic λ, β

304.462° · 67.046°

HTM-20 index

2002505599