Key parameters at a glance

A radius of 1.46 Earth radii
A mass of 2.73 Earth masses
Surface gravity around 1.28 g
An orbital period of 4.510 days
Semi-major axis 0.0511 AU
Equilibrium temperature 1,063 K (790 °C)
Distance from Earth 2,503.90 light-years
Earth Similarity Index 0.282
Travel time at Voyager 1 speed 44,156,325 years

Kepler-1108 b Planet Profile

Physical Specs

Radius

1.46 R⊕

Radius (Jupiter)

0.130 R♃

Mass

2.73 M⊕

Mass (Jupiter)

0.009 M♃

Density

4.82 g/cm³

Surface Gravity

1.28 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.282

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

#819of 1176

top 69.6%

This planet

1.46R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-190 c 1.46 R⊕ Kepler-808 b 1.46 R⊕ Kepler-366 b 1.46 R⊕

Metric	Earth	Kepler-1108 b	Jupiter
Radius (R⊕)	1.00	1.46	11.21
Mass (M⊕)	1.00	2.73	317.83
Density (g/cm³)	5.51	4.82	1.33
Surface Gravity (g)	1.00	1.28	2.53
Insolation (S⊕)	1.00	206.41	0.037

Star Catalogue Identifiers

TIC

TIC 272083644

Gaia DR2

Gaia DR2 2080390353264322944

Gaia DR3

Gaia DR3 2080390353264322944

System

Kepler-1108

Percentile among Super-Earth cohort

Radius 1.460 R⊕ · percentile 29 / cohort 1176

Mass 2.730 M⊕ · percentile 27 / cohort 1176

Orbital period 4.51 d · percentile 36 / cohort 1164

Distance 767.70 pc · percentile 65 / cohort 1171

ESI 0.282 · percentile 32 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

4.510 days

Semi-major axis

0.0511 AU

Eccentricity

0.000

Inclination

89.59 °

Year Length

A year here lasts approximately 4.51 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0511 AU.

Transit Fingerprint

Depth

0.030 %

Duration

2.161 h

Impact parameter b

0.152

Rp / R★

0.015817

Transit midpoint (BJD)

2,454,967.5673

Photometric dip

Transit produces a flux drop of 304 ppm lasting ≈ 2.16 h.

Extended Orbital Architecture

Planet / star radius ratio

0.015817

Semi-major axis / stellar radius

16.028

Impact parameter (b)

0.152

Transit mid-time (BJD)

2,454,967.5673

Angular separation (arcsec)

0.06660

Eq. Temperature

1,063K

(790 °C)

Insolation (S⊕)

206.41

Earth = 1.00

Earth Similarity (ESI)

0.282

0 = alien, 1 = Earth-identical

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

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-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-1108

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,406 K — cooler than the Sun (5,778 K)

Estimated Age

4.17 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.840 R☉

Stellar Mass

0.880 M☉

Metallicity [Fe/H]

-0.09

Extended Stellar Properties

Surface gravity (log g)

4.540 dex

Stellar density

3.829 g/cm³

Metallicity ratio

[Fe/H]

Distance

767.70 parsec

Light-years 2,503.90 ly

V-band magnitude

15.13 mag

Voyager-speed travel 44,156,325 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.274 mas

Total Proper Motion

7.326 mas/yr

PM Right Ascension

-6.55 mas/yr

PM Declination

-3.29 mas/yr

Galactic Cartesian (pc)

x = 0.305 · y = -0.624 · z = 0.719

Equatorial (J2000)

RA 296.04230° · Dec 45.98514°

Galactic ℓ, b

79.407° · 10.772°

Ecliptic λ, β

316.772° · 65.251°

HTM-20 index

-1981212169