Key parameters at a glance

A radius of 1.22 Earth radii
A mass of 1.98 Earth masses
Surface gravity around 1.33 g
An orbital period of 1.341 days
Semi-major axis 0.0253 AU
Equilibrium temperature 1,783 K (1510 °C)
Distance from Earth 948.60 light-years
Earth Similarity Index 0.160
Travel time at Voyager 1 speed 16,728,593 years

Kepler-908 b Planet Profile

Physical Specs

Radius

1.22 R⊕

Radius (Jupiter)

0.109 R♃

Mass

1.98 M⊕

Mass (Jupiter)

0.006 M♃

Density

5.99 g/cm³

Surface Gravity

1.33 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.160

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

#35of 570

top 6.0%

This planet

1.22R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-295 b 1.22 R⊕ Kepler-226 d 1.22 R⊕ Kepler-197 d 1.22 R⊕

Metric	Earth	Kepler-908 b	Jupiter
Radius (R⊕)	1.00	1.22	11.21
Mass (M⊕)	1.00	1.98	317.83
Density (g/cm³)	5.51	5.99	1.33
Surface Gravity (g)	1.00	1.33	2.53
Insolation (S⊕)	1.00	3,304.10	0.037

Star Catalogue Identifiers

TIC

TIC 139106731

Gaia DR2

Gaia DR2 2076194101502797952

Gaia DR3

Gaia DR3 2076194101502797952

System

Kepler-908

Percentile among Rocky Terrestrial cohort

Radius 1.220 R⊕ · percentile 92 / cohort 570

Mass 1.980 M⊕ · percentile 83 / cohort 570

Orbital period 1.34 d · percentile 14 / cohort 567

Distance 290.84 pc · percentile 40 / cohort 566

ESI 0.160 · percentile 7 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

1.341 days

Semi-major axis

0.0253 AU

Eccentricity

0.000

Inclination

89.94 °

Year Length

A year here lasts approximately 1.34 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0253 AU.

Transit Fingerprint

Depth

0.011 %

Duration

1.609 h

Impact parameter b

0.583

Rp / R★

0.009561

Transit midpoint (BJD)

2,454,965.2444

Photometric dip

Transit produces a flux drop of 110 ppm lasting ≈ 1.61 h.

Extended Orbital Architecture

Planet / star radius ratio

0.009561

Semi-major axis / stellar radius

6.445

Impact parameter (b)

0.583

Transit mid-time (BJD)

2,454,965.2444

Angular separation (arcsec)

0.08690

Eq. Temperature

1,783K

(1510 °C)

Insolation (S⊕)

3,304.10

Earth = 1.00

Earth Similarity (ESI)

0.160

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-908

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,973 K — hotter than the Sun (5,778 K)

Estimated Age

3.02 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.120 R☉

Stellar Mass

1.110 M☉

Metallicity [Fe/H]

0.15

Extended Stellar Properties

Surface gravity (log g)

4.380 dex

Stellar density

0.560 g/cm³

Systemic radial velocity

-24.88 km/s

Metallicity ratio

[Fe/H]

Distance

290.84 parsec

Light-years 948.60 ly

V-band magnitude

11.61 mag

Voyager-speed travel 16,728,593 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.410 mas

Total Proper Motion

11.327 mas/yr

PM Right Ascension

8.14 mas/yr

PM Declination

-7.88 mas/yr

Galactic Cartesian (pc)

x = 0.331 · y = -0.699 · z = 0.634

Equatorial (J2000)

RA 295.32254° · Dec 39.37646°

Galactic ℓ, b

73.258° · 8.095°

Ecliptic λ, β

310.379° · 59.316°

HTM-20 index

-1972351652