Key parameters at a glance

A radius of 2.93 Earth radii
A mass of 8.91 Earth masses
Surface gravity around 1.04 g
An orbital period of 3.168 days
Semi-major axis 0.0426 AU
Equilibrium temperature 1,221 K (948 °C)
Distance from Earth 4,547.33 light-years
Earth Similarity Index 0.189
Travel time at Voyager 1 speed 80,192,199 years

Kepler-708 b Planet Profile

Physical Specs

Radius

2.93 R⊕

Radius (Jupiter)

0.261 R♃

Mass

8.91 M⊕

Mass (Jupiter)

0.028 M♃

Density

1.95 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.189

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

#585of 1978

top 29.5%

This planet

2.93R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-125 d 2.93 R⊕ Kepler-221 c 2.93 R⊕ TOI-2015 c 2.93 R⊕

Metric	Earth	Kepler-708 b	Jupiter
Radius (R⊕)	1.00	2.93	11.21
Mass (M⊕)	1.00	8.91	317.83
Density (g/cm³)	5.51	1.95	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	684.77	0.037

Star Catalogue Identifiers

TIC

TIC 270706782

Gaia DR2

Gaia DR2 2077722010342674944

Gaia DR3

Gaia DR3 2077722010342674944

System

Kepler-708

Percentile among Sub-Neptune cohort

Radius 2.930 R⊕ · percentile 70 / cohort 1978

Mass 8.910 M⊕ · percentile 64 / cohort 1978

Orbital period 3.17 d · percentile 5 / cohort 1946

Distance 1,394.22 pc · percentile 91 / cohort 1975

ESI 0.189 · percentile 6 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.168 days

Semi-major axis

0.0426 AU

Eccentricity

0.000

Inclination

89.87 °

Year Length

A year here lasts approximately 3.17 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0426 AU.

Transit Fingerprint

Depth

0.078 %

Duration

2.188 h

Impact parameter b

0.026

Rp / R★

0.027925

Transit midpoint (BJD)

2,455,005.1486

Photometric dip

Transit produces a flux drop of 781 ppm lasting ≈ 2.19 h.

Extended Orbital Architecture

Planet / star radius ratio

0.027925

Semi-major axis / stellar radius

11.389

Impact parameter (b)

0.026

Transit mid-time (BJD)

2,455,005.1486

Angular separation (arcsec)

0.03060

Eq. Temperature

1,221K

(948 °C)

Insolation (S⊕)

684.77

Earth = 1.00

Earth Similarity (ESI)

0.189

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-708

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,692 K — cooler than the Sun (5,778 K)

Estimated Age

4.37 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.960 R☉

Stellar Mass

0.970 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

2.785 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,394.22 parsec

Light-years 4,547.33 ly

V-band magnitude

15.61 mag

Voyager-speed travel 80,192,199 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.690 mas

Total Proper Motion

2.049 mas/yr

PM Right Ascension

0.97 mas/yr

PM Declination

1.81 mas/yr

Galactic Cartesian (pc)

x = 0.299 · y = -0.678 · z = 0.672

Equatorial (J2000)

RA 293.81646° · Dec 42.21252°

Galactic ℓ, b

75.253° · 10.432°

Ecliptic λ, β

310.157° · 62.371°

HTM-20 index

-891712998