Key parameters at a glance

A radius of 0.89 Earth radii
A mass of 0.64 Earth masses
Surface gravity around 0.81 g
An orbital period of 2.998 days
Semi-major axis 0.0422 AU
Equilibrium temperature 1,616 K (1343 °C)
Distance from Earth 1,745.09 light-years
Earth Similarity Index 0.182
Travel time at Voyager 1 speed 30,774,681 years

Kepler-1408 b Planet Profile

Physical Specs

Radius

0.89 R⊕

Radius (Jupiter)

0.079 R♃

Mass

0.64 M⊕

Mass (Jupiter)

0.002 M♃

Density

4.99 g/cm³

Surface Gravity

0.81 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.182

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

#418of 570

top 73.2%

This planet

0.89R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-353 b 0.89 R⊕ Kepler-387 c 0.89 R⊕ Kepler-303 b 0.89 R⊕

Metric	Earth	Kepler-1408 b	Jupiter
Radius (R⊕)	1.00	0.89	11.21
Mass (M⊕)	1.00	0.64	317.83
Density (g/cm³)	5.51	4.99	1.33
Surface Gravity (g)	1.00	0.81	2.53
Insolation (S⊕)	1.00	1,982.27	0.037

Star Catalogue Identifiers

TIC

TIC 123496782

Gaia DR2

Gaia DR2 2106958363820214016

Gaia DR3

Gaia DR3 2106958363820214016

System

Kepler-1408

Percentile among Rocky Terrestrial cohort

Radius 0.890 R⊕ · percentile 25 / cohort 570

Mass 0.640 M⊕ · percentile 21 / cohort 570

Orbital period 3.00 d · percentile 34 / cohort 567

Distance 535.05 pc · percentile 67 / cohort 566

ESI 0.182 · percentile 10 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

2.998 days

Semi-major axis

0.0422 AU

Eccentricity

0.000

Inclination

85.24 °

Year Length

A year here lasts approximately 3.00 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0422 AU.

Transit Fingerprint

Depth

0.005 %

Duration

4.392 h

Impact parameter b

0.403

Rp / R★

0.006213

Transit midpoint (BJD)

2,454,964.7668

Photometric dip

Transit produces a flux drop of 45 ppm lasting ≈ 4.39 h.

Extended Orbital Architecture

Planet / star radius ratio

0.006213

Semi-major axis / stellar radius

5.090

Impact parameter (b)

0.403

Transit mid-time (BJD)

2,454,964.7668

Angular separation (arcsec)

0.07880

Eq. Temperature

1,616K

(1343 °C)

Insolation (S⊕)

1,982.27

Earth = 1.00

Earth Similarity (ESI)

0.182

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-1408

Spectral Class

F-type yellow-white

Effective Temperature

6,170 K — hotter than the Sun (5,778 K)

Estimated Age

2.57 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.350 R☉

Stellar Mass

1.210 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.250 dex

Stellar density

0.220 g/cm³

Systemic radial velocity

-29.04 km/s

Metallicity ratio

[Fe/H]

Distance

535.05 parsec

Light-years 1,745.09 ly

V-band magnitude

12.12 mag

Voyager-speed travel 30,774,681 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.840 mas

Total Proper Motion

8.001 mas/yr

PM Right Ascension

-7.74 mas/yr

PM Declination

2.03 mas/yr

Galactic Cartesian (pc)

x = 0.154 · y = -0.685 · z = 0.712

Equatorial (J2000)

RA 282.69988° · Dec 45.42579°

Galactic ℓ, b

74.984° · 19.060°

Ecliptic λ, β

294.103° · 67.805°

HTM-20 index

-313317691