Key parameters at a glance

A radius of 0.93 Earth radii
A mass of 0.75 Earth masses
Surface gravity around 0.87 g
An orbital period of 2.280 days
Semi-major axis 0.0310 AU
Equilibrium temperature 1,123 K (850 °C)
Distance from Earth 1,485.18 light-years
Earth Similarity Index 0.279
Travel time at Voyager 1 speed 26,191,103 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1387 b Planet Profile

Physical Specs

Radius

0.93 R⊕

Radius (Jupiter)

0.083 R♃

Mass

0.75 M⊕

Mass (Jupiter)

0.002 M♃

Density

5.12 g/cm³

Surface Gravity

0.87 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.279

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

#391of 570

top 68.4%

This planet

0.93R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-398 b 0.93 R⊕ Kepler-1421 b 0.93 R⊕ Gliese 12 b 0.93 R⊕

Metric	Earth	Kepler-1387 b	Jupiter
Radius (R⊕)	1.00	0.93	11.21
Mass (M⊕)	1.00	0.75	317.83
Density (g/cm³)	5.51	5.12	1.33
Surface Gravity (g)	1.00	0.87	2.53
Insolation (S⊕)	1.00	300.31	0.037

Star Catalogue Identifiers

TIC

TIC 63284044

Gaia DR2

Gaia DR2 2125871960984455552

Gaia DR3

Gaia DR3 2125871960984455552

System

Kepler-1387

Percentile among Rocky Terrestrial cohort

Radius 0.930 R⊕ · percentile 31 / cohort 570

Mass 0.749 M⊕ · percentile 27 / cohort 570

Orbital period 2.28 d · percentile 25 / cohort 567

Distance 455.36 pc · percentile 59 / cohort 566

ESI 0.279 · percentile 32 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

2.280 days

Semi-major axis

0.0310 AU

Eccentricity

0.000

Inclination

89.83 °

Year Length

A year here lasts approximately 2.28 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0310 AU.

Transit Fingerprint

Depth

0.013 %

Duration

1.592 h

Impact parameter b

0.033

Rp / R★

0.010661

Transit midpoint (BJD)

2,454,966.3577

Photometric dip

Transit produces a flux drop of 127 ppm lasting ≈ 1.59 h.

Extended Orbital Architecture

Planet / star radius ratio

0.010661

Semi-major axis / stellar radius

10.870

Impact parameter (b)

0.033

Transit mid-time (BJD)

2,454,966.3577

Angular separation (arcsec)

0.06810

Eq. Temperature

1,123K

(850 °C)

Insolation (S⊕)

300.31

Earth = 1.00

Earth Similarity (ESI)

0.279

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. 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-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-1387

Spectral Class

K-type orange

Effective Temperature

5,046 K — cooler than the Sun (5,778 K)

Estimated Age

4.37 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.770 R☉

Stellar Mass

0.820 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.580 dex

Stellar density

4.671 g/cm³

Metallicity ratio

[Fe/H]

Distance

455.36 parsec

Light-years 1,485.18 ly

V-band magnitude

14.73 mag

Voyager-speed travel 26,191,103 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.167 mas

Total Proper Motion

20.515 mas/yr

PM Right Ascension

-10.21 mas/yr

PM Declination

-17.80 mas/yr

Galactic Cartesian (pc)

x = 0.278 · y = -0.674 · z = 0.685

Equatorial (J2000)

RA 292.44030° · Dec 43.20935°

Galactic ℓ, b

75.695° · 11.785°

Ecliptic λ, β

308.821° · 63.655°

HTM-20 index

-707619256