Key parameters at a glance

A radius of 0.85 Earth radii
A mass of 0.54 Earth masses
Surface gravity around 0.75 g
An orbital period of 2.889 days
Semi-major axis 0.0426 AU
Equilibrium temperature 1,423 K (1150 °C)
Distance from Earth 2,246.55 light-years
Earth Similarity Index 0.208
Travel time at Voyager 1 speed 39,617,840 years

Kepler-1385 b Planet Profile

Physical Specs

Radius

0.85 R⊕

Radius (Jupiter)

0.076 R♃

Mass

0.54 M⊕

Mass (Jupiter)

0.002 M♃

Density

4.86 g/cm³

Surface Gravity

0.75 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.208

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

#454of 570

top 79.5%

This planet

0.85R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-406 c 0.85 R⊕ Kepler-1876 b 0.85 R⊕ Kepler-131 c 0.84 R⊕

Metric	Earth	Kepler-1385 b	Jupiter
Radius (R⊕)	1.00	0.85	11.21
Mass (M⊕)	1.00	0.54	317.83
Density (g/cm³)	5.51	4.86	1.33
Surface Gravity (g)	1.00	0.75	2.53
Insolation (S⊕)	1.00	1,591.48	0.037

Star Catalogue Identifiers

TIC

TIC 123495717

Gaia DR2

Gaia DR2 2107492421531881856

Gaia DR3

Gaia DR3 2107492421531881856

System

Kepler-1385

Percentile among Rocky Terrestrial cohort

Radius 0.850 R⊕ · percentile 20 / cohort 570

Mass 0.543 M⊕ · percentile 17 / cohort 570

Orbital period 2.89 d · percentile 33 / cohort 567

Distance 688.80 pc · percentile 79 / cohort 566

ESI 0.208 · percentile 15 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

2.889 days

Semi-major axis

0.0426 AU

Eccentricity

0.000

Inclination

88.09 °

Year Length

A year here lasts approximately 2.89 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0426 AU.

Transit Fingerprint

Depth

0.004 %

Duration

2.981 h

Impact parameter b

0.139

Rp / R★

0.005875

Transit midpoint (BJD)

2,454,965.3316

Photometric dip

Transit produces a flux drop of 41 ppm lasting ≈ 2.98 h.

Extended Orbital Architecture

Planet / star radius ratio

0.005875

Semi-major axis / stellar radius

7.400

Impact parameter (b)

0.139

Transit mid-time (BJD)

2,454,965.3316

Angular separation (arcsec)

0.06190

Eq. Temperature

1,423K

(1150 °C)

Insolation (S⊕)

1,591.48

Earth = 1.00

Earth Similarity (ESI)

0.208

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-1385

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,732 K — cooler than the Sun (5,778 K)

Estimated Age

4.37 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.290 R☉

Stellar Mass

1.150 M☉

Metallicity [Fe/H]

0.41

Extended Stellar Properties

Surface gravity (log g)

4.270 dex

Stellar density

0.280 g/cm³

Systemic radial velocity

-11.10 km/s

Metallicity ratio

[Fe/H]

Distance

688.80 parsec

Light-years 2,246.55 ly

V-band magnitude

12.95 mag

Voyager-speed travel 39,617,840 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.424 mas

Total Proper Motion

12.012 mas/yr

PM Right Ascension

-5.33 mas/yr

PM Declination

-10.76 mas/yr

Galactic Cartesian (pc)

x = 0.151 · y = -0.672 · z = 0.725

Equatorial (J2000)

RA 282.63136° · Dec 46.48102°

Galactic ℓ, b

76.021° · 19.457°

Ecliptic λ, β

294.653° · 68.842°

HTM-20 index

1676158462