Key parameters at a glance

A radius of 1.25 Earth radii
A mass of 2.10 Earth masses
Surface gravity around 1.34 g
An orbital period of 1.639 days
Semi-major axis 0.0276 AU
Equilibrium temperature 1,610 K (1337 °C)
Distance from Earth 4,519.54 light-years
Earth Similarity Index 0.180
Travel time at Voyager 1 speed 79,702,149 years

Kepler-1399 b Planet Profile

Physical Specs

Radius

1.25 R⊕

Radius (Jupiter)

0.112 R♃

Mass

2.10 M⊕

Mass (Jupiter)

0.007 M♃

Density

5.91 g/cm³

Surface Gravity

1.34 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.180

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

#1161of 1176

top 98.6%

This planet

1.25R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-445 d 1.25 R⊕ Kepler-1074 b 1.25 R⊕ Kepler-150 b 1.25 R⊕

Metric	Earth	Kepler-1399 b	Jupiter
Radius (R⊕)	1.00	1.25	11.21
Mass (M⊕)	1.00	2.10	317.83
Density (g/cm³)	5.51	5.91	1.33
Surface Gravity (g)	1.00	1.34	2.53
Insolation (S⊕)	1.00	1,707.25	0.037

Star Catalogue Identifiers

TIC

TIC 275575346

Gaia DR2

Gaia DR2 2128074351495006720

Gaia DR3

Gaia DR3 2128074351495006720

System

Kepler-1399

Percentile among Super-Earth cohort

Radius 1.250 R⊕ · percentile 0 / cohort 1176

Mass 2.100 M⊕ · percentile 2 / cohort 1176

Orbital period 1.64 d · percentile 10 / cohort 1164

Distance 1,385.70 pc · percentile 93 / cohort 1171

ESI 0.180 · percentile 9 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

1.639 days

Semi-major axis

0.0276 AU

Eccentricity

0.000

Inclination

86.56 °

Year Length

A year here lasts approximately 1.64 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0276 AU.

Transit Fingerprint

Depth

0.017 %

Duration

1.948 h

Impact parameter b

0.098

Rp / R★

0.012229

Transit midpoint (BJD)

2,454,965.2899

Photometric dip

Transit produces a flux drop of 167 ppm lasting ≈ 1.95 h.

Extended Orbital Architecture

Planet / star radius ratio

0.012229

Semi-major axis / stellar radius

6.500

Impact parameter (b)

0.098

Transit mid-time (BJD)

2,454,965.2899

Angular separation (arcsec)

0.01990

Eq. Temperature

1,610K

(1337 °C)

Insolation (S⊕)

1,707.25

Earth = 1.00

Earth Similarity (ESI)

0.180

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-1399

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,735 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]

-0.03

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

1.590 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,385.70 parsec

Light-years 4,519.54 ly

V-band magnitude

15.57 mag

Voyager-speed travel 79,702,149 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.694 mas

Total Proper Motion

8.734 mas/yr

PM Right Ascension

0.05 mas/yr

PM Declination

-8.73 mas/yr

Galactic Cartesian (pc)

x = 0.275 · y = -0.637 · z = 0.720

Equatorial (J2000)

RA 293.31170° · Dec 46.04165°

Galactic ℓ, b

78.573° · 12.484°

Ecliptic λ, β

312.615° · 66.066°

HTM-20 index

-1381504040