Key parameters at a glance

A radius of 1.72 Earth radii
A mass of 3.61 Earth masses
Surface gravity around 1.22 g
An orbital period of 47.450 days
Semi-major axis 0.2586 AU
Equilibrium temperature 551 K (278 °C)
Distance from Earth 3,908.16 light-years
Earth Similarity Index 0.520
Travel time at Voyager 1 speed 68,920,473 years

Kepler-1397 b Planet Profile

Physical Specs

Radius

1.72 R⊕

Radius (Jupiter)

0.153 R♃

Mass

3.61 M⊕

Mass (Jupiter)

0.011 M♃

Density

3.90 g/cm³

Surface Gravity

1.22 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.520

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

#373of 1176

top 31.6%

This planet

1.72R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

HD 20329 b 1.72 R⊕ Kepler-404 c 1.72 R⊕ Kepler-560 b 1.72 R⊕

Metric	Earth	Kepler-1397 b	Jupiter
Radius (R⊕)	1.00	1.72	11.21
Mass (M⊕)	1.00	3.61	317.83
Density (g/cm³)	5.51	3.90	1.33
Surface Gravity (g)	1.00	1.22	2.53
Insolation (S⊕)	1.00	58.10	0.037

Star Catalogue Identifiers

TIC

TIC 269030207

Gaia DR2

Gaia DR2 2085625368643700736

Gaia DR3

Gaia DR3 2085625368643700736

System

Kepler-1397

Percentile among Super-Earth cohort

Radius 1.720 R⊕ · percentile 68 / cohort 1176

Mass 3.610 M⊕ · percentile 62 / cohort 1176

Orbital period 47.45 d · percentile 96 / cohort 1164

Distance 1,198.25 pc · percentile 89 / cohort 1171

ESI 0.520 · percentile 74 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

47.450 days

Semi-major axis

0.2586 AU

Eccentricity

0.000

Inclination

89.97 °

Year Length

A year here lasts approximately 47.45 Earth days (13.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2586 AU.

Transit Fingerprint

Depth

0.021 %

Duration

10.747 h

Impact parameter b

0.018

Rp / R★

0.013742

Transit midpoint (BJD)

2,455,006.4540

Photometric dip

Transit produces a flux drop of 206 ppm lasting ≈ 10.75 h.

Extended Orbital Architecture

Planet / star radius ratio

0.013742

Semi-major axis / stellar radius

34.194

Impact parameter (b)

0.018

Transit mid-time (BJD)

2,455,006.4540

Angular separation (arcsec)

0.21600

Eq. Temperature

551K

(278 °C)

Insolation (S⊕)

58.10

Earth = 1.00

Earth Similarity (ESI)

0.520

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

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-1397

Spectral Class

F-type yellow-white

Effective Temperature

6,026 K — hotter than the Sun (5,778 K)

Estimated Age

3.55 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.120 R☉

Stellar Mass

1.090 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.370 dex

Stellar density

0.220 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,198.25 parsec

Light-years 3,908.16 ly

V-band magnitude

14.32 mag

Voyager-speed travel 68,920,473 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.806 mas

Total Proper Motion

3.784 mas/yr

PM Right Ascension

1.55 mas/yr

PM Declination

-3.45 mas/yr

Galactic Cartesian (pc)

x = 0.337 · y = -0.592 · z = 0.732

Equatorial (J2000)

RA 299.67588° · Dec 47.07582°

Galactic ℓ, b

81.612° · 9.123°

Ecliptic λ, β

323.265° · 65.121°

HTM-20 index

97708471