Key parameters at a glance

A radius of 1.49 Earth radii
A mass of 2.83 Earth masses
Surface gravity around 1.27 g
An orbital period of 12.413 days
Semi-major axis 0.1073 AU
Equilibrium temperature 933 K (660 °C)
Distance from Earth 2,906.68 light-years
Earth Similarity Index 0.322
Travel time at Voyager 1 speed 51,259,232 years

Kepler-1256 b Planet Profile

Physical Specs

Radius

1.49 R⊕

Radius (Jupiter)

0.133 R♃

Mass

2.83 M⊕

Mass (Jupiter)

0.009 M♃

Density

4.70 g/cm³

Surface Gravity

1.27 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.322

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

#766of 1176

top 65.1%

This planet

1.49R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-174 c 1.49 R⊕ TOI-431 c 1.49 R⊕ Kepler-400 c 1.49 R⊕

Metric	Earth	Kepler-1256 b	Jupiter
Radius (R⊕)	1.00	1.49	11.21
Mass (M⊕)	1.00	2.83	317.83
Density (g/cm³)	5.51	4.70	1.33
Surface Gravity (g)	1.00	1.27	2.53
Insolation (S⊕)	1.00	211.55	0.037

Star Catalogue Identifiers

TIC

TIC 159763320

Gaia DR2

Gaia DR2 2126615024685005568

Gaia DR3

Gaia DR3 2126615024685005568

System

Kepler-1256

Percentile among Super-Earth cohort

Radius 1.490 R⊕ · percentile 34 / cohort 1176

Mass 2.830 M⊕ · percentile 32 / cohort 1176

Orbital period 12.41 d · percentile 71 / cohort 1164

Distance 891.19 pc · percentile 75 / cohort 1171

ESI 0.322 · percentile 42 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

12.413 days

Semi-major axis

0.1073 AU

Eccentricity

0.000

Inclination

87.43 °

Year Length

A year here lasts approximately 12.41 Earth days (3.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1073 AU.

Transit Fingerprint

Depth

0.011 %

Duration

4.369 h

Impact parameter b

0.130

Rp / R★

0.010040

Transit midpoint (BJD)

2,454,973.3603

Photometric dip

Transit produces a flux drop of 108 ppm lasting ≈ 4.37 h.

Extended Orbital Architecture

Planet / star radius ratio

0.010040

Semi-major axis / stellar radius

21.300

Impact parameter (b)

0.130

Transit mid-time (BJD)

2,454,973.3603

Angular separation (arcsec)

0.12000

Eq. Temperature

933K

(660 °C)

Insolation (S⊕)

211.55

Earth = 1.00

Earth Similarity (ESI)

0.322

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-1256

Spectral Class

F-type yellow-white

Effective Temperature

6,129 K — hotter than the Sun (5,778 K)

Estimated Age

3.72 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.360 R☉

Stellar Mass

1.170 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.230 dex

Stellar density

0.390 g/cm³

Metallicity ratio

[Fe/H]

Distance

891.19 parsec

Light-years 2,906.68 ly

V-band magnitude

13.69 mag

Voyager-speed travel 51,259,232 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.093 mas

Total Proper Motion

17.722 mas/yr

PM Right Ascension

-4.68 mas/yr

PM Declination

-17.09 mas/yr

Galactic Cartesian (pc)

x = 0.260 · y = -0.662 · z = 0.703

Equatorial (J2000)

RA 291.47424° · Dec 44.68341°

Galactic ℓ, b

76.743° · 13.053°

Ecliptic λ, β

308.487° · 65.278°

HTM-20 index

564690772