Key parameters at a glance

A radius of 1.15 Earth radii
A mass of 1.60 Earth masses
Surface gravity around 1.21 g
An orbital period of 4.866 days
Semi-major axis 0.0579 AU
Equilibrium temperature 1,121 K (848 °C)
Distance from Earth 2,812.07 light-years
Earth Similarity Index 0.278
Travel time at Voyager 1 speed 49,590,876 years

Kepler-1240 b Planet Profile

Physical Specs

Radius

1.15 R⊕

Radius (Jupiter)

0.103 R♃

Mass

1.60 M⊕

Mass (Jupiter)

0.005 M♃

Density

5.78 g/cm³

Surface Gravity

1.21 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.278

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

#160of 570

top 27.9%

This planet

1.15R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-339 c 1.15 R⊕ Kepler-1468 c 1.15 R⊕ Kepler-1199 b 1.15 R⊕

Metric	Earth	Kepler-1240 b	Jupiter
Radius (R⊕)	1.00	1.15	11.21
Mass (M⊕)	1.00	1.60	317.83
Density (g/cm³)	5.51	5.78	1.33
Surface Gravity (g)	1.00	1.21	2.53
Insolation (S⊕)	1.00	539.13	0.037

Star Catalogue Identifiers

TIC

TIC 258203566

Gaia DR2

Gaia DR2 2103567611698320896

Gaia DR3

Gaia DR3 2103567611698320896

System

Kepler-1240

Percentile among Rocky Terrestrial cohort

Radius 1.150 R⊕ · percentile 71 / cohort 570

Mass 1.600 M⊕ · percentile 65 / cohort 570

Orbital period 4.87 d · percentile 53 / cohort 567

Distance 862.19 pc · percentile 89 / cohort 566

ESI 0.278 · percentile 31 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

4.866 days

Semi-major axis

0.0579 AU

Eccentricity

0.000

Inclination

89.38 °

Year Length

A year here lasts approximately 4.87 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0579 AU.

Transit Fingerprint

Depth

0.014 %

Duration

2.231 h

Impact parameter b

0.176

Rp / R★

0.010978

Transit midpoint (BJD)

2,454,967.0171

Photometric dip

Transit produces a flux drop of 144 ppm lasting ≈ 2.23 h.

Extended Orbital Architecture

Planet / star radius ratio

0.010978

Semi-major axis / stellar radius

16.820

Impact parameter (b)

0.176

Transit mid-time (BJD)

2,454,967.0171

Angular separation (arcsec)

0.06720

Eq. Temperature

1,121K

(848 °C)

Insolation (S⊕)

539.13

Earth = 1.00

Earth Similarity (ESI)

0.278

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-1240

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,682 K — cooler than the Sun (5,778 K)

Estimated Age

4.07 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.960 R☉

Stellar Mass

0.980 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

0.490 g/cm³

Metallicity ratio

[Fe/H]

Distance

862.19 parsec

Light-years 2,812.07 ly

V-band magnitude

14.09 mag

Voyager-speed travel 49,590,876 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

1.131 mas

Total Proper Motion

9.659 mas/yr

PM Right Ascension

6.47 mas/yr

PM Declination

-7.17 mas/yr

Galactic Cartesian (pc)

x = 0.171 · y = -0.740 · z = 0.650

Equatorial (J2000)

RA 282.99977° · Dec 40.55743°

Galactic ℓ, b

70.268° · 17.147°

Ecliptic λ, β

292.112° · 63.002°

HTM-20 index

-870230796