Key parameters at a glance

A radius of 13.11 Earth radii
A mass of 699.20 Earth masses
Surface gravity around 4.07 g
An orbital period of 6.873 days
Semi-major axis 0.0800 AU
Equilibrium temperature 1,620 K (1347 °C)
Distance from Earth 7,517.93 light-years
Earth Similarity Index 0.091
Travel time at Voyager 1 speed 132,578,660 years

Kepler-40 b Planet Profile

Physical Specs

Radius

13.11 R⊕

Radius (Jupiter)

1.170 R♃

Mass

699.20 M⊕

Mass (Jupiter)

2.200 M♃

Density

1.68 g/cm³

Surface Gravity

4.07 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.091

HZ Position Inner

Controversial No

Discovery

Year 2010

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#908of 1771

top 51.2%

This planet

13.11R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

CoRoT-16 b 13.11 R⊕ TOI-677 b 13.11 R⊕ HAT-P-29 b 13.11 R⊕

Metric	Earth	Kepler-40 b	Jupiter
Radius (R⊕)	1.00	13.11	11.21
Mass (M⊕)	1.00	699.20	317.83
Density (g/cm³)	5.51	1.68	1.33
Surface Gravity (g)	1.00	4.07	2.53
Insolation (S⊕)	1.00	1,187.97	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	699.200 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 272840455

Gaia DR2

Gaia DR2 2086577373912703104

Gaia DR3

Gaia DR3 2086577373912703104

System

Kepler-40

Percentile among Gas Giant cohort

Radius 13.110 R⊕ · percentile 49 / cohort 1771

Mass 699.200 M⊕ · percentile 57 / cohort 1747

Orbital period 6.87 d · percentile 41 / cohort 1533

Distance 2,305.01 pc · percentile 90 / cohort 1759

ESI 0.091 · percentile 23 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

6.873 days

Semi-major axis

0.0800 AU

Eccentricity

0.000

Inclination

89.70 °

Year Length

A year here lasts approximately 6.87 Earth days (1.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0800 AU.

Transit Fingerprint

Depth

0.375 %

Duration

6.860 h

Impact parameter b

0.045

Rp / R★

0.056500

Transit midpoint (BJD)

2,455,005.5198

Photometric dip

Transit produces a flux drop of 3,754 ppm lasting ≈ 6.86 h.

Extended Orbital Architecture

Planet / star radius ratio

0.056500

Semi-major axis / stellar radius

8.110

Impact parameter (b)

0.045

RV semi-amplitude (K)

179.000 m/s

Transit mid-time (BJD)

2,455,005.5198

Angular separation (arcsec)

0.03470

Eq. Temperature

1,620K

(1347 °C)

Insolation (S⊕)

1,187.97

Earth = 1.00

Earth Similarity (ESI)

0.091

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Santerne et al. 2011

Instrument

Kepler CCD Array

Publication

2011-04

Observation locale

Space

Discovery cohort

Planets confirmed in 2010 at Kepler (11 shown).

Kepler-11 g · Sub-Neptune Kepler-11 f · Sub-Neptune Kepler-11 d · Sub-Neptune Kepler-11 e · Neptune-like Kepler-11 b · Super-Earth Kepler-9 c · Neptune-like Kepler-11 c · Sub-Neptune Kepler-9 b · Neptune-like Kepler-9 d · Super-Earth Kepler-8 b · Gas Giant KOI-217 b · Gas Giant

Host System: Kepler-40

Spectral Class

F-type yellow-white

Effective Temperature

6,510 K — hotter than the Sun (5,778 K)

Estimated Age

2.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

2.130 R☉

Stellar Mass

1.480 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

3.940 dex

Stellar density

0.213 g/cm³

Systemic radial velocity

6.57 km/s

Rotational v·sin i

9.00 km/s

Metallicity ratio

[Fe/H]

Distance

2,305.01 parsec

Light-years 7,517.93 ly

V-band magnitude

14.66 mag

Voyager-speed travel 132,578,660 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.405 mas

Total Proper Motion

6.933 mas/yr

PM Right Ascension

-1.54 mas/yr

PM Declination

-6.76 mas/yr

Galactic Cartesian (pc)

x = 0.305 · y = -0.603 · z = 0.738

Equatorial (J2000)

RA 296.81369° · Dec 47.52654°

Galactic ℓ, b

81.045° · 11.035°

Ecliptic λ, β

319.565° · 66.412°

HTM-20 index

1259469253