Key parameters at a glance

A radius of 2.60 Earth radii
A mass of 7.27 Earth masses
Surface gravity around 1.08 g
An orbital period of 20.311 days
Semi-major axis 0.1559 AU
Equilibrium temperature 931 K (658 °C)
Distance from Earth 1,813.98 light-years
Earth Similarity Index 0.266
Travel time at Voyager 1 speed 31,989,453 years

Kepler-911 b Planet Profile

Physical Specs

Radius

2.60 R⊕

Radius (Jupiter)

0.232 R♃

Mass

7.27 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.27 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.266

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

#1017of 1978

top 51.4%

This planet

2.60R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-155 c 2.60 R⊕ Kepler-84 e 2.60 R⊕ Kepler-115 c 2.60 R⊕

Metric	Earth	Kepler-911 b	Jupiter
Radius (R⊕)	1.00	2.60	11.21
Mass (M⊕)	1.00	7.27	317.83
Density (g/cm³)	5.51	2.27	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	198.73	0.037

Star Catalogue Identifiers

TIC

TIC 171029578

Gaia DR2

Gaia DR2 2073804411752924288

Gaia DR3

Gaia DR3 2073804411752924288

System

Kepler-911

Percentile among Sub-Neptune cohort

Radius 2.600 R⊕ · percentile 48 / cohort 1978

Mass 7.270 M⊕ · percentile 44 / cohort 1978

Orbital period 20.31 d · percentile 63 / cohort 1946

Distance 556.17 pc · percentile 50 / cohort 1975

ESI 0.266 · percentile 20 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

20.311 days

Semi-major axis

0.1559 AU

Eccentricity

0.000

Inclination

89.90 °

Year Length

A year here lasts approximately 20.31 Earth days (5.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1559 AU.

Transit Fingerprint

Depth

0.017 %

Duration

5.359 h

Impact parameter b

0.833

Rp / R★

0.011880

Transit midpoint (BJD)

2,454,979.8231

Photometric dip

Transit produces a flux drop of 168 ppm lasting ≈ 5.36 h.

Extended Orbital Architecture

Planet / star radius ratio

0.011880

Semi-major axis / stellar radius

29.160

Impact parameter (b)

0.833

Transit mid-time (BJD)

2,454,979.8231

Angular separation (arcsec)

0.28000

Eq. Temperature

931K

(658 °C)

Insolation (S⊕)

198.73

Earth = 1.00

Earth Similarity (ESI)

0.266

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-911

Spectral Class

F-type yellow-white

Effective Temperature

6,112 K — hotter than the Sun (5,778 K)

Estimated Age

3.55 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.990 R☉

Stellar Mass

1.340 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

3.970 dex

Stellar density

0.170 g/cm³

Systemic radial velocity

-47.02 km/s

Metallicity ratio

[Fe/H]

Distance

556.17 parsec

Light-years 1,813.98 ly

V-band magnitude

11.77 mag

Voyager-speed travel 31,989,453 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.770 mas

Total Proper Motion

1.982 mas/yr

PM Right Ascension

1.40 mas/yr

PM Declination

-1.40 mas/yr

Galactic Cartesian (pc)

x = 0.363 · y = -0.665 · z = 0.653

Equatorial (J2000)

RA 298.58919° · Dec 40.75069°

Galactic ℓ, b

75.705° · 6.596°

Ecliptic λ, β

315.949° · 59.712°

HTM-20 index

-234673324