Key parameters at a glance

A radius of 1.91 Earth radii
A mass of 4.31 Earth masses
Surface gravity around 1.18 g
An orbital period of 2.970 days
Semi-major axis 0.0378 AU
Equilibrium temperature 991 K (718 °C)
Distance from Earth 11,286.66 light-years
Earth Similarity Index 0.279
Travel time at Voyager 1 speed 199,040,256 years

Kepler-917 b Planet Profile

Physical Specs

Radius

1.91 R⊕

Radius (Jupiter)

0.170 R♃

Mass

4.31 M⊕

Mass (Jupiter)

0.014 M♃

Density

3.40 g/cm³

Surface Gravity

1.18 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.279

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

#114of 1176

top 9.6%

This planet

1.91R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-1121 b 1.91 R⊕ Kepler-524 b 1.91 R⊕ Kepler-1306 b 1.91 R⊕

Metric	Earth	Kepler-917 b	Jupiter
Radius (R⊕)	1.00	1.91	11.21
Mass (M⊕)	1.00	4.31	317.83
Density (g/cm³)	5.51	3.40	1.33
Surface Gravity (g)	1.00	1.18	2.53
Insolation (S⊕)	1.00	228.11	0.037

Star Catalogue Identifiers

TIC

TIC 268383727

Gaia DR2

Gaia DR2 2085724496490595584

Gaia DR3

Gaia DR3 2085724496490595584

System

Kepler-917

Percentile among Super-Earth cohort

Radius 1.910 R⊕ · percentile 90 / cohort 1176

Mass 4.310 M⊕ · percentile 83 / cohort 1176

Orbital period 2.97 d · percentile 21 / cohort 1164

Distance 3,460.51 pc · percentile 99 / cohort 1171

ESI 0.279 · percentile 31 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

2.970 days

Semi-major axis

0.0378 AU

Eccentricity

0.000

Inclination

87.75 °

Year Length

A year here lasts approximately 2.97 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0378 AU.

Transit Fingerprint

Depth

0.053 %

Duration

2.216 h

Impact parameter b

0.884

Rp / R★

0.022536

Transit midpoint (BJD)

2,454,966.3922

Photometric dip

Transit produces a flux drop of 531 ppm lasting ≈ 2.22 h.

Extended Orbital Architecture

Planet / star radius ratio

0.022536

Semi-major axis / stellar radius

10.040

Impact parameter (b)

0.884

Transit mid-time (BJD)

2,454,966.3922

Angular separation (arcsec)

0.01090

Eq. Temperature

991K

(718 °C)

Insolation (S⊕)

228.11

Earth = 1.00

Earth Similarity (ESI)

0.279

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-917

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,418 K — cooler than the Sun (5,778 K)

Estimated Age

4.17 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.760 R☉

Stellar Mass

0.800 M☉

Metallicity [Fe/H]

-0.38

Extended Stellar Properties

Surface gravity (log g)

4.580 dex

Stellar density

1.921 g/cm³

Metallicity ratio

[Fe/H]

Distance

3,460.51 parsec

Light-years 11,286.66 ly

V-band magnitude

15.90 mag

Voyager-speed travel 199,040,256 yr

Multi-band Host Photometry — 15 bands

Astrometric Data

Parallax

0.252 mas

Total Proper Motion

3.964 mas/yr

PM Right Ascension

-3.03 mas/yr

PM Declination

-2.56 mas/yr

Galactic Cartesian (pc)

x = 0.325 · y = -0.586 · z = 0.743

Equatorial (J2000)

RA 299.05126° · Dec 47.94927°

Galactic ℓ, b

82.164° · 9.925°

Ecliptic λ, β

323.364° · 66.090°

HTM-20 index

885582072