Key parameters at a glance

A radius of 2.99 Earth radii
A mass of 9.21 Earth masses
Surface gravity around 1.03 g
An orbital period of 30.653 days
Semi-major axis 0.2014 AU
Equilibrium temperature 780 K (507 °C)
Distance from Earth 3,290.23 light-years
Earth Similarity Index 0.303
Travel time at Voyager 1 speed 58,023,187 years

Kepler-1717 b Planet Profile

Physical Specs

Radius

2.99 R⊕

Radius (Jupiter)

0.267 R♃

Mass

9.21 M⊕

Mass (Jupiter)

0.029 M♃

Density

1.89 g/cm³

Surface Gravity

1.03 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.303

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#538of 1978

top 27.1%

This planet

2.99R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-255 c 2.99 R⊕ MOA-2010-BLG-328L b 2.99 R⊕ Kepler-978 b 2.99 R⊕

Metric	Earth	Kepler-1717 b	Jupiter
Radius (R⊕)	1.00	2.99	11.21
Mass (M⊕)	1.00	9.21	317.83
Density (g/cm³)	5.51	1.89	1.33
Surface Gravity (g)	1.00	1.03	2.53
Insolation (S⊕)	1.00	87.69	0.037

Star Catalogue Identifiers

TIC

TIC 27396246

Gaia DR2

Gaia DR2 2134842189160723072

Gaia DR3

Gaia DR3 2134842189160723072

System

Kepler-1717

Percentile among Sub-Neptune cohort

Radius 2.989 R⊕ · percentile 73 / cohort 1978

Mass 9.210 M⊕ · percentile 67 / cohort 1978

Orbital period 30.65 d · percentile 74 / cohort 1946

Distance 1,008.79 pc · percentile 78 / cohort 1975

ESI 0.303 · percentile 28 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

30.653 days

Semi-major axis

0.2014 AU

Eccentricity

0.000

Inclination

88.89 °

Year Length

A year here lasts approximately 30.65 Earth days (8.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2014 AU.

Transit Fingerprint

Depth

0.029 %

Duration

4.903 h

Impact parameter b

0.751

Rp / R★

0.015849

Transit midpoint (BJD)

2,454,968.0419

Photometric dip

Transit produces a flux drop of 292 ppm lasting ≈ 4.90 h.

Extended Orbital Architecture

Planet / star radius ratio

0.015849

Semi-major axis / stellar radius

32.300

Impact parameter (b)

0.751

Transit mid-time (BJD)

2,454,968.0419

Angular separation (arcsec)

0.20000

Eq. Temperature

780K

(507 °C)

Insolation (S⊕)

87.69

Earth = 1.00

Earth Similarity (ESI)

0.303

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

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1717

Spectral Class

F-type yellow-white

Effective Temperature

6,200 K — hotter than the Sun (5,778 K)

Estimated Age

0.33 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.640 R☉

Stellar Mass

1.158 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.072 dex

Stellar density

0.890 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,008.79 parsec

Light-years 3,290.23 ly

V-band magnitude

13.32 mag

Voyager-speed travel 58,023,187 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.963 mas

Total Proper Motion

7.802 mas/yr

PM Right Ascension

0.32 mas/yr

PM Declination

-7.79 mas/yr

Galactic Cartesian (pc)

x = 0.276 · y = -0.587 · z = 0.761

Equatorial (J2000)

RA 295.21265° · Dec 49.56216°

Galactic ℓ, b

82.386° · 12.918°

Ecliptic λ, β

319.535° · 68.707°

HTM-20 index

-505239765