Key parameters at a glance

A radius of 0.95 Earth radii
A mass of 0.80 Earth masses
Surface gravity around 0.89 g
An orbital period of 8.483 days
Semi-major axis 0.0784 AU
Equilibrium temperature 879 K (606 °C)
Distance from Earth 959.30 light-years
Earth Similarity Index 0.366
Travel time at Voyager 1 speed 16,917,194 years

Kepler-1689 b Planet Profile

Physical Specs

Radius

0.95 R⊕

Radius (Jupiter)

0.084 R♃

Mass

0.80 M⊕

Mass (Jupiter)

0.003 M♃

Density

5.17 g/cm³

Surface Gravity

0.89 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.366

HZ Position Inner

Controversial No

Discovery

Year 2020

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#381of 570

top 66.7%

This planet

0.95R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1957 b 0.94 R⊕ Kepler-271 c 0.95 R⊕ Kepler-106 d 0.95 R⊕

Metric	Earth	Kepler-1689 b	Jupiter
Radius (R⊕)	1.00	0.95	11.21
Mass (M⊕)	1.00	0.80	317.83
Density (g/cm³)	5.51	5.17	1.33
Surface Gravity (g)	1.00	0.89	2.53
Insolation (S⊕)	1.00	149.30	0.037

Star Catalogue Identifiers

TIC

TIC 137218786

Gaia DR2

Gaia DR2 2052740449026979584

Gaia DR3

Gaia DR3 2052740449026979584

System

Kepler-1689

Percentile among Rocky Terrestrial cohort

Radius 0.947 R⊕ · percentile 33 / cohort 570

Mass 0.799 M⊕ · percentile 29 / cohort 570

Orbital period 8.48 d · percentile 75 / cohort 567

Distance 294.12 pc · percentile 40 / cohort 566

ESI 0.366 · percentile 53 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

8.483 days

Semi-major axis

0.0784 AU

Eccentricity

0.000

Inclination

88.50 °

Year Length

A year here lasts approximately 8.48 Earth days (2.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0784 AU.

Transit Fingerprint

Depth

0.007 %

Duration

2.485 h

Impact parameter b

0.056

Rp / R★

0.007876

Transit midpoint (BJD)

2,454,965.9684

Photometric dip

Transit produces a flux drop of 69 ppm lasting ≈ 2.49 h.

Extended Orbital Architecture

Planet / star radius ratio

0.007876

Semi-major axis / stellar radius

26.240

Impact parameter (b)

0.056

Transit mid-time (BJD)

2,454,965.9684

Angular separation (arcsec)

0.26700

Eq. Temperature

879K

(606 °C)

Insolation (S⊕)

149.30

Earth = 1.00

Earth Similarity (ESI)

0.366

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

Armstrong et al. 2021

Instrument

Kepler CCD Array

Publication

2021-07

Observation locale

Space

Discovery cohort

Planets confirmed in 2020 at Kepler (12 shown).

Kepler-1649 c · Rocky Terrestrial Kepler-1701 b · Sub-Neptune Kepler-1690 b · Sub-Neptune Kepler-1700 b · Sub-Neptune Kepler-1684 b · Sub-Neptune Kepler-1678 b · Sub-Neptune Kepler-598 c · Sub-Neptune Kepler-1661 b · Sub-Neptune Kepler-1663 b · Sub-Neptune Kepler-1681 b · Sub-Neptune Kepler-1672 b · Sub-Neptune Kepler-1702 b · Super-Earth

Host System: Kepler-1689

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,731 K — cooler than the Sun (5,778 K)

Estimated Age

2.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.996 R☉

Stellar Mass

1.023 M☉

Metallicity [Fe/H]

-0.15

Extended Stellar Properties

Surface gravity (log g)

4.451 dex

Stellar density

1.459 g/cm³

Metallicity ratio

[M/H]

Distance

294.12 parsec

Light-years 959.30 ly

V-band magnitude

12.23 mag

Voyager-speed travel 16,917,194 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

3.371 mas

Total Proper Motion

11.123 mas/yr

PM Right Ascension

-11.12 mas/yr

PM Declination

0.30 mas/yr

Galactic Cartesian (pc)

x = 0.287 · y = -0.726 · z = 0.625

Equatorial (J2000)

RA 291.57417° · Dec 38.65594°

Galactic ℓ, b

71.244° · 10.342°

Ecliptic λ, β

304.495° · 59.538°

HTM-20 index

2139605709