Key parameters at a glance

A radius of 2.81 Earth radii
A mass of 8.30 Earth masses
Surface gravity around 1.05 g
An orbital period of 234.636 days
Semi-major axis 0.7097 AU
Equilibrium temperature 267 K (-6 °C)
Distance from Earth 2,295.45 light-years
Earth Similarity Index 0.696
Travel time at Voyager 1 speed 40,480,259 years

Kepler-1690 b Planet Profile

Physical Specs

Radius

2.81 R⊕

Radius (Jupiter)

0.251 R♃

Mass

8.30 M⊕

Mass (Jupiter)

0.026 M♃

Density

2.05 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.696

HZ Position Habitable

Controversial No

Discovery

Year 2020

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#731of 1978

top 36.9%

This planet

2.81R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-752 b 2.81 R⊕ Kepler-1234 b 2.81 R⊕ Kepler-892 b 2.81 R⊕

Metric	Earth	Kepler-1690 b	Jupiter
Radius (R⊕)	1.00	2.81	11.21
Mass (M⊕)	1.00	8.30	317.83
Density (g/cm³)	5.51	2.05	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	1.20	0.037

Star Catalogue Identifiers

TIC

TIC 121462999

Gaia DR2

Gaia DR2 2102384846425680768

Gaia DR3

Gaia DR3 2102384846425680768

System

Kepler-1690

Percentile among Sub-Neptune cohort

Radius 2.811 R⊕ · percentile 63 / cohort 1978

Mass 8.300 M⊕ · percentile 57 / cohort 1978

Orbital period 234.64 d · percentile 99 / cohort 1946

Distance 703.79 pc · percentile 60 / cohort 1975

ESI 0.696 · percentile 92 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

234.636 days

Semi-major axis

0.7097 AU

Eccentricity

0.000

Inclination

89.99 °

Year Length

A year here lasts approximately 234.64 Earth days (64.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.7097 AU.

Transit Fingerprint

Depth

0.093 %

Duration

6.897 h

Impact parameter b

0.025

Rp / R★

0.027707

Transit midpoint (BJD)

2,455,005.6461

Photometric dip

Transit produces a flux drop of 926 ppm lasting ≈ 6.90 h.

Extended Orbital Architecture

Planet / star radius ratio

0.027707

Semi-major axis / stellar radius

267.070

Impact parameter (b)

0.025

Transit mid-time (BJD)

2,455,005.6461

Angular separation (arcsec)

1.01000

Eq. Temperature

267K

(-6 °C)

Insolation (S⊕)

1.20

Earth = 1.00

Earth Similarity (ESI)

0.696

0 = alien, 1 = Earth-identical

Within the conservative habitable zone — surface water would be frozen.

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-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 Kepler-1674 b · Sub-Neptune

Host System: Kepler-1690

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,404 K — cooler than the Sun (5,778 K)

Estimated Age

8.50 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.862 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.540 dex

Stellar density

2.067 g/cm³

Metallicity ratio

[Fe/H]

Distance

703.79 parsec

Light-years 2,295.45 ly

V-band magnitude

14.88 mag

Voyager-speed travel 40,480,259 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.392 mas

Total Proper Motion

7.513 mas/yr

PM Right Ascension

-6.67 mas/yr

PM Declination

-3.45 mas/yr

Galactic Cartesian (pc)

x = 0.232 · y = -0.707 · z = 0.668

Equatorial (J2000)

RA 288.15666° · Dec 41.87794°

Galactic ℓ, b

73.084° · 14.076°

Ecliptic λ, β

301.165° · 63.366°

HTM-20 index

-1241516597