Key parameters at a glance

A radius of 4.83 Earth radii
A mass of 20.80 Earth masses
Surface gravity around 0.89 g
An orbital period of 4.126 days
Semi-major axis 0.0529 AU
Equilibrium temperature 1,243 K (970 °C)
Distance from Earth 6,729.94 light-years
Earth Similarity Index 0.149
Travel time at Voyager 1 speed 118,682,406 years

Kepler-669 b Planet Profile

Physical Specs

Radius

4.83 R⊕

Radius (Jupiter)

0.431 R♃

Mass

20.80 M⊕

Mass (Jupiter)

0.066 M♃

Density

1.01 g/cm³

Surface Gravity

0.89 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.149

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

#410of 574

top 71.3%

This planet

4.83R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-6109 c 4.83 R⊕ Kepler-82 f 4.84 R⊕ Kepler-1640 b 4.82 R⊕

Metric	Earth	Kepler-669 b	Jupiter
Radius (R⊕)	1.00	4.83	11.21
Mass (M⊕)	1.00	20.80	317.83
Density (g/cm³)	5.51	1.01	1.33
Surface Gravity (g)	1.00	0.89	2.53
Insolation (S⊕)	1.00	826.77	0.037

Star Catalogue Identifiers

TIC

TIC 26541079

Gaia DR2

Gaia DR2 2129753610686818176

Gaia DR3

Gaia DR3 2129753610686818176

System

Kepler-669

Percentile among Neptune-like cohort

Radius 4.830 R⊕ · percentile 29 / cohort 574

Mass 20.800 M⊕ · percentile 32 / cohort 574

Orbital period 4.13 d · percentile 14 / cohort 524

Distance 2,063.41 pc · percentile 90 / cohort 572

ESI 0.149 · percentile 13 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

4.126 days

Semi-major axis

0.0529 AU

Eccentricity

0.000

Inclination

85.95 °

Year Length

A year here lasts approximately 4.13 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0529 AU.

Transit Fingerprint

Depth

0.149 %

Duration

3.139 h

Impact parameter b

0.670

Rp / R★

0.036990

Transit midpoint (BJD)

2,455,002.7520

Photometric dip

Transit produces a flux drop of 1,487 ppm lasting ≈ 3.14 h.

Extended Orbital Architecture

Planet / star radius ratio

0.036990

Semi-major axis / stellar radius

7.800

Impact parameter (b)

0.670

Transit mid-time (BJD)

2,455,002.7520

Angular separation (arcsec)

0.02560

Eq. Temperature

1,243K

(970 °C)

Insolation (S⊕)

826.77

Earth = 1.00

Earth Similarity (ESI)

0.149

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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-669

Spectral Class

F-type yellow-white

Effective Temperature

6,038 K — hotter than the Sun (5,778 K)

Estimated Age

3.16 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.200 R☉

Stellar Mass

1.150 M☉

Metallicity [Fe/H]

0.14

Extended Stellar Properties

Surface gravity (log g)

4.340 dex

Stellar density

0.994 g/cm³

Metallicity ratio

[Fe/H]

Distance

2,063.41 parsec

Light-years 6,729.94 ly

V-band magnitude

15.74 mag

Voyager-speed travel 118,682,406 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.455 mas

Total Proper Motion

8.822 mas/yr

PM Right Ascension

-1.81 mas/yr

PM Declination

-8.63 mas/yr

Galactic Cartesian (pc)

x = 0.244 · y = -0.605 · z = 0.758

Equatorial (J2000)

RA 291.93616° · Dec 49.25395°

Galactic ℓ, b

81.145° · 14.704°

Ecliptic λ, β

313.811° · 69.379°

HTM-20 index

716193846