Key parameters at a glance

A radius of 3.03 Earth radii
A mass of 9.45 Earth masses
Surface gravity around 1.03 g
An orbital period of 14.387 days
Semi-major axis 0.1137 AU
Equilibrium temperature 776 K (503 °C)
Distance from Earth 2,043.99 light-years
Earth Similarity Index 0.303
Travel time at Voyager 1 speed 36,045,767 years

Kepler-1664 b Planet Profile

Physical Specs

Radius

3.03 R⊕

Radius (Jupiter)

0.271 R♃

Mass

9.45 M⊕

Mass (Jupiter)

0.030 M♃

Density

1.86 g/cm³

Surface Gravity

1.03 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.303

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

#489of 1978

top 24.7%

This planet

3.03R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1779 b 3.03 R⊕ Kepler-498 b 3.03 R⊕ Kepler-162 c 3.03 R⊕

Metric	Earth	Kepler-1664 b	Jupiter
Radius (R⊕)	1.00	3.03	11.21
Mass (M⊕)	1.00	9.45	317.83
Density (g/cm³)	5.51	1.86	1.33
Surface Gravity (g)	1.00	1.03	2.53
Insolation (S⊕)	1.00	85.46	0.037

Star Catalogue Identifiers

TIC

TIC 399860388

Gaia DR2

Gaia DR2 2131313444027771520

System

Kepler-1664

Percentile among Sub-Neptune cohort

Radius 3.033 R⊕ · percentile 75 / cohort 1978

Mass 9.450 M⊕ · percentile 69 / cohort 1978

Orbital period 14.39 d · percentile 49 / cohort 1946

Distance 626.69 pc · percentile 55 / cohort 1975

ESI 0.303 · percentile 28 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

14.387 days

Semi-major axis

0.1137 AU

Eccentricity

0.000

Inclination

89.98 °

Year Length

A year here lasts approximately 14.39 Earth days (3.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1137 AU.

Transit Fingerprint

Depth

0.057 %

Duration

2.142 h

Impact parameter b

0.161

Rp / R★

0.021986

Transit midpoint (BJD)

2,455,003.4550

Photometric dip

Transit produces a flux drop of 570 ppm lasting ≈ 2.14 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021986

Semi-major axis / stellar radius

52.421

Impact parameter (b)

0.161

Transit mid-time (BJD)

2,455,003.4550

Angular separation (arcsec)

0.18100

Eq. Temperature

776K

(503 °C)

Insolation (S⊕)

85.46

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

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-1664

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,736 K — cooler than the Sun (5,778 K)

Estimated Age

8.20 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.072 R☉

Stellar Mass

0.944 M☉

Metallicity [Fe/H]

0.37

Extended Stellar Properties

Surface gravity (log g)

4.353 dex

Stellar density

12.223 g/cm³

Metallicity ratio

[M/H]

Distance

626.69 parsec

Light-years 2,043.99 ly

V-band magnitude

13.62 mag

Voyager-speed travel 36,045,767 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Total Proper Motion

4.403 mas/yr

PM Right Ascension

3.75 mas/yr

PM Declination

-2.31 mas/yr

Galactic Cartesian (pc)

x = 0.189 · y = -0.625 · z = 0.758

Equatorial (J2000)

RA 286.85272° · Dec 49.26167°

Galactic ℓ, b

79.806° · 17.761°

Ecliptic λ, β

304.853° · 70.668°

HTM-20 index

673857626