Key parameters at a glance

A radius of 2.66 Earth radii
A mass of 7.56 Earth masses
Surface gravity around 1.07 g
An orbital period of 2.526 days
Semi-major axis 0.0374 AU
Equilibrium temperature 1,406 K (1133 °C)
Distance from Earth 3,946.88 light-years
Earth Similarity Index 0.167
Travel time at Voyager 1 speed 69,603,207 years

Kepler-664 b Planet Profile

Physical Specs

Radius

2.66 R⊕

Radius (Jupiter)

0.237 R♃

Mass

7.56 M⊕

Mass (Jupiter)

0.024 M♃

Density

2.21 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.167

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

#928of 1978

top 46.9%

This planet

2.66R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-346 b 2.66 R⊕ KOI-351 e 2.66 R⊕ Kepler-1987 d 2.66 R⊕

Metric	Earth	Kepler-664 b	Jupiter
Radius (R⊕)	1.00	2.66	11.21
Mass (M⊕)	1.00	7.56	317.83
Density (g/cm³)	5.51	2.21	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	652.44	0.037

Star Catalogue Identifiers

TIC

TIC 299033092

Gaia DR2

Gaia DR2 2130969262529165184

Gaia DR3

Gaia DR3 2130969262529165184

System

Kepler-664

Percentile among Sub-Neptune cohort

Radius 2.660 R⊕ · percentile 52 / cohort 1978

Mass 7.560 M⊕ · percentile 48 / cohort 1978

Orbital period 2.53 d · percentile 3 / cohort 1946

Distance 1,210.12 pc · percentile 87 / cohort 1975

ESI 0.167 · percentile 3 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

2.526 days

Semi-major axis

0.0374 AU

Eccentricity

0.000

Inclination

85.41 °

Year Length

A year here lasts approximately 2.53 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0374 AU.

Transit Fingerprint

Depth

0.060 %

Duration

1.588 h

Impact parameter b

0.183

Rp / R★

0.023694

Transit midpoint (BJD)

2,455,004.5951

Photometric dip

Transit produces a flux drop of 603 ppm lasting ≈ 1.59 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023694

Semi-major axis / stellar radius

12.250

Impact parameter (b)

0.183

Transit mid-time (BJD)

2,455,004.5951

Angular separation (arcsec)

0.03090

Eq. Temperature

1,406K

(1133 °C)

Insolation (S⊕)

652.44

Earth = 1.00

Earth Similarity (ESI)

0.167

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-664

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,754 K — cooler than the Sun (5,778 K)

Estimated Age

4.68 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.020 R☉

Stellar Mass

1.010 M☉

Metallicity [Fe/H]

0.07

Extended Stellar Properties

Surface gravity (log g)

4.430 dex

Stellar density

5.453 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,210.12 parsec

Light-years 3,946.88 ly

V-band magnitude

15.66 mag

Voyager-speed travel 69,603,207 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.798 mas

Total Proper Motion

3.407 mas/yr

PM Right Ascension

1.46 mas/yr

PM Declination

3.08 mas/yr

Galactic Cartesian (pc)

x = 0.214 · y = -0.631 · z = 0.746

Equatorial (J2000)

RA 288.75490° · Dec 48.22620°

Galactic ℓ, b

79.294° · 16.210°

Ecliptic λ, β

307.204° · 69.255°

HTM-20 index

280159291