Key parameters at a glance

A radius of 2.60 Earth radii
A mass of 7.27 Earth masses
Surface gravity around 1.08 g
An orbital period of 4.997 days
Semi-major axis 0.0559 AU
Equilibrium temperature 917 K (644 °C)
Distance from Earth 3,467.33 light-years
Earth Similarity Index 0.270
Travel time at Voyager 1 speed 61,146,393 years

Kepler-663 b Planet Profile

Physical Specs

Radius

2.60 R⊕

Radius (Jupiter)

0.232 R♃

Mass

7.27 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.27 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.270

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

#1017of 1978

top 51.4%

This planet

2.60R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-155 c 2.60 R⊕ Kepler-84 e 2.60 R⊕ Kepler-115 c 2.60 R⊕

Metric	Earth	Kepler-663 b	Jupiter
Radius (R⊕)	1.00	2.60	11.21
Mass (M⊕)	1.00	7.27	317.83
Density (g/cm³)	5.51	2.27	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	167.98	0.037

Star Catalogue Identifiers

TIC

TIC 273681023

Gaia DR2

Gaia DR2 2086507280048687488

Gaia DR3

Gaia DR3 2086507280048687488

System

Kepler-663

Percentile among Sub-Neptune cohort

Radius 2.600 R⊕ · percentile 48 / cohort 1978

Mass 7.270 M⊕ · percentile 44 / cohort 1978

Orbital period 5.00 d · percentile 12 / cohort 1946

Distance 1,063.09 pc · percentile 82 / cohort 1975

ESI 0.270 · percentile 21 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

4.997 days

Semi-major axis

0.0559 AU

Eccentricity

0.000

Inclination

86.90 °

Year Length

A year here lasts approximately 5.00 Earth days (1.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0559 AU.

Transit Fingerprint

Depth

0.093 %

Duration

2.090 h

Impact parameter b

0.308

Rp / R★

0.029179

Transit midpoint (BJD)

2,455,004.7416

Photometric dip

Transit produces a flux drop of 935 ppm lasting ≈ 2.09 h.

Extended Orbital Architecture

Planet / star radius ratio

0.029179

Semi-major axis / stellar radius

17.950

Impact parameter (b)

0.308

Transit mid-time (BJD)

2,455,004.7416

Angular separation (arcsec)

0.05260

Eq. Temperature

917K

(644 °C)

Insolation (S⊕)

167.98

Earth = 1.00

Earth Similarity (ESI)

0.270

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

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-663

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,264 K — cooler than the Sun (5,778 K)

Estimated Age

4.57 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.820 R☉

Stellar Mass

0.860 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.550 dex

Stellar density

4.379 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,063.09 parsec

Light-years 3,467.33 ly

V-band magnitude

15.88 mag

Voyager-speed travel 61,146,393 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.913 mas

Total Proper Motion

5.204 mas/yr

PM Right Ascension

0.43 mas/yr

PM Declination

-5.19 mas/yr

Galactic Cartesian (pc)

x = 0.312 · y = -0.592 · z = 0.743

Equatorial (J2000)

RA 297.80822° · Dec 47.94663°

Galactic ℓ, b

81.747° · 10.650°

Ecliptic λ, β

321.534° · 66.480°

HTM-20 index

1169729447