Key parameters at a glance

A radius of 2.58 Earth radii
A mass of 7.18 Earth masses
Surface gravity around 1.08 g
An orbital period of 9.878 days
Semi-major axis 0.0932 AU
Equilibrium temperature 1,003 K (730 °C)
Distance from Earth 3,363.68 light-years
Earth Similarity Index 0.246
Travel time at Voyager 1 speed 59,318,484 years

Kepler-1639 b Planet Profile

Physical Specs

Radius

2.58 R⊕

Radius (Jupiter)

0.230 R♃

Mass

7.18 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.30 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.246

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

#1057of 1978

top 53.4%

This planet

2.58R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1018 b 2.58 R⊕ Kepler-169 f 2.58 R⊕ Kepler-461 b 2.58 R⊕

Metric	Earth	Kepler-1639 b	Jupiter
Radius (R⊕)	1.00	2.58	11.21
Mass (M⊕)	1.00	7.18	317.83
Density (g/cm³)	5.51	2.30	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	187.85	0.037

Star Catalogue Identifiers

TIC

TIC 48217852

Gaia DR2

Gaia DR2 2131748472674257280

Gaia DR3

Gaia DR3 2131748472674257280

System

Kepler-1639

Percentile among Sub-Neptune cohort

Radius 2.580 R⊕ · percentile 46 / cohort 1978

Mass 7.180 M⊕ · percentile 43 / cohort 1978

Orbital period 9.88 d · percentile 33 / cohort 1946

Distance 1,031.31 pc · percentile 80 / cohort 1975

ESI 0.246 · percentile 15 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

9.878 days

Semi-major axis

0.0932 AU

Eccentricity

0.000

Inclination

87.70 °

Year Length

A year here lasts approximately 9.88 Earth days (2.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0932 AU.

Transit Fingerprint

Depth

0.045 %

Duration

3.081 h

Impact parameter b

0.093

Rp / R★

0.020026

Transit midpoint (BJD)

2,454,967.4160

Photometric dip

Transit produces a flux drop of 455 ppm lasting ≈ 3.08 h.

Extended Orbital Architecture

Planet / star radius ratio

0.020026

Semi-major axis / stellar radius

18.230

Impact parameter (b)

0.093

Transit mid-time (BJD)

2,454,967.4160

Angular separation (arcsec)

0.09040

Eq. Temperature

1,003K

(730 °C)

Insolation (S⊕)

187.85

Earth = 1.00

Earth Similarity (ESI)

0.246

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-1639

Spectral Class

F-type yellow-white

Effective Temperature

6,150 K — hotter than the Sun (5,778 K)

Estimated Age

3.16 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.180 R☉

Stellar Mass

1.120 M☉

Metallicity [Fe/H]

-0.03

Extended Stellar Properties

Surface gravity (log g)

4.340 dex

Stellar density

2.989 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,031.31 parsec

Light-years 3,363.68 ly

V-band magnitude

14.59 mag

Voyager-speed travel 59,318,484 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.941 mas

Total Proper Motion

7.777 mas/yr

PM Right Ascension

-0.39 mas/yr

PM Declination

7.77 mas/yr

Galactic Cartesian (pc)

x = 0.149 · y = -0.642 · z = 0.752

Equatorial (J2000)

RA 283.06865° · Dec 48.80212°

Galactic ℓ, b

78.453° · 19.935°

Ecliptic λ, β

297.232° · 71.008°

HTM-20 index

1909051411