Key parameters at a glance

A radius of 6.06 Earth radii
A mass of 30.60 Earth masses
Surface gravity around 0.83 g
An orbital period of 287.379 days
Semi-major axis 0.8776 AU
Equilibrium temperature 350 K (77 °C)
Distance from Earth 7,534.56 light-years
Earth Similarity Index 0.455
Travel time at Voyager 1 speed 132,872,000 years

Context from the literature

Kepler-1625b is a super-Jupiter exoplanet orbiting the Sun-like star Kepler-1625 about 2,500 parsecs away in the constellation of Cygnus. The large gas giant is approximately the same radius as Jupiter, and orbits its star every 287.4 days. In 2017, hints of a Neptune-sized exomoon in orbit of the planet were found using photometric observations collected by the Kepler Mission. Further evidence for a Neptunian moon was found the following year using the Hubble Space Telescope, where two independent lines of evidence constrained the mass and radius to be Neptune-like. The mass-signature has been independently recovered by two other teams. However, the radius-signature was independently recovered by one of the teams but not the other. The original discovery team later showed that this latter study appears affected by systematic error sources that may have influenced its findings.

Excerpted from Wikipedia · full article

Kepler-1625 b Planet Profile

Physical Specs

Radius

6.06 R⊕

Radius (Jupiter)

0.541 R♃

Mass

30.60 M⊕

Mass (Jupiter)

0.096 M♃

Density

0.76 g/cm³

Surface Gravity

0.83 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.455

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

#279of 574

top 48.4%

This planet

6.06R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-2498 b 6.06 R⊕ HD 34445 d 6.07 R⊕ Kepler-497 b 6.04 R⊕

Metric	Earth	Kepler-1625 b	Jupiter
Radius (R⊕)	1.00	6.06	11.21
Mass (M⊕)	1.00	30.60	317.83
Density (g/cm³)	5.51	0.76	1.33
Surface Gravity (g)	1.00	0.83	2.53
Insolation (S⊕)	1.00	3.30	0.037

Star Catalogue Identifiers

TIC

TIC 184011870

Gaia DR2

Gaia DR2 2076280000851171328

Gaia DR3

Gaia DR3 2076280000851171328

System

Kepler-1625

Percentile among Neptune-like cohort

Radius 6.060 R⊕ · percentile 51 / cohort 574

Mass 30.600 M⊕ · percentile 51 / cohort 574

Orbital period 287.38 d · percentile 93 / cohort 524

Distance 2,310.11 pc · percentile 91 / cohort 572

ESI 0.455 · percentile 82 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

287.379 days

Semi-major axis

0.8776 AU

Eccentricity

0.000

Inclination

89.99 °

Year Length

A year here lasts approximately 287.38 Earth days (78.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.8776 AU.

Transit Fingerprint

Depth

0.438 %

Duration

18.886 h

Impact parameter b

0.036

Rp / R★

0.059000

Transit midpoint (BJD)

2,455,181.8298

Photometric dip

Transit produces a flux drop of 4,377 ppm lasting ≈ 18.89 h.

Extended Orbital Architecture

Planet / star radius ratio

0.059000

Semi-major axis / stellar radius

123.030

Impact parameter (b)

0.036

Transit mid-time (BJD)

2,455,181.8298

Angular separation (arcsec)

0.38000

Eq. Temperature

350K

(77 °C)

Insolation (S⊕)

3.30

Earth = 1.00

Earth Similarity (ESI)

0.455

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.

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-1625

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,677 K — cooler than the Sun (5,778 K)

Estimated Age

4.37 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.940 R☉

Stellar Mass

0.960 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.480 dex

Stellar density

0.432 g/cm³

Metallicity ratio

[Fe/H]

Distance

2,310.11 parsec

Light-years 7,534.56 ly

V-band magnitude

16.23 mag

Voyager-speed travel 132,872,000 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.406 mas

Total Proper Motion

5.257 mas/yr

PM Right Ascension

-2.15 mas/yr

PM Declination

-4.80 mas/yr

Galactic Cartesian (pc)

x = 0.329 · y = -0.693 · z = 0.641

Equatorial (J2000)

RA 295.42932° · Dec 39.88651°

Galactic ℓ, b

73.750° · 8.267°

Ecliptic λ, β

310.871° · 59.769°

HTM-20 index

-1218591788

Wikipedia → Image: Wikimedia Commons · CaptSalamanca · CC BY 4.0