Key parameters at a glance

A radius of 14.00 Earth radii
A mass of 126.40 Earth masses
Surface gravity around 0.64 g
An orbital period of 1,919.000 days
Semi-major axis 3.0530 AU
Distance from Earth 606.24 light-years
Earth Similarity Index 0.244
Travel time at Voyager 1 speed 10,691,085 years

1 sibling around Kepler-1656

Kepler-1656 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-1656 b	Neptune-like	4.57	47.80	31.562	651	2018
Kepler-1656 c this	Gas Giant	14.00	126.40	1,919.000	—	2022

Kepler-1656 c Planet Profile

Physical Specs

Radius

14.00 R⊕

Radius (Jupiter)

1.250 R♃

Mass

126.40 M⊕

Mass (Jupiter)

0.400 M♃

Density

0.25 g/cm³

Surface Gravity

0.64 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.244

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#415of 1771

top 23.4%

This planet

14.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 9446 b 14.00 R⊕ HD 156411 b 14.00 R⊕ HD 224693 b 14.00 R⊕

Metric	Earth	Kepler-1656 c	Jupiter
Radius (R⊕)	1.00	14.00	11.21
Mass (M⊕)	1.00	126.40	317.83
Density (g/cm³)	5.51	0.25	1.33
Surface Gravity (g)	1.00	0.64	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	126.400 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	107.200 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 120255950

Gaia DR2

Gaia DR2 2103392720630278656

Gaia DR3

Gaia DR3 2103392720630278656

System

Kepler-1656

Percentile among Gas Giant cohort

Radius 14.000 R⊕ · percentile 74 / cohort 1771

Mass 126.400 M⊕ · percentile 9 / cohort 1747

Orbital period 1,919.00 d · percentile 84 / cohort 1533

Distance 185.88 pc · percentile 48 / cohort 1759

ESI 0.244 · percentile 42 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,919.000 days

Semi-major axis

3.0530 AU

Eccentricity

0.527

Inclination

— °

Year Length

A year here lasts about 5.25 Earth years on a highly eccentric trajectory at a mean orbital distance of 3.0530 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

6.350 m/s

Transit mid-time (BJD)

2,459,461.0000

Long. of periastron (ω)

87.70°

Angular separation (arcsec)

16.40000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.244

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Angelo et al. 2022

Instrument

HIRES Spectrometer

Publication

2022-05

Observation locale

Ground

Discovery cohort

Planets confirmed in 2022 at W. M. Keck Observatory (3 shown).

HD 191939 e · Gas Giant TOI-1272 c · Neptune-like HD 191939 f · Gas Giant

Host System: Kepler-1656

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,569 K — cooler than the Sun (5,778 K)

Estimated Age

6.31 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.100 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.19

Extended Stellar Properties

Surface gravity (log g)

4.400 dex

Stellar density

1.050 g/cm³

Systemic radial velocity

-39.29 km/s

Rotational v·sin i

2.80 km/s

Metallicity ratio

[Fe/H]

Distance

185.88 parsec

Light-years 606.24 ly

V-band magnitude

11.64 mag

Voyager-speed travel 10,691,085 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

5.351 mas

Total Proper Motion

20.615 mas/yr

PM Right Ascension

10.87 mas/yr

PM Declination

17.52 mas/yr

Galactic Cartesian (pc)

x = 0.192 · y = -0.743 · z = 0.642

Equatorial (J2000)

RA 284.47225° · Dec 39.91189°

Galactic ℓ, b

70.079° · 15.864°

Ecliptic λ, β

294.213° · 62.140°

HTM-20 index

-448263849