Key parameters at a glance

A radius of 13.10 Earth radii
A mass of 965.15 Earth masses
Surface gravity around 5.62 g
An orbital period of 1,403.000 days
Semi-major axis 2.4663 AU
Distance from Earth 1,229.16 light-years
Earth Similarity Index 0.399
Travel time at Voyager 1 speed 21,676,258 years

2 siblings around KOI-142

Kepler-88 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
KOI-142 b	Sub-Neptune	3.44	9.50	10.916	758	2013
KOI-142 c	Gas Giant	14.00	214.10	22.265	—	2013
Kepler-88 d this	Gas Giant	13.10	965.15	1,403.000	—	2020

Kepler-88 d Planet Profile

Physical Specs

Radius

13.10 R⊕

Radius (Jupiter)

1.170 R♃

Mass

965.15 M⊕

Mass (Jupiter)

3.050 M♃

Density

2.36 g/cm³

Surface Gravity

5.62 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.399

HZ Position Unknown

Controversial No

Discovery

Year 2020

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#910of 1771

top 51.3%

This planet

13.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

GJ 3021 b 13.10 R⊕ HD 221287 b 13.10 R⊕ HD 37605 c 13.10 R⊕

Metric	Earth	Kepler-88 d	Jupiter
Radius (R⊕)	1.00	13.10	11.21
Mass (M⊕)	1.00	965.15	317.83
Density (g/cm³)	5.51	2.36	1.33
Surface Gravity (g)	1.00	5.62	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	965.000 M⊕	Lower bound from radial-velocity fitting.
Computed mass	965.147 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

TIC

TIC 122712595

Gaia DR2

Gaia DR2 2101507367429089664

Gaia DR3

Gaia DR3 2101507367429089664

System

KOI-142

Percentile among Gas Giant cohort

Radius 13.100 R⊕ · percentile 46 / cohort 1771

Mass 965.147 M⊕ · percentile 66 / cohort 1747

Orbital period 1,403.00 d · percentile 81 / cohort 1533

Distance 376.86 pc · percentile 67 / cohort 1759

ESI 0.399 · percentile 85 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,403.000 days

Semi-major axis

2.4663 AU

Eccentricity

0.410

Inclination

89.00 °

Year Length

A year here lasts about 3.84 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.4663 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.399

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Weiss et al. 2020

Instrument

HIRES Spectrometer

Publication

2020-05

Observation locale

Ground

Host System: KOI-142

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,466 K — cooler than the Sun (5,778 K)

Estimated Age

1.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.897 R☉

Stellar Mass

0.990 M☉

Metallicity [Fe/H]

0.27

Extended Stellar Properties

Surface gravity (log g)

4.528 dex

Stellar density

1.340 g/cm³

Systemic radial velocity

-20.45 km/s

Rotational v·sin i

1.80 km/s

Metallicity ratio

[Fe/H]

Distance

376.86 parsec

Light-years 1,229.16 ly

V-band magnitude

13.21 mag

Voyager-speed travel 21,676,258 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.625 mas

Total Proper Motion

5.086 mas/yr

PM Right Ascension

1.11 mas/yr

PM Declination

4.96 mas/yr

Galactic Cartesian (pc)

x = 0.274 · y = -0.707 · z = 0.652

Equatorial (J2000)

RA 291.14810° · Dec 40.66941°

Galactic ℓ, b

72.935° · 11.528°

Ecliptic λ, β

305.066° · 61.559°

HTM-20 index

1617973644