Key parameters at a glance

A radius of 10.00 Earth radii
A mass of 71.90 Earth masses
Surface gravity around 0.72 g
An orbital period of 122.400 days
Semi-major axis 0.4164 AU
Distance from Earth 793.37 light-years
Earth Similarity Index 0.306
Travel time at Voyager 1 speed 13,991,100 years

2 siblings around Kepler-25

Kepler-25 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
Kepler-25 b	Sub-Neptune	2.75	8.70	6.238	1,185	2011
Kepler-25 c	Neptune-like	5.22	15.20	12.721	934	2011
Kepler-25 d this	Gas Giant	10.00	71.90	122.400	—	2014

Kepler-25 d Planet Profile

Physical Specs

Radius

10.00 R⊕

Radius (Jupiter)

0.894 R♃

Mass

71.90 M⊕

Mass (Jupiter)

0.226 M♃

Density

0.40 g/cm³

Surface Gravity

0.72 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.306

HZ Position Unknown

Controversial No

Discovery

Year 2014

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#1770of 1771

top 99.9%

This planet

10.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 46375 b 10.00 R⊕ K2-295 b 10.05 R⊕ HAT-P-61 b 10.08 R⊕

Metric	Earth	Kepler-25 d	Jupiter
Radius (R⊕)	1.00	10.00	11.21
Mass (M⊕)	1.00	71.90	317.83
Density (g/cm³)	5.51	0.40	1.33
Surface Gravity (g)	1.00	0.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	71.900 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	71.830 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 120960812

Gaia DR2

Gaia DR2 2100451630105041152

Gaia DR3

Gaia DR3 2100451630105041152

System

Kepler-25

Percentile among Gas Giant cohort

Radius 10.000 R⊕ · percentile 0 / cohort 1771

Mass 71.900 M⊕ · percentile 1 / cohort 1747

Orbital period 122.40 d · percentile 54 / cohort 1533

Distance 243.25 pc · percentile 55 / cohort 1759

ESI 0.306 · percentile 60 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

122.400 days

Semi-major axis

0.4164 AU

Eccentricity

0.130

Inclination

— °

Year Length

A year here lasts approximately 122.40 Earth days (33.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.4164 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.306

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Marcy et al. 2014

Instrument

HIRES Spectrometer

Publication

2014-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2014 at W. M. Keck Observatory (11 shown).

HAT-P-44 c · Gas Giant Kepler-94 c · Gas Giant HD 4203 c · Gas Giant Kepler-48 e · Gas Giant Kepler-407 c · Gas Giant HD 10442 b · Gas Giant HD 5319 c · Gas Giant GJ 849 c · Gas Giant HD 75784 b · Gas Giant Kepler-93 c · Unclassified Kepler-97 c · Unclassified

Host System: Kepler-25

Spectral Class

F-type yellow-white

Effective Temperature

6,354 K — hotter than the Sun (5,778 K)

Estimated Age

2.75 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.316 R☉

Stellar Mass

1.165 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.285 dex

Stellar density

0.750 g/cm³

Systemic radial velocity

-7.59 km/s

Rotational v·sin i

9.34 km/s

Metallicity ratio

[Fe/H]

Distance

243.25 parsec

Light-years 793.37 ly

V-band magnitude

10.77 mag

Voyager-speed travel 13,991,100 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

4.082 mas

Total Proper Motion

6.186 mas/yr

PM Right Ascension

-0.45 mas/yr

PM Declination

6.17 mas/yr

Galactic Cartesian (pc)

x = 0.221 · y = -0.739 · z = 0.636

Equatorial (J2000)

RA 286.63839° · Dec 39.48790°

Galactic ℓ, b

70.350° · 14.164°

Ecliptic λ, β

297.442° · 61.351°

HTM-20 index

-747501211