Key parameters at a glance

A radius of 13.90 Earth radii
A mass of 260.00 Earth masses
Surface gravity around 1.35 g
An orbital period of 258.800 days
Semi-major axis 0.8539 AU
Distance from Earth 990.63 light-years
Earth Similarity Index 0.292
Travel time at Voyager 1 speed 17,469,708 years

3 siblings around Kepler-65

Kepler-65 e shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-65 b	Super-Earth	1.42	2.40	2.155	1,740	2012
Kepler-65 c	Sub-Neptune	2.58	5.40	5.860	1,246	2012
Kepler-65 d	Super-Earth	1.52	4.14	8.131	1,117	2012
Kepler-65 e this	Gas Giant	13.90	260.00	258.800	—	2019

Kepler-65 e Planet Profile

Physical Specs

Radius

13.90 R⊕

Radius (Jupiter)

1.240 R♃

Mass

260.00 M⊕

Mass (Jupiter)

0.820 M♃

Density

0.53 g/cm³

Surface Gravity

1.35 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.292

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#456of 1771

top 25.7%

This planet

13.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

24 Sex c 13.90 R⊕ HD 148156 b 13.90 R⊕ HD 134987 c 13.90 R⊕

Metric	Earth	Kepler-65 e	Jupiter
Radius (R⊕)	1.00	13.90	11.21
Mass (M⊕)	1.00	260.00	317.83
Density (g/cm³)	5.51	0.53	1.33
Surface Gravity (g)	1.00	1.35	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	260.000 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	207.543 M⊕	Lower bound from radial-velocity fitting.
Computed mass	259.872 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

TIC

TIC 121731834

Gaia DR2

Gaia DR2 2102119176929154304

Gaia DR3

Gaia DR3 2102119176929154304

System

Kepler-65

Percentile among Gas Giant cohort

Radius 13.900 R⊕ · percentile 72 / cohort 1771

Mass 260.000 M⊕ · percentile 28 / cohort 1747

Orbital period 258.80 d · percentile 59 / cohort 1533

Distance 303.73 pc · percentile 61 / cohort 1759

ESI 0.292 · percentile 56 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

258.800 days

Semi-major axis

0.8539 AU

Eccentricity

0.283

Inclination

127.00 °

Year Length

A year here lasts approximately 258.80 Earth days (70.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.8539 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.292

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Mills et al. 2019

Instrument

HIRES Spectrometer

Publication

2019-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at W. M. Keck Observatory (3 shown).

HD 125390 b · Gas Giant HD 202696 b · Unclassified HD 202696 c · Unclassified

Host System: Kepler-65

Spectral Class

F-type yellow-white

Effective Temperature

6,220 K — hotter than the Sun (5,778 K)

Estimated Age

3.31 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.437 R☉

Stellar Mass

1.248 M☉

Metallicity [Fe/H]

0.13

Extended Stellar Properties

Surface gravity (log g)

4.232 dex

Stellar density

0.621 g/cm³

Systemic radial velocity

-16.72 km/s

Rotational v·sin i

10.40 km/s

Metallicity ratio

[Fe/H]

Distance

303.73 parsec

Light-years 990.63 ly

V-band magnitude

10.92 mag

Voyager-speed travel 17,469,708 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.264 mas

Total Proper Motion

14.222 mas/yr

PM Right Ascension

0.97 mas/yr

PM Declination

-14.19 mas/yr

Galactic Cartesian (pc)

x = 0.241 · y = -0.713 · z = 0.658

Equatorial (J2000)

RA 288.68872° · Dec 41.15111°

Galactic ℓ, b

72.570° · 13.415°

Ecliptic λ, β

301.565° · 62.557°

HTM-20 index

-1442391783