Key parameters at a glance

A radius of 1.75 Earth radii
A mass of 36.00 Earth masses
Surface gravity around 11.76 g
An orbital period of 56.268 days
Semi-major axis 0.2858 AU
Equilibrium temperature 543 K (270 °C)
Distance from Earth 3,351.09 light-years
Earth Similarity Index 0.334
Travel time at Voyager 1 speed 59,096,466 years

4 siblings around Kepler-122

Kepler-122 f shares its host star with 4 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-122 b	Sub-Neptune	2.34	6.08	5.766	1,159	2014
Kepler-122 c	Neptune-like	5.87	29.00	12.466	897	2014
Kepler-122 d	Sub-Neptune	2.20	5.48	21.587	747	2014
Kepler-122 e	Sub-Neptune	2.60	27.70	37.993	618	2014
Kepler-122 f this	Super-Earth	1.75	36.00	56.268	543	2014

Kepler-122 f Planet Profile

Physical Specs

Radius

1.75 R⊕

Radius (Jupiter)

0.156 R♃

Mass

36.00 M⊕

Mass (Jupiter)

0.113 M♃

Density

36.90 g/cm³

Surface Gravity

11.76 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.334

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit Timing Variations

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#326of 1176

top 27.6%

This planet

1.75R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-403 c 1.75 R⊕ Kepler-301 d 1.75 R⊕ Kepler-1243 b 1.75 R⊕

Metric	Earth	Kepler-122 f	Jupiter
Radius (R⊕)	1.00	1.75	11.21
Mass (M⊕)	1.00	36.00	317.83
Density (g/cm³)	5.51	36.90	1.33
Surface Gravity (g)	1.00	11.76	2.53
Insolation (S⊕)	1.00	21.52	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	36.000 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 122714267

Gaia DR2

Gaia DR2 2053070616052194304

Gaia DR3

Gaia DR3 2053070616052194304

System

Kepler-122

Percentile among Super-Earth cohort

Radius 1.750 R⊕ · percentile 71 / cohort 1176

Mass 36.000 M⊕ · percentile 98 / cohort 1176

Orbital period 56.27 d · percentile 97 / cohort 1164

Distance 1,027.45 pc · percentile 82 / cohort 1171

ESI 0.334 · percentile 46 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

56.268 days

Semi-major axis

0.2858 AU

Eccentricity

0.000

Inclination

89.97 °

Year Length

A year here lasts approximately 56.27 Earth days (15.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2858 AU.

Transit Fingerprint

Depth

0.035 %

Duration

8.114 h

Impact parameter b

0.467

Rp / R★

0.017091

Transit midpoint (BJD)

2,454,997.2199

Photometric dip

Transit produces a flux drop of 349 ppm lasting ≈ 8.11 h.

Extended Orbital Architecture

Planet / star radius ratio

0.017091

Semi-major axis / stellar radius

53.860

Impact parameter (b)

0.467

Transit mid-time (BJD)

2,454,997.2199

Angular separation (arcsec)

0.27800

Eq. Temperature

543K

(270 °C)

Insolation (S⊕)

21.52

Earth = 1.00

Earth Similarity (ESI)

0.334

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Hadden et al. 2014

Instrument

Kepler CCD Array

Publication

2014-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-122

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,917 K — hotter than the Sun (5,778 K)

Estimated Age

7.94 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.949 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

-0.08

Extended Stellar Properties

Surface gravity (log g)

4.350 dex

Stellar density

0.530 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,027.45 parsec

Light-years 3,351.09 ly

V-band magnitude

14.40 mag

Voyager-speed travel 59,096,466 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.945 mas

Total Proper Motion

7.687 mas/yr

PM Right Ascension

-2.88 mas/yr

PM Declination

-7.13 mas/yr

Galactic Cartesian (pc)

x = 0.276 · y = -0.715 · z = 0.642

Equatorial (J2000)

RA 291.11186° · Dec 39.94902°

Galactic ℓ, b

72.262° · 11.237°

Ecliptic λ, β

304.565° · 60.879°

HTM-20 index

1565371838