Key parameters at a glance

A radius of 2.14 Earth radii
A mass of 5.22 Earth masses
Surface gravity around 1.14 g
An orbital period of 12.941 days
Semi-major axis 0.1082 AU
Equilibrium temperature 795 K (522 °C)
Distance from Earth 4,294.07 light-years
Earth Similarity Index 0.338
Travel time at Voyager 1 speed 75,725,956 years

Kepler-1212 b Planet Profile

Physical Specs

Radius

2.14 R⊕

Radius (Jupiter)

0.191 R♃

Mass

5.22 M⊕

Mass (Jupiter)

0.016 M♃

Density

2.93 g/cm³

Surface Gravity

1.14 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.338

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1755of 1978

top 88.7%

This planet

2.14R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-437 b 2.14 R⊕ Kepler-813 b 2.14 R⊕ GJ 433 d 2.14 R⊕

Metric	Earth	Kepler-1212 b	Jupiter
Radius (R⊕)	1.00	2.14	11.21
Mass (M⊕)	1.00	5.22	317.83
Density (g/cm³)	5.51	2.93	1.33
Surface Gravity (g)	1.00	1.14	2.53
Insolation (S⊕)	1.00	142.10	0.037

Star Catalogue Identifiers

TIC

TIC 27912642

Gaia DR2

Gaia DR2 2135280378903961984

Gaia DR3

Gaia DR3 2135280378903961984

System

Kepler-1212

Percentile among Sub-Neptune cohort

Radius 2.140 R⊕ · percentile 11 / cohort 1978

Mass 5.220 M⊕ · percentile 12 / cohort 1978

Orbital period 12.94 d · percentile 44 / cohort 1946

Distance 1,316.57 pc · percentile 89 / cohort 1975

ESI 0.338 · percentile 37 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

12.941 days

Semi-major axis

0.1082 AU

Eccentricity

0.000

Inclination

89.93 °

Year Length

A year here lasts approximately 12.94 Earth days (3.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1082 AU.

Transit Fingerprint

Depth

0.033 %

Duration

4.468 h

Impact parameter b

0.028

Rp / R★

0.017257

Transit midpoint (BJD)

2,454,972.8931

Photometric dip

Transit produces a flux drop of 329 ppm lasting ≈ 4.47 h.

Extended Orbital Architecture

Planet / star radius ratio

0.017257

Semi-major axis / stellar radius

21.678

Impact parameter (b)

0.028

Transit mid-time (BJD)

2,454,972.8931

Angular separation (arcsec)

0.08220

Eq. Temperature

795K

(522 °C)

Insolation (S⊕)

142.10

Earth = 1.00

Earth Similarity (ESI)

0.338

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-1212

Spectral Class

F-type yellow-white

Effective Temperature

6,051 K — hotter than the Sun (5,778 K)

Estimated Age

3.24 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.150 R☉

Stellar Mass

1.100 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.360 dex

Stellar density

1.151 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,316.57 parsec

Light-years 4,294.07 ly

V-band magnitude

15.13 mag

Voyager-speed travel 75,725,956 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.731 mas

Total Proper Motion

8.616 mas/yr

PM Right Ascension

-7.29 mas/yr

PM Declination

-4.59 mas/yr

Galactic Cartesian (pc)

x = 0.290 · y = -0.573 · z = 0.766

Equatorial (J2000)

RA 296.85341° · Dec 50.03732°

Galactic ℓ, b

83.318° · 12.196°

Ecliptic λ, β

322.716° · 68.615°

HTM-20 index

-188113070