Key parameters at a glance

A radius of 1.77 Earth radii
A mass of 3.78 Earth masses
Surface gravity around 1.21 g
An orbital period of 3.223 days
Semi-major axis 0.0408 AU
Equilibrium temperature 1,239 K (966 °C)
Distance from Earth 2,806.22 light-years
Earth Similarity Index 0.223
Travel time at Voyager 1 speed 49,487,632 years

Kepler-822 b Planet Profile

Physical Specs

Radius

1.77 R⊕

Radius (Jupiter)

0.158 R♃

Mass

3.78 M⊕

Mass (Jupiter)

0.012 M♃

Density

3.75 g/cm³

Surface Gravity

1.21 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.223

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

#293of 1176

top 24.8%

This planet

1.77R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

GJ 667 C c 1.77 R⊕ Kepler-286 e 1.77 R⊕ Kepler-215 c 1.77 R⊕

Metric	Earth	Kepler-822 b	Jupiter
Radius (R⊕)	1.00	1.77	11.21
Mass (M⊕)	1.00	3.78	317.83
Density (g/cm³)	5.51	3.75	1.33
Surface Gravity (g)	1.00	1.21	2.53
Insolation (S⊕)	1.00	535.19	0.037

Star Catalogue Identifiers

TIC

TIC 137552781

Gaia DR2

Gaia DR2 2053165655089863808

Gaia DR3

Gaia DR3 2053165655089863808

System

Kepler-822

Percentile among Super-Earth cohort

Radius 1.770 R⊕ · percentile 73 / cohort 1176

Mass 3.780 M⊕ · percentile 67 / cohort 1176

Orbital period 3.22 d · percentile 24 / cohort 1164

Distance 860.39 pc · percentile 73 / cohort 1171

ESI 0.223 · percentile 18 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

3.223 days

Semi-major axis

0.0408 AU

Eccentricity

0.000

Inclination

87.67 °

Year Length

A year here lasts approximately 3.22 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0408 AU.

Transit Fingerprint

Depth

0.023 %

Duration

2.858 h

Impact parameter b

0.035

Rp / R★

0.014501

Transit midpoint (BJD)

2,455,011.0721

Photometric dip

Transit produces a flux drop of 233 ppm lasting ≈ 2.86 h.

Extended Orbital Architecture

Planet / star radius ratio

0.014501

Semi-major axis / stellar radius

8.756

Impact parameter (b)

0.035

Transit mid-time (BJD)

2,455,011.0721

Angular separation (arcsec)

0.04740

Eq. Temperature

1,239K

(966 °C)

Insolation (S⊕)

535.19

Earth = 1.00

Earth Similarity (ESI)

0.223

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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-822

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,928 K — hotter than the Sun (5,778 K)

Estimated Age

3.55 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.080 R☉

Stellar Mass

1.060 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

4.400 dex

Stellar density

1.000 g/cm³

Metallicity ratio

[Fe/H]

Distance

860.39 parsec

Light-years 2,806.22 ly

V-band magnitude

14.75 mag

Voyager-speed travel 49,487,632 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.134 mas

Total Proper Motion

11.497 mas/yr

PM Right Ascension

-3.94 mas/yr

PM Declination

-10.80 mas/yr

Galactic Cartesian (pc)

x = 0.292 · y = -0.714 · z = 0.637

Equatorial (J2000)

RA 292.27609° · Dec 39.55011°

Galactic ℓ, b

72.305° · 10.257°

Ecliptic λ, β

306.060° · 60.231°

HTM-20 index

1679868591