Key parameters at a glance
- A radius of 2.65 Earth radii
- A mass of 7.50 Earth masses
- Surface gravity around 1.07 g
- An orbital period of 22.133 days
- Semi-major axis 0.1416 AU
- Equilibrium temperature 507 K (234 °C)
- Distance from Earth 2,927.57 light-years
- Earth Similarity Index 0.480
- Travel time at Voyager 1 speed 51,627,632 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1822 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#957of 1978
top 48.3%
This planet
2.65R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1822 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.65 | 11.21 |
| Mass (M⊕) | 1.00 | 7.50 | 317.83 |
| Density (g/cm³) | 5.51 | 2.22 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.07 | 2.53 |
| Insolation (S⊕) | 1.00 | 15.65 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 169177842
Gaia DR2
Gaia DR2 2076881364987303296
Gaia DR3
Gaia DR3 2076881364987303296
System
Kepler-1822
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 22.13 Earth days (6.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1416 AU.
Transit Fingerprint
Depth
0.065 %
Duration
2.020 h
Impact parameter b
0.025
Rp / R★
0.022996
Transit midpoint (BJD)
2,454,985.1837
Photometric dip
Transit produces a flux drop of 655 ppm lasting ≈ 2.02 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022996
Semi-major axis / stellar radius
84.400
Impact parameter (b)
0.025
Transit mid-time (BJD)
2,454,985.1837
Angular separation (arcsec)
0.15800
Eq. Temperature
507K
(234 °C)
Insolation (S⊕)
15.65
Earth = 1.00
Earth Similarity (ESI)
0.480
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Valizadegan et al. 2022Instrument
Kepler CCD Array
Publication
2022-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Kepler (12 shown).
Host System: Kepler-1822
Spectral Class
K-type orange
Effective Temperature
5,165 K — cooler than the Sun (5,778 K)
Estimated Age
0.80 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.702 R☉
Stellar Mass
0.782 M☉
Metallicity [Fe/H]
-0.32
Extended Stellar Properties
Surface gravity (log g)
4.633 dex
Stellar density
23.211 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.087 mas
Total Proper Motion
7.615 mas/yr
PM Right Ascension
1.74 mas/yr
PM Declination
-7.41 mas/yr
Galactic Cartesian (pc)
x = 0.344 · y = -0.668 · z = 0.660
Equatorial (J2000)
RA 297.28550° · Dec 41.30557°
Galactic ℓ, b
75.694° · 7.725°
Ecliptic λ, β
314.534° · 60.595°
HTM-20 index
-981743376
Similar Worlds
K2-165 d
Sub-Neptune · K-type orange
Radius 2.65 R⊕ · 439.0 ly
HD 39194 c
Sub-Neptune · K-type orange
Radius 2.65 R⊕ · 86.1 ly
TOI-277 b
Sub-Neptune · K-type orange
Radius 2.65 R⊕ · 210.9 ly
K2-212 b
Sub-Neptune · K-type orange
Radius 2.65 R⊕ · 356.2 ly
TOI-1064 c
Sub-Neptune · K-type orange
Radius 2.65 R⊕ · 222.0 ly
Kepler-721 b
Sub-Neptune · K-type orange
Radius 2.64 R⊕ · 3,022.2 ly