Key parameters at a glance
- A radius of 12.80 Earth radii
- A mass of 1,649.53 Earth masses
- Surface gravity around 10.07 g
- An orbital period of 14,892.000 days
- Semi-major axis 10.8000 AU
- Distance from Earth 37.33 light-years
- Earth Similarity Index 0.433
- Travel time at Voyager 1 speed 658,398 years
HD 222237 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1063of 1771
top 60.0%
This planet
12.80R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 222237 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.80 | 11.21 |
| Mass (M⊕) | 1.00 | 1,649.53 | 317.83 |
| Density (g/cm³) | 5.51 | 4.32 | 1.33 |
| Surface Gravity (g) | 1.00 | 10.07 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,649.529 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 222237
HIP
HIP 116745
TIC
TIC 277913391
Gaia DR2
Gaia DR2 6380214844952702848
Gaia DR3
Gaia DR3 6380214844952702848
System
HD 222237
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 40.77 Earth years on a highly eccentric trajectory at a mean orbital distance of 10.8000 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.433
0 = alien, 1 = Earth-identical
Detection Signatures
Radial velocity
Stellar wobble has been measured spectroscopically.
Astrometry
Positional wobble of the host star was measured.
Discovery Paper
Primary reference
Xiao et al. 2024Instrument
Multiple Instruments
Publication
2024-09
Observation locale
Ground
Discovery cohort
Planets confirmed in 2024 at Multiple Observatories (12 shown).
Host System: HD 222237
Spectral Class
K-type orange
Effective Temperature
4,751 K — cooler than the Sun (5,778 K)
Estimated Age
8.80 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.710 R☉
Stellar Mass
0.760 M☉
Metallicity [Fe/H]
-0.32
Extended Stellar Properties
Surface gravity (log g)
4.610 dex
Stellar density
3.001 g/cm³
Systemic radial velocity
69.20 km/s
Rotational v·sin i
2.40 km/s
Activity index (log R'HK)
-4.860
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 8 bands
Astrometric Data
Parallax
87.331 mas
Total Proper Motion
750.678 mas/yr
PM Right Ascension
143.79 mas/yr
PM Declination
-736.78 mas/yr
Galactic Cartesian (pc)
x = 0.296 · y = -0.026 · z = -0.955
Equatorial (J2000)
RA 354.90786° · Dec -72.72533°
Galactic ℓ, b
310.166° · -43.380°
Ecliptic λ, β
306.204° · -59.953°
HTM-20 index
-1535602887
Similar Worlds
HD 99706 c
Gas Giant · K-type orange
Radius 12.80 R⊕ · 478.1 ly
HD 135872 b
Gas Giant · K-type orange
Radius 12.80 R⊕ · 268.8 ly
WASP-132 d
Gas Giant · K-type orange
Radius 12.80 R⊕ · 400.9 ly
gam Lib c
Gas Giant · K-type orange
Radius 12.80 R⊕ · 154.6 ly
HD 240210 b
Gas Giant · K-type orange
Radius 12.80 R⊕ · 1,214.6 ly
WISPIT 1 c
Gas Giant · K-type orange
Radius 12.80 R⊕ · 750.2 ly