Key parameters at a glance
- A radius of 3.40 Earth radii
- A mass of 11.44 Earth masses
- Surface gravity around 0.99 g
- An orbital period of 10.667 days
- Semi-major axis 0.0910 AU
- Distance from Earth 59.48 light-years
- Earth Similarity Index 0.597
- Travel time at Voyager 1 speed 1,049,016 years
- Almost certainly tidally locked to its host star given the close orbit
GJ 3222 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#221of 1978
top 11.1%
This planet
3.40R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | GJ 3222 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.40 | 11.21 |
| Mass (M⊕) | 1.00 | 11.44 | 317.83 |
| Density (g/cm³) | 5.51 | 1.60 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.99 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 11.442 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 21175
HIP
HIP 15799
TIC
TIC 160004049
System
HIP 15799
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.67 Earth days (2.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0910 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.597
0 = alien, 1 = Earth-identical
Insufficient insolation data. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Feng et al. 2022Instrument
Multiple Instruments
Publication
2022-09
Observation locale
Ground
Discovery cohort
Planets confirmed in 2022 at Multiple Observatories (12 shown).
Host System: GJ 3222
Spectral Class
K-type orange
Effective Temperature
5,257 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.931 R☉
Stellar Mass
0.890 M☉
Metallicity [Fe/H]
0.16
Extended Stellar Properties
Surface gravity (log g)
4.430 dex
Systemic radial velocity
13.40 km/s
Rotational v·sin i
2.00 km/s
Activity index (log R'HK)
-4.680
Metallicity ratio
[M/H]
Multi-band Host Photometry — 10 bands
Astrometric Data
Parallax
54.830 mas
Total Proper Motion
65.668 mas/yr
PM Right Ascension
52.61 mas/yr
PM Declination
39.30 mas/yr
Galactic Cartesian (pc)
x = 0.483 · y = 0.594 · z = -0.644
Equatorial (J2000)
RA 50.89725° · Dec -40.07623°
Galactic ℓ, b
245.241° · -56.092°
Ecliptic λ, β
30.885° · -55.780°
HTM-20 index
540238312
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