Key parameters at a glance
- A radius of 10.68 Earth radii
- A mass of 870.85 Earth masses
- Surface gravity around 7.63 g
- An orbital period of 4.723 days
- Semi-major axis 0.0503 AU
- Equilibrium temperature 858 K (585 °C)
- Distance from Earth 748.59 light-years
- Earth Similarity Index 0.214
- Travel time at Voyager 1 speed 13,201,326 years
- Almost certainly tidally locked to its host star given the close orbit
HATS-22 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1709of 1771
top 96.4%
This planet
10.68R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-22 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.68 | 11.21 |
| Mass (M⊕) | 1.00 | 870.85 | 317.83 |
| Density (g/cm³) | 5.51 | 3.89 | 1.33 |
| Surface Gravity (g) | 1.00 | 7.63 | 2.53 |
| Insolation (S⊕) | 1.00 | 111.30 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 870.854 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 14661418
Gaia DR2
Gaia DR2 3483606402800185728
Gaia DR3
Gaia DR3 3483606402800185728
System
HATS-22
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.72 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0503 AU.
Transit Fingerprint
Depth
2.268 %
Duration
2.191 h
Impact parameter b
0.536
Rp / R★
0.142600
Transit midpoint (BJD)
2,457,078.5803
Photometric dip
Transit produces a flux drop of 22,675 ppm lasting ≈ 2.19 h.
Extended Orbital Architecture
Planet / star radius ratio
0.142600
Semi-major axis / stellar radius
15.700
Impact parameter (b)
0.536
RV semi-amplitude (K)
399.000 m/s
Transit mid-time (BJD)
2,457,078.5803
Long. of periastron (ω)
56.00°
Angular separation (arcsec)
0.21900
Eq. Temperature
858K
(585 °C)
Insolation (S⊕)
111.30
Earth = 1.00
Earth Similarity (ESI)
0.214
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.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Bento et al. 2017Instrument
Multiple Instruments
Publication
2017-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2017 at HATSouth (6 shown).
Host System: HATS-22
Spectral Class
K-type orange
Effective Temperature
4,803 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.689 R☉
Stellar Mass
0.759 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.644 dex
Stellar density
3.280 g/cm³
Systemic radial velocity
-7.37 km/s
Rotational v·sin i
0.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
4.328 mas
Total Proper Motion
26.818 mas/yr
PM Right Ascension
24.92 mas/yr
PM Declination
-9.91 mas/yr
Galactic Cartesian (pc)
x = -0.865 · y = 0.091 · z = -0.493
Equatorial (J2000)
RA 174.00987° · Dec -29.54336°
Galactic ℓ, b
283.888° · 30.525°
Ecliptic λ, β
187.426° · -29.243°
HTM-20 index
-1908817806
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