Key parameters at a glance
- A radius of 12.89 Earth radii
- A mass of 785.04 Earth masses
- Surface gravity around 4.72 g
- An orbital period of 3.212 days
- Semi-major axis 0.0414 AU
- Equilibrium temperature 1,463 K (1190 °C)
- Distance from Earth 266.68 light-years
- Earth Similarity Index 0.106
- Travel time at Voyager 1 speed 4,702,910 years
HAT-P-22 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1049of 1771
top 59.2%
This planet
12.89R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HAT-P-22 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.89 | 11.21 |
| Mass (M⊕) | 1.00 | 785.04 | 317.83 |
| Density (g/cm³) | 5.51 | 2.14 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.72 | 2.53 |
| Insolation (S⊕) | 1.00 | 325.57 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 785.040 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 233731
TIC
TIC 252479260
Gaia DR2
Gaia DR2 846946629987527168
Gaia DR3
Gaia DR3 846946629987527168
System
HAT-P-22
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.21 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0414 AU.
Transit Fingerprint
Depth
1.100 %
Duration
2.653 h
Impact parameter b
0.466
Rp / R★
0.106500
Transit midpoint (BJD)
2,458,261.3060
Photometric dip
Transit produces a flux drop of 11,000 ppm lasting ≈ 2.65 h.
Extended Orbital Architecture
Planet / star radius ratio
0.106500
Semi-major axis / stellar radius
8.580
Impact parameter (b)
0.466
RV semi-amplitude (K)
313.300 m/s
Transit mid-time (BJD)
2,458,261.3060
Long. of periastron (ω)
156.00°
Sky-projected obliquity (λ)
-2.10°
True obliquity (ψ)
24.00°
Angular separation (arcsec)
0.50600
Eq. Temperature
1,463K
(1190 °C)
Insolation (S⊕)
325.57
Earth = 1.00
Earth Similarity (ESI)
0.106
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Bakos et al. 2010Instrument
2K CCD Sensor
Publication
2011-12
Observation locale
Ground
Discovery cohort
Planets confirmed in 2010 at HATNet (12 shown).
Host System: HAT-P-22
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,302 K — cooler than the Sun (5,778 K)
Estimated Age
12.40 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.110 R☉
Stellar Mass
1.130 M☉
Metallicity [Fe/H]
0.24
Extended Stellar Properties
Surface gravity (log g)
4.360 dex
Stellar density
1.160 g/cm³
Systemic radial velocity
12.64 km/s
Rotational v·sin i
0.50 km/s
Rotation period
28.70 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
12.201 mas
Total Proper Motion
87.725 mas/yr
PM Right Ascension
-26.18 mas/yr
PM Declination
83.73 mas/yr
Galactic Cartesian (pc)
x = -0.584 · y = 0.264 · z = 0.767
Equatorial (J2000)
RA 155.68146° · Dec 50.12871°
Galactic ℓ, b
163.647° · 53.566°
Ecliptic λ, β
136.853° · 36.809°
HTM-20 index
756659333
Observation Record
RV measurements
1
Emission spectra
3
Archive notes
1
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