Key parameters at a glance
- A radius of 17.32 Earth radii
- A mass of 323.23 Earth masses
- Surface gravity around 1.08 g
- An orbital period of 3.309 days
- Semi-major axis 0.0521 AU
- Equilibrium temperature 2,132 K (1859 °C)
- Distance from Earth 526.74 light-years
- Earth Similarity Index 0.047
- Travel time at Voyager 1 speed 9,288,979 years
HD 202772 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#99of 1771
top 5.5%
This planet
17.32R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 202772 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 17.32 | 11.21 |
| Mass (M⊕) | 1.00 | 323.23 | 317.83 |
| Density (g/cm³) | 5.51 | 0.34 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.08 | 2.53 |
| Insolation (S⊕) | 1.00 | 3,440.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 323.233 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 321.962 M⊕ | Lower bound from radial-velocity fitting. |
| Computed mass | 323.445 M⊕ | Model-computed mass (e.g. from mass-radius relation). |
Star Catalogue Identifiers
HD
HD 202772 A
TIC
TIC 290131778
Gaia DR2
Gaia DR2 6790773586275235200
Gaia DR3
Gaia DR3 6790773586275235200
System
HD 202772
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.31 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0521 AU.
Transit Fingerprint
Depth
0.376 %
Duration
5.630 h
Impact parameter b
0.403
Rp / R★
0.061280
Transit midpoint (BJD)
2,458,338.6105
Photometric dip
Transit produces a flux drop of 3,755 ppm lasting ≈ 5.63 h.
Extended Orbital Architecture
Planet / star radius ratio
0.061280
Semi-major axis / stellar radius
4.330
Impact parameter (b)
0.403
RV semi-amplitude (K)
96.400 m/s
Transit mid-time (BJD)
2,458,338.6105
Long. of periastron (ω)
98.00°
Angular separation (arcsec)
0.32200
Eq. Temperature
2,132K
(1859 °C)
Insolation (S⊕)
3,440.00
Earth = 1.00
Earth Similarity (ESI)
0.047
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
Wang et al. 2019Instrument
TESS CCD Array
Publication
2019-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2019 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: HD 202772 A
Spectral Class
F-type yellow-white
Effective Temperature
6,272 K — hotter than the Sun (5,778 K)
Estimated Age
1.70 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
2.591 R☉
Stellar Mass
1.720 M☉
Metallicity [Fe/H]
0.30
Extended Stellar Properties
Surface gravity (log g)
3.848 dex
Stellar density
0.140 g/cm³
Systemic radial velocity
-17.71 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
6.166 mas
Total Proper Motion
62.070 mas/yr
PM Right Ascension
23.24 mas/yr
PM Declination
-57.56 mas/yr
Galactic Cartesian (pc)
x = 0.682 · y = -0.578 · z = -0.448
Equatorial (J2000)
RA 319.69959° · Dec -26.61637°
Galactic ℓ, b
20.762° · -42.950°
Ecliptic λ, β
313.888° · -10.430°
HTM-20 index
-593347022
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