Key parameters at a glance
- A radius of 20.74 Earth radii
- A mass of 292.40 Earth masses
- Surface gravity around 0.68 g
- An orbital period of 3.474 days
- Semi-major axis 0.0500 AU
- Equilibrium temperature 1,782 K (1509 °C)
- Distance from Earth 1,291.94 light-years
- Earth Similarity Index 0.050
- Travel time at Voyager 1 speed 22,783,299 years
HAT-P-33 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#28of 1771
top 1.5%
This planet
20.74R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HAT-P-33 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 20.74 | 11.21 |
| Mass (M⊕) | 1.00 | 292.40 | 317.83 |
| Density (g/cm³) | 5.51 | 0.20 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.68 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,701.38 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 292.404 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 239154970
Gaia DR2
Gaia DR2 893550942158776832
Gaia DR3
Gaia DR3 893550942158776832
System
HAT-P-33
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.47 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0500 AU.
Transit Fingerprint
Depth
1.100 %
Duration
4.414 h
Impact parameter b
0.325
Rp / R★
0.100970
Transit midpoint (BJD)
2,458,078.1299
Photometric dip
Transit produces a flux drop of 11,000 ppm lasting ≈ 4.41 h.
Extended Orbital Architecture
Planet / star radius ratio
0.100970
Semi-major axis / stellar radius
6.570
Impact parameter (b)
0.325
RV semi-amplitude (K)
82.700 m/s
Transit mid-time (BJD)
2,458,078.1299
Long. of periastron (ω)
15.00°
Sky-projected obliquity (λ)
-5.90°
Angular separation (arcsec)
0.12600
Eq. Temperature
1,782K
(1509 °C)
Insolation (S⊕)
1,701.38
Earth = 1.00
Earth Similarity (ESI)
0.050
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
Hartman et al. 2011Instrument
2K CCD Sensor
Publication
2011-11
Observation locale
Ground
Discovery cohort
Planets confirmed in 2011 at HATNet (10 shown).
Host System: HAT-P-33
Spectral Class
F-type yellow-white
Effective Temperature
6,446 K — hotter than the Sun (5,778 K)
Estimated Age
2.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.790 R☉
Stellar Mass
1.820 M☉
Metallicity [Fe/H]
0.05
Extended Stellar Properties
Surface gravity (log g)
4.150 dex
Stellar density
0.450 g/cm³
Systemic radial velocity
23.03 km/s
Rotational v·sin i
15.57 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.497 mas
Total Proper Motion
2.649 mas/yr
PM Right Ascension
0.10 mas/yr
PM Declination
-2.65 mas/yr
Galactic Cartesian (pc)
x = -0.327 · y = 0.764 · z = 0.557
Equatorial (J2000)
RA 113.18424° · Dec 33.83502°
Galactic ℓ, b
185.307° · 22.730°
Ecliptic λ, β
109.524° · 11.954°
HTM-20 index
-479207920
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