Key parameters at a glance
- A radius of 18.38 Earth radii
- A mass of 1,153.72 Earth masses
- Surface gravity around 3.41 g
- An orbital period of 2.828 days
- Semi-major axis 0.0480 AU
- Equilibrium temperature 1,991 K (1718 °C)
- Distance from Earth 1,428.09 light-years
- Earth Similarity Index 0.040
- Travel time at Voyager 1 speed 25,184,372 years
NGTS-33 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#60of 1771
top 3.3%
This planet
18.38R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | NGTS-33 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 18.38 | 11.21 |
| Mass (M⊕) | 1.00 | 1,153.72 | 317.83 |
| Density (g/cm³) | 5.51 | 0.19 | 1.33 |
| Surface Gravity (g) | 1.00 | 3.41 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,620.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,153.717 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 97921547
Gaia DR2
Gaia DR2 5590415817155428224
Gaia DR3
Gaia DR3 5590415817155428224
System
TOI-6442
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.83 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0480 AU.
Transit Fingerprint
Depth
1.485 %
Duration
2.620 h
Impact parameter b
0.740
Rp / R★
0.114600
Transit midpoint (BJD)
2,459,986.4090
Photometric dip
Transit produces a flux drop of 14,846 ppm lasting ≈ 2.62 h.
Extended Orbital Architecture
Planet / star radius ratio
0.114600
Semi-major axis / stellar radius
6.990
Impact parameter (b)
0.740
RV semi-amplitude (K)
383.000 m/s
Transit mid-time (BJD)
2,459,986.4090
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.11000
Eq. Temperature
1,991K
(1718 °C)
Insolation (S⊕)
2,620.00
Earth = 1.00
Earth Similarity (ESI)
0.040
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
Alves et al. 2024Instrument
TESS CCD Array
Publication
2024-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: NGTS-33
Spectral Class
F-type yellow-white
Effective Temperature
7,437 K — hotter than the Sun (5,778 K)
Estimated Age
0.03 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.470 R☉
Stellar Mass
1.600 M☉
Metallicity [Fe/H]
-0.11
Extended Stellar Properties
Surface gravity (log g)
4.260 dex
Stellar density
0.810 g/cm³
Systemic radial velocity
18.90 km/s
Rotation period
0.67 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.255 mas
Total Proper Motion
8.187 mas/yr
PM Right Ascension
-5.06 mas/yr
PM Declination
6.44 mas/yr
Galactic Cartesian (pc)
x = -0.248 · y = 0.772 · z = -0.586
Equatorial (J2000)
RA 107.83333° · Dec -35.85052°
Galactic ℓ, b
247.350° · -11.801°
Ecliptic λ, β
117.589° · -57.594°
HTM-20 index
469154393
Similar Worlds
WASP-187 b
Gas Giant · F-type yellow-white
Radius 18.38 R⊕ · 1,211.4 ly
HATS-31 b
Gas Giant · F-type yellow-white
Radius 18.38 R⊕ · 2,524.4 ly
K2-260 b
Gas Giant · F-type yellow-white
Radius 18.42 R⊕ · 2,165.1 ly
HAT-P-60 b
Gas Giant · F-type yellow-white
Radius 18.28 R⊕ · 760.7 ly
WASP-90 b
Gas Giant · F-type yellow-white
Radius 18.27 R⊕ · 1,521.3 ly
WASP-82 b
Gas Giant · F-type yellow-white
Radius 18.16 R⊕ · 899.1 ly