NGTS-32 b
Astrophysical Synthesis & Habitability Characterization
NGTS-32 b is a confirmed gas giant exoplanet orbiting the star NGTS-32, located approximately 2731.4 light-years (837.46 parsecs) from the Solar System. First announced in 2025 by Next-Generation Transit Survey (NGTS) using the Transit detection technique (producing an estimated primary transit depth of 0.6222% across the stellar disk), this world measures 15.917 Earth radii (1.42 Jupiter radii) and has a measured mass of 181.162 Earth masses (0.57 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.25 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.72 g⊕ (7.06 m/s²), and an escape velocity of 37.7 km/s.
In its orbital architecture around NGTS-32, NGTS-32 b completes one full revolution every 3.312 Earth days at a semi-major axis of 0.044 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 144.5 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1750 K (+1477°C / +2691°F) and receiving 1,554.00 S⊕ (~2,114,994 W/m²), NGTS-32 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star NGTS-32 is classified as a stellar host with an effective photospheric temperature of 5,680 K, a radius of 1.85 R☉, a mass of 1.07 M☉, an estimated bolometric luminosity of 3.196 L☉. Stellar evolution modeling indicates an estimated stellar age of 8.03 Gyr and a metallicity of [Fe/H] = -0.03 dex (near-solar heavy-element abundance). From Earth, NGTS-32 shines at apparent V-band magnitude 13.588 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere.
Methodology: Computed using the Schulze-Makuch et al. (2011) weighted metric comparing physical interior (radius, estimated density) and surface thermal regime (escape velocity, equilibrium temperature).
Discovery Facility: Next-Generation Transit Survey (NGTS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | NGTS-32 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,680 K |
| Stellar Radius | 1.8500 R☉ |
| Stellar Mass | 1.0700 M☉ |
| Bolometric Luminosity | 3.196 L☉ |
| Metallicity [Fe/H] | -0.030 dex |
| Stellar Age | 8.030 Gyr |
| Apparent Magnitude | V: 13.588 · G: 13.312 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.044000 AU |
| Orbital Period | 3.312 days |
| Mean Orbital Velocity | 144.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 86.9000° |
| Mean Bulk Density | 0.25 g/cm³ (37.7 km/s vesc) |
| Insolation Flux | 1554.0000 S⊕ (~2,114,994 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2731.400 LY (837.457 pc) |