NGTS-35 b
Astrophysical Synthesis & Habitability Characterization
NGTS-35 b is a confirmed gas giant exoplanet orbiting the star NGTS-35, located approximately 597.1 light-years (183.08 parsecs) from the Solar System. First announced in 2025 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 1.7612% across the stellar disk), this world measures 10.9 Earth radii (0.97 Jupiter radii) and has a measured mass of 152 Earth masses (0.48 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.65 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.28 g⊕ (12.55 m/s²), and an escape velocity of 41.8 km/s.
In its orbital architecture around NGTS-35, NGTS-35 b completes one full revolution every 25.241 Earth days at a semi-major axis of 0.16 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 69 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.192 carries the world between 0.1293 AU at periapsis and 0.1907 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 451 K (+178°C / +352°F) and receiving 9.84 S⊕ (~13,397 W/m²), NGTS-35 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star NGTS-35 is classified as an orange K-type star of spectral type K3.5 V with an effective photospheric temperature of 4,717 K, a radius of 0.753 R☉, a mass of 0.789 M☉, an estimated bolometric luminosity of 0.252 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.5 Gyr and a metallicity of [Fe/H] = 0.085 dex (metal-rich relative to the Sun). From Earth, NGTS-35 shines at apparent V-band magnitude 13.059 (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: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | NGTS-35 |
| Spectral Type | K3.5 V |
| Effective Temp (Teff) | 4,717 K |
| Stellar Radius | 0.7530 R☉ |
| Stellar Mass | 0.7890 M☉ |
| Bolometric Luminosity | 0.252 L☉ |
| Metallicity [Fe/H] | 0.085 dex |
| Stellar Age | 1.500 Gyr |
| Apparent Magnitude | V: 13.059 · G: 12.716 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.160000 AU |
| Orbital Period | 25.241 days |
| Mean Orbital Velocity | 69 km/s |
| Orbital Eccentricity (e) | 0.19200 |
| Orbital Inclination (i) | 88.8160° |
| Mean Bulk Density | 0.65 g/cm³ (41.8 km/s vesc) |
| Insolation Flux | 9.8437 S⊕ (~13,397 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 597.100 LY (183.078 pc) |