TOI-4010 d
Astrophysical Synthesis & Habitability Characterization
TOI-4010 d is a confirmed gas giant exoplanet orbiting the star TOI-4010, located approximately 578.9 light-years (177.5 parsecs) from the Solar System. First announced in 2023 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.466% across the stellar disk), this world measures 6.18 Earth radii (0.55 Jupiter radii) and has a measured mass of 38.15 Earth masses (0.12 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.89 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1 g⊕ (9.81 m/s²), and an escape velocity of 27.8 km/s.
In its orbital architecture around TOI-4010, TOI-4010 d completes one full revolution every 14.709 Earth days at a semi-major axis of 0.113 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 83.6 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.07 carries the world between 0.1051 AU at periapsis and 0.1209 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 650 K (+377°C / +711°F) and receiving 30.00 S⊕ (~40,830 W/m²), TOI-4010 d orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4010 is classified as an orange K-type star of spectral type K V with an effective photospheric temperature of 4,960 K, a radius of 0.83 R☉, a mass of 0.88 M☉, an estimated bolometric luminosity of 0.374 L☉. Stellar evolution modeling indicates an estimated stellar age of 6.1 Gyr and a metallicity of [Fe/H] = 0.37 dex (metal-rich relative to the Sun). From Earth, TOI-4010 shines at apparent V-band magnitude 12.291 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-4010 system is a multi-planet architecture hosting 4 confirmed worlds, with TOI-4010 d sharing its stellar neighborhood alongside TOI-4010 b, TOI-4010 c, TOI-4010 e.
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 | TOI-4010 |
| Spectral Type | K V |
| Effective Temp (Teff) | 4,960 K |
| Stellar Radius | 0.8300 R☉ |
| Stellar Mass | 0.8800 M☉ |
| Bolometric Luminosity | 0.374 L☉ |
| Metallicity [Fe/H] | 0.370 dex |
| Stellar Age | 6.100 Gyr |
| Apparent Magnitude | V: 12.291 · G: 12.122 |
| System Architecture | 1 Star, 4 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.113000 AU |
| Orbital Period | 14.709 days |
| Mean Orbital Velocity | 83.6 km/s |
| Orbital Eccentricity (e) | 0.07000 |
| Orbital Inclination (i) | 89.0000° |
| Mean Bulk Density | 0.89 g/cm³ (27.8 km/s vesc) |
| Insolation Flux | 30.0000 S⊕ (~40,830 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 578.900 LY (177.504 pc) |