IRAS 04125+2902 b
Astrophysical Synthesis & Habitability Characterization
IRAS 04125+2902 b is a confirmed gas giant exoplanet orbiting the star IRAS 04125+2902, located approximately 519.4 light-years (159.24 parsecs) from the Solar System. First announced in 2024 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.4609% across the stellar disk), this world measures 10.738 Earth radii (0.96 Jupiter radii) and has a measured mass of 80.8 Earth masses (0.25 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.36 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.7 g⊕ (6.86 m/s²), and an escape velocity of 30.7 km/s.
In its orbital architecture around IRAS 04125+2902, IRAS 04125+2902 b completes one full revolution every 8.835 Earth days at a semi-major axis of 0.077 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 94.8 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 854 K (+581°C / +1078°F) and receiving 41.42 S⊕ (~56,372 W/m²), IRAS 04125+2902 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star IRAS 04125+2902 is classified as a stellar host with an effective photospheric temperature of 4,080 K, a radius of 1.45 R☉, a mass of 0.7 M☉, an estimated bolometric luminosity of 0.523 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.003 Gyr. From Earth, IRAS 04125+2902 shines at apparent V-band magnitude 15.642 (faint and requiring research-grade or CCD telescopic photometry) in the Northern 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 | IRAS 04125+2902 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,080 K |
| Stellar Radius | 1.4500 R☉ |
| Stellar Mass | 0.7000 M☉ |
| Bolometric Luminosity | 0.523 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | 0.003 Gyr |
| Apparent Magnitude | V: 15.642 · G: 13.991 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.077000 AU |
| Orbital Period | 8.835 days |
| Mean Orbital Velocity | 94.8 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.3000° |
| Mean Bulk Density | 0.36 g/cm³ (30.7 km/s vesc) |
| Insolation Flux | 41.4199 S⊕ (~56,372 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 519.400 LY (159.244 pc) |