HIP 113103 b
Astrophysical Synthesis & Habitability Characterization
HIP 113103 b is a confirmed super-earth exoplanet orbiting the star HIP 113103, located approximately 150.7 light-years (46.21 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 0.0511% across the stellar disk), this world measures 1.829 Earth radii and has a measured mass of 4 Earth masses. Combining its mass and radius yields a mean bulk density of 3.6 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.2 g⊕ (11.77 m/s²), and an escape velocity of 16.5 km/s.
In its orbital architecture around HIP 113103, HIP 113103 b completes one full revolution every 7.61 Earth days at a semi-major axis of 0.06899 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 98.6 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.17 carries the world between 0.0573 AU at periapsis and 0.0807 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 721 K (+448°C / +838°F) and receiving 55.74 S⊕ (~75,856 W/m²), HIP 113103 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HIP 113103 is classified as a stellar host with an effective photospheric temperature of 4,930 K, a radius of 0.742 R☉, a mass of 0.761 M☉, an estimated bolometric luminosity of 0.292 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.47 Gyr and a metallicity of [Fe/H] = -0.1 dex (near-solar heavy-element abundance). From Earth, HIP 113103 shines at apparent V-band magnitude 9.95 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The HIP 113103 system is a multi-planet architecture hosting 2 confirmed worlds, with HIP 113103 b sharing its stellar neighborhood alongside HIP 113103 c.
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 | HIP 113103 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,930 K |
| Stellar Radius | 0.7420 R☉ |
| Stellar Mass | 0.7610 M☉ |
| Bolometric Luminosity | 0.292 L☉ |
| Metallicity [Fe/H] | -0.100 dex |
| Stellar Age | 0.470 Gyr |
| Apparent Magnitude | V: 9.950 · G: 9.618 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.068990 AU |
| Orbital Period | 7.61 days |
| Mean Orbital Velocity | 98.6 km/s |
| Orbital Eccentricity (e) | 0.17000 |
| Orbital Inclination (i) | 88.2300° |
| Mean Bulk Density | 3.6 g/cm³ (16.5 km/s vesc) |
| Insolation Flux | 55.7356 S⊕ (~75,856 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 150.700 LY (46.212 pc) |