TOI-4561 b
Astrophysical Synthesis & Habitability Characterization
TOI-4561 b is a confirmed super-earth exoplanet orbiting the star TOI-4561, located approximately 583.8 light-years (179.01 parsecs) from the Solar System. First announced in 2026 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0366% across the stellar disk), this world measures 1.778 Earth radii and has a measured mass of 3.81 Earth masses. Combining its mass and radius yields a mean bulk density of 3.74 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.21 g⊕ (11.87 m/s²), and an escape velocity of 16.4 km/s.
In its orbital architecture around TOI-4561, TOI-4561 b completes one full revolution every 8.935 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 790 K (+517°C / +963°F) and receiving 91.96 S⊕ (~125,161 W/m²), TOI-4561 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4561 is classified as a stellar host with an effective photospheric temperature of 5,538 K, a radius of 0.852 R☉, a mass of 1 M☉, an estimated bolometric luminosity of 0.613 L☉. From Earth, TOI-4561 shines at apparent V-band magnitude 12.153 (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 | TOI-4561 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,538 K |
| Stellar Radius | 0.8520 R☉ |
| Stellar Mass | 1.0000 M☉ |
| Bolometric Luminosity | 0.613 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 12.153 · G: 11.541 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 8.935 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.8782° |
| Mean Bulk Density | 3.74 g/cm³ (16.4 km/s vesc) |
| Insolation Flux | 91.9624 S⊕ (~125,161 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 583.800 LY (179.008 pc) |