TOI-4616 b
Astrophysical Synthesis & Habitability Characterization
TOI-4616 b is a confirmed terrestrial exoplanet orbiting the star TOI-4616, located approximately 91.7 light-years (28.1 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 0.3506% across the stellar disk), this world measures 1.22 Earth radii and has a measured mass of 1.98 Earth masses. Combining its mass and radius yields a mean bulk density of 6.01 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.33 g⊕ (13.04 m/s²), and an escape velocity of 14.3 km/s.
In its orbital architecture around TOI-4616, TOI-4616 b completes one full revolution every 1.554 Earth days. The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 525 K (+252°C / +486°F) and receiving 40.00 S⊕ (~54,440 W/m²), TOI-4616 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4616 is classified as a low-mass red dwarf of spectral type M4±0.5 with an effective photospheric temperature of 3,150 K, a radius of 0.1889 R☉, a mass of 0.1881 M☉, an estimated bolometric luminosity of 0.00315 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.32 dex (metal-poor relative to the Sun). From Earth, TOI-4616 shines at apparent V-band magnitude 14.753 (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 | TOI-4616 |
| Spectral Type | M4±0.5 |
| Effective Temp (Teff) | 3,150 K |
| Stellar Radius | 0.1889 R☉ |
| Stellar Mass | 0.1881 M☉ |
| Bolometric Luminosity | 0.00315 L☉ |
| Metallicity [Fe/H] | -0.320 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 14.753 · G: 14.213 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 1.554 days |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 6.01 g/cm³ (14.3 km/s vesc) |
| Insolation Flux | 40.0000 S⊕ (~54,440 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 91.700 LY (28.102 pc) |