TOI-5595 b
Astrophysical Synthesis & Habitability Characterization
TOI-5595 b is a confirmed sub-neptune exoplanet orbiting the star TOI-5595, located approximately 446.7 light-years (136.96 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 0.3414% across the stellar disk), this world measures 4.737 Earth radii (0.42 Jupiter radii) and has a measured mass of 20.1 Earth masses. Combining its mass and radius yields a mean bulk density of 1.04 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.9 g⊕ (8.83 m/s²), and an escape velocity of 23 km/s.
In its orbital architecture around TOI-5595, TOI-5595 b completes one full revolution every 5.99 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 621 K (+348°C / +658°F) and receiving 24.76 S⊕ (~33,702 W/m²), TOI-5595 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5595 is classified as a stellar host with an effective photospheric temperature of 4,417 K, a radius of 0.7433 R☉, a mass of 0.645 M☉, an estimated bolometric luminosity of 0.189 L☉. From Earth, TOI-5595 shines at apparent V-band magnitude 13.316 (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-5595 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,417 K |
| Stellar Radius | 0.7433 R☉ |
| Stellar Mass | 0.6450 M☉ |
| Bolometric Luminosity | 0.189 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 13.316 · G: 12.972 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 5.99 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.0797° |
| Mean Bulk Density | 1.04 g/cm³ (23 km/s vesc) |
| Insolation Flux | 24.7628 S⊕ (~33,702 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 446.700 LY (136.955 pc) |