TOI-5515 b
Astrophysical Synthesis & Habitability Characterization
TOI-5515 b is a confirmed sub-neptune exoplanet orbiting the star TOI-5515, located approximately 441.8 light-years (135.46 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 0.0848% across the stellar disk), this world measures 2.654 Earth radii and has a measured mass of 7.53 Earth masses. Combining its mass and radius yields a mean bulk density of 2.22 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.07 g⊕ (10.49 m/s²), and an escape velocity of 18.8 km/s.
In its orbital architecture around TOI-5515, TOI-5515 b completes one full revolution every 8.592 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 778 K (+505°C / +941°F) and receiving 86.63 S⊕ (~117,899 W/m²), TOI-5515 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5515 is classified as a stellar host with an effective photospheric temperature of 5,484 K, a radius of 0.8357 R☉, a mass of 0.963 M☉, an estimated bolometric luminosity of 0.567 L☉. From Earth, TOI-5515 shines at apparent V-band magnitude 11.147 (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-5515 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,484 K |
| Stellar Radius | 0.8357 R☉ |
| Stellar Mass | 0.9630 M☉ |
| Bolometric Luminosity | 0.567 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 11.147 · G: 11.003 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 8.592 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.5883° |
| Mean Bulk Density | 2.22 g/cm³ (18.8 km/s vesc) |
| Insolation Flux | 86.6267 S⊕ (~117,899 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 441.800 LY (135.459 pc) |