TOI-4898 b
Astrophysical Synthesis & Habitability Characterization
TOI-4898 b is a confirmed sub-neptune exoplanet orbiting the star TOI-4898, located approximately 321.6 light-years (98.6 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 0.2846% across the stellar disk), this world measures 3.72 Earth radii (0.33 Jupiter radii) and has a measured mass of 13.4 Earth masses. Combining its mass and radius yields a mean bulk density of 1.44 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.97 g⊕ (9.51 m/s²), and an escape velocity of 21.2 km/s.
In its orbital architecture around TOI-4898, TOI-4898 b completes one full revolution every 2.765 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 667 K (+394°C / +741°F) and receiving 33.01 S⊕ (~44,933 W/m²), TOI-4898 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4898 is classified as a stellar host with an effective photospheric temperature of 4,202 K, a radius of 0.6393 R☉, a mass of 0.6191 M☉, an estimated bolometric luminosity of 0.114 L☉. From Earth, TOI-4898 shines at apparent V-band magnitude 13.62 (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-4898 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,202 K |
| Stellar Radius | 0.6393 R☉ |
| Stellar Mass | 0.6191 M☉ |
| Bolometric Luminosity | 0.114 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 13.620 · G: 12.906 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 2.765 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 87.3917° |
| Mean Bulk Density | 1.44 g/cm³ (21.2 km/s vesc) |
| Insolation Flux | 33.0144 S⊕ (~44,933 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 321.600 LY (98.596 pc) |