TOI-6281 b
Astrophysical Synthesis & Habitability Characterization
TOI-6281 b is a confirmed super-earth exoplanet orbiting the star TOI-6281, located approximately 188.3 light-years (57.75 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 0.0407% across the stellar disk), this world measures 1.924 Earth radii and has a measured mass of 4.36 Earth masses. Combining its mass and radius yields a mean bulk density of 3.38 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.18 g⊕ (11.57 m/s²), and an escape velocity of 16.8 km/s.
In its orbital architecture around TOI-6281, TOI-6281 b completes one full revolution every 1.054 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 2240 K (+1967°C / +3573°F) and receiving 4,181.02 S⊕ (~5,690,368 W/m²), TOI-6281 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-6281 is classified as a stellar host with an effective photospheric temperature of 4,533 K, a radius of 0.8742 R☉, a mass of 0.65 M☉, an estimated bolometric luminosity of 0.29 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.09 dex (near-solar heavy-element abundance). From Earth, TOI-6281 shines at apparent V-band magnitude 10.885 (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-6281 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,533 K |
| Stellar Radius | 0.8742 R☉ |
| Stellar Mass | 0.6500 M☉ |
| Bolometric Luminosity | 0.29 L☉ |
| Metallicity [Fe/H] | -0.090 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 10.885 · G: 10.652 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 1.054 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 85.0499° |
| Mean Bulk Density | 3.38 g/cm³ (16.8 km/s vesc) |
| Insolation Flux | 4181.0200 S⊕ (~5,690,368 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 188.300 LY (57.745 pc) |