TOI-1244 b
Astrophysical Synthesis & Habitability Characterization
TOI-1244 b is a confirmed sub-neptune exoplanet orbiting the star TOI-1244, located approximately 334.5 light-years (102.55 parsecs) from the Solar System. First announced in 2024 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0984% across the stellar disk), this world measures 2.467 Earth radii and has a measured mass of 6.6 Earth masses. Combining its mass and radius yields a mean bulk density of 2.42 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.08 g⊕ (10.59 m/s²), and an escape velocity of 18.3 km/s.
In its orbital architecture around TOI-1244, TOI-1244 b completes one full revolution every 6.4 Earth days at a semi-major axis of 0.060694 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 103.2 km/s (compared to Earth's 29.8 km/s). 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 715 K (+442°C / +828°F) and receiving 56.63 S⊕ (~77,073 W/m²), TOI-1244 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1244 is classified as a stellar host with an effective photospheric temperature of 4,599 K, a radius of 0.721 R☉, a mass of 0.73 M☉, an estimated bolometric luminosity of 0.209 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.9 Gyr and a metallicity of [Fe/H] = 0.034 dex (near-solar heavy-element abundance). From Earth, TOI-1244 shines at apparent V-band magnitude 11.929 (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-1244 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,599 K |
| Stellar Radius | 0.7210 R☉ |
| Stellar Mass | 0.7300 M☉ |
| Bolometric Luminosity | 0.209 L☉ |
| Metallicity [Fe/H] | 0.034 dex |
| Stellar Age | 5.900 Gyr |
| Apparent Magnitude | V: 11.929 · G: 11.677 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.060694 AU |
| Orbital Period | 6.4 days |
| Mean Orbital Velocity | 103.2 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.7483° |
| Mean Bulk Density | 2.42 g/cm³ (18.3 km/s vesc) |
| Insolation Flux | 56.6300 S⊕ (~77,073 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 334.500 LY (102.551 pc) |