TOI-7149 b
Astrophysical Synthesis & Habitability Characterization
TOI-7149 b is a confirmed gas giant exoplanet orbiting the star TOI-7149, located approximately 411.4 light-years (126.13 parsecs) from the Solar System. First announced in 2025 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 11.8871% across the stellar disk), this world measures 13.2 Earth radii (1.18 Jupiter radii) and has a measured mass of 224 Earth masses (0.7 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.54 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.29 g⊕ (12.65 m/s²), and an escape velocity of 46.1 km/s.
In its orbital architecture around TOI-7149, TOI-7149 b completes one full revolution every 2.652 Earth days at a semi-major axis of 0.02603 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 106.8 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.078 carries the world between 0.024 AU at periapsis and 0.0281 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 593 K (+320°C / +608°F) and receiving 20.60 S⊕ (~28,037 W/m²), TOI-7149 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-7149 is classified as a low-mass red dwarf of spectral type M4 V with an effective photospheric temperature of 3,363 K, a radius of 0.351 R☉, a mass of 0.344 M☉, an estimated bolometric luminosity of 0.014 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.8 Gyr and a metallicity of [Fe/H] = -0.08 dex (near-solar heavy-element abundance). From Earth, TOI-7149 shines at apparent Gaia G-band magnitude 16.159 (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-7149 |
| Spectral Type | M4 V |
| Effective Temp (Teff) | 3,363 K |
| Stellar Radius | 0.3510 R☉ |
| Stellar Mass | 0.3440 M☉ |
| Bolometric Luminosity | 0.014 L☉ |
| Metallicity [Fe/H] | -0.080 dex |
| Stellar Age | 7.800 Gyr |
| Apparent Magnitude | · G: 16.159 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.026030 AU |
| Orbital Period | 2.652 days |
| Mean Orbital Velocity | 106.8 km/s |
| Orbital Eccentricity (e) | 0.07800 |
| Orbital Inclination (i) | 89.2500° |
| Mean Bulk Density | 0.54 g/cm³ (46.1 km/s vesc) |
| Insolation Flux | 20.6000 S⊕ (~28,037 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 411.400 LY (126.126 pc) |