TOI-5489 b
Astrophysical Synthesis & Habitability Characterization
TOI-5489 b is a confirmed super-earth exoplanet orbiting the star TOI-5489, located approximately 147.1 light-years (45.09 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 0.0934% across the stellar disk), this world measures 1.4 Earth radii and has a measured mass of 2.54 Earth masses. Combining its mass and radius yields a mean bulk density of 5.1 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.3 g⊕ (12.75 m/s²), and an escape velocity of 15.1 km/s.
In its orbital architecture around TOI-5489, TOI-5489 b completes one full revolution every 3.152 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 624 K (+351°C / +664°F) and receiving 25.11 S⊕ (~34,180 W/m²), TOI-5489 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5489 is classified as a stellar host with an effective photospheric temperature of 3,547 K, a radius of 0.42 R☉, a mass of 0.41 M☉, an estimated bolometric luminosity of 0.025 L☉. From Earth, TOI-5489 shines at apparent V-band magnitude 13.824 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-5489 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-5489 b sharing its stellar neighborhood alongside TOI-5489 c.
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-5489 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,547 K |
| Stellar Radius | 0.4200 R☉ |
| Stellar Mass | 0.4100 M☉ |
| Bolometric Luminosity | 0.025 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 13.824 · G: 12.818 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 3.152 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.6000° |
| Mean Bulk Density | 5.1 g/cm³ (15.1 km/s vesc) |
| Insolation Flux | 25.1137 S⊕ (~34,180 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 147.100 LY (45.091 pc) |