TOI-2545 b
Astrophysical Synthesis & Habitability Characterization
TOI-2545 b is a confirmed sub-neptune exoplanet orbiting the star TOI-2545, located approximately 349.4 light-years (107.12 parsecs) from the Solar System. First announced in 2022 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0405% across the stellar disk), this world measures 2.75 Earth radii and has a measured mass of 8 Earth masses. Combining its mass and radius yields a mean bulk density of 2.12 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.06 g⊕ (10.4 m/s²), and an escape velocity of 19.1 km/s.
In its orbital architecture around TOI-2545, TOI-2545 b completes one full revolution every 7.994 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1023 K (+750°C / +1382°F) and receiving 258.82 S⊕ (~352,256 W/m²), TOI-2545 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2545 is classified as a stellar host with an effective photospheric temperature of 5,846 K, a radius of 1.2532 R☉, a mass of 1.055 M☉, an estimated bolometric luminosity of 1.646 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.273 dex (metal-poor relative to the Sun). From Earth, TOI-2545 shines at apparent V-band magnitude 9.521 (accessible to binoculars and small amateur telescopes) 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-2545 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,846 K |
| Stellar Radius | 1.2532 R☉ |
| Stellar Mass | 1.0550 M☉ |
| Bolometric Luminosity | 1.646 L☉ |
| Metallicity [Fe/H] | -0.273 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 9.521 · G: 9.295 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 7.994 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.12 g/cm³ (19.1 km/s vesc) |
| Insolation Flux | 258.8217 S⊕ (~352,256 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 349.400 LY (107.118 pc) |