TIC 77552382 b
Astrophysical Synthesis & Habitability Characterization
TIC 77552382 b is a confirmed sub-neptune exoplanet orbiting the star TIC 77552382, located approximately 1217.9 light-years (373.42 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 0.3461% across the stellar disk), this world measures 5.692 Earth radii (0.51 Jupiter radii) and has a measured mass of 27.5 Earth masses. Combining its mass and radius yields a mean bulk density of 0.82 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.85 g⊕ (8.34 m/s²), and an escape velocity of 24.6 km/s.
In its orbital architecture around TIC 77552382, TIC 77552382 b completes one full revolution every 3.51 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1434 K (+1161°C / +2122°F) and receiving 701.74 S⊕ (~955,075 W/m²), TIC 77552382 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TIC 77552382 is classified as a stellar host with an effective photospheric temperature of 4,981 K, a radius of 0.887 R☉, a mass of 0.83 M☉, an estimated bolometric luminosity of 0.435 L☉. From Earth, TIC 77552382 shines at apparent V-band magnitude 13.892 (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 | TIC 77552382 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,981 K |
| Stellar Radius | 0.8870 R☉ |
| Stellar Mass | 0.8300 M☉ |
| Bolometric Luminosity | 0.435 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 13.892 · G: 13.613 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 3.51 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 87.7935° |
| Mean Bulk Density | 0.82 g/cm³ (24.6 km/s vesc) |
| Insolation Flux | 701.7449 S⊕ (~955,075 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1217.900 LY (373.415 pc) |