TYC 8998-760-1 b
Astrophysical Synthesis & Habitability Characterization
TYC 8998-760-1 b is a confirmed gas giant exoplanet orbiting the star TYC 8998-760-1, located approximately 308.6 light-years (94.62 parsecs) from the Solar System. First announced in 2020 by Paranal Observatory using the Imaging detection technique (resolved directly via high-contrast coronagraphic or interferometric imaging), this world measures 21.185 Earth radii (1.89 Jupiter radii) and has a measured mass of 6928.659 Earth masses (21.8 Jupiter masses). Combining its mass and radius yields a mean bulk density of 4.02 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 15.44 g⊕ (151.41 m/s²), and an escape velocity of 202.3 km/s.
The planet follows a highly eccentric trajectory (e = 0.44, swinging from 81.76 AU at periapsis out to 210.24 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 2638 K (+2365°C / +4289°F), TYC 8998-760-1 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TYC 8998-760-1 is classified as an orange K-type star of spectral type K3 IV with an effective photospheric temperature of 4,573 K, a radius of 1.02 R☉, a mass of 1 M☉, an estimated bolometric luminosity of 0.408 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.017 Gyr. From Earth, TYC 8998-760-1 shines at apparent V-band magnitude 11.124 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The TYC 8998-760-1 system is a multi-planet architecture hosting 2 confirmed worlds, with TYC 8998-760-1 b sharing its stellar neighborhood alongside TYC 8998-760-1 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: Paranal Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TYC 8998-760-1 |
| Spectral Type | K3 IV |
| Effective Temp (Teff) | 4,573 K |
| Stellar Radius | 1.0200 R☉ |
| Stellar Mass | 1.0000 M☉ |
| Bolometric Luminosity | 0.408 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | 0.017 Gyr |
| Apparent Magnitude | V: 11.124 · G: 10.651 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 146.000000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | 0.44000 |
| Orbital Inclination (i) | 90.6000° |
| Mean Bulk Density | 4.02 g/cm³ (202.3 km/s vesc) |
| Insolation Flux | 0.0000 S⊕ |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 308.600 LY (94.618 pc) |