TYC 3667-1280-1 b
Astrophysical Synthesis & Habitability Characterization
TYC 3667-1280-1 b is a confirmed gas giant exoplanet orbiting the star TYC 3667-1280-1, located approximately 1557.4 light-years (477.52 parsecs) from the Solar System. First announced in 2016 by McDonald Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 12.8 Earth radii (1.14 Jupiter radii) and has a measured mass of 1716.282 Earth masses (5.4 Jupiter masses). Combining its mass and radius yields a mean bulk density of 4.51 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 10.48 g⊕ (102.77 m/s²), and an escape velocity of 129.5 km/s.
In its orbital architecture around TYC 3667-1280-1, TYC 3667-1280-1 b completes one full revolution every 26.468 Earth days at a semi-major axis of 0.21 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 86.3 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.036 (ranging from 0.2024 AU at periapsis to 0.2176 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1350 K (+1077°C / +1971°F) and receiving 543.95 S⊕ (~740,320 W/m²), TYC 3667-1280-1 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TYC 3667-1280-1 is classified as a stellar host with an effective photospheric temperature of 5,130 K, a radius of 6.26 R☉, a mass of 1.87 M☉, an estimated bolometric luminosity of 24.351 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.35 Gyr and a metallicity of [Fe/H] = -0.08 dex (near-solar heavy-element abundance). From Earth, TYC 3667-1280-1 shines at apparent V-band magnitude 9.856 (accessible to binoculars and small amateur telescopes) 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: McDonald Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TYC 3667-1280-1 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,130 K |
| Stellar Radius | 6.2600 R☉ |
| Stellar Mass | 1.8700 M☉ |
| Bolometric Luminosity | 24.351 L☉ |
| Metallicity [Fe/H] | -0.080 dex |
| Stellar Age | 1.350 Gyr |
| Apparent Magnitude | V: 9.856 · G: 9.423 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.210000 AU |
| Orbital Period | 26.468 days |
| Mean Orbital Velocity | 86.3 km/s |
| Orbital Eccentricity (e) | 0.03600 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 4.51 g/cm³ (129.5 km/s vesc) |
| Insolation Flux | 543.9530 S⊕ (~740,320 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1557.400 LY (477.516 pc) |