TYC 3318-01333-1 b
Astrophysical Synthesis & Habitability Characterization
TYC 3318-01333-1 b is a confirmed gas giant exoplanet orbiting the star TYC 3318-01333-1, located approximately 1600.2 light-years (490.61 parsecs) from the Solar System. First announced in 2018 by Multiple Observatories using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 13.1 Earth radii (1.17 Jupiter radii) and has a measured mass of 1086.979 Earth masses (3.42 Jupiter masses). Combining its mass and radius yields a mean bulk density of 2.67 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 6.33 g⊕ (62.08 m/s²), and an escape velocity of 101.9 km/s.
In its orbital architecture around TYC 3318-01333-1, TYC 3318-01333-1 b completes one full revolution every 562 Earth days (1.54Julian years) at a semi-major axis of 1.414 AU (comparable to the inner terrestrial zone between Venus, Earth at 1.00 AU, and Mars at 1.52 AU). Its mean orbital velocity is approximately 27.4 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.098 carries the world between 1.2754 AU at periapsis and 1.5526 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 470 K (+197°C / +387°F) and receiving 8.11 S⊕ (~11,040 W/m²), TYC 3318-01333-1 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TYC 3318-01333-1 is classified as a stellar host with an effective photospheric temperature of 4,776 K, a radius of 5.9 R☉, a mass of 1.19 M☉, an estimated bolometric luminosity of 16.25 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.06 dex (near-solar heavy-element abundance). From Earth, TYC 3318-01333-1 shines at apparent V-band magnitude 9.901 (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: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TYC 3318-01333-1 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,776 K |
| Stellar Radius | 5.9000 R☉ |
| Stellar Mass | 1.1900 M☉ |
| Bolometric Luminosity | 16.25 L☉ |
| Metallicity [Fe/H] | -0.060 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 9.901 · G: 9.463 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 1.414000 AU |
| Orbital Period | 562 days |
| Mean Orbital Velocity | 27.4 km/s |
| Orbital Eccentricity (e) | 0.09800 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.67 g/cm³ (101.9 km/s vesc) |
| Insolation Flux | 8.1115 S⊕ (~11,040 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1600.200 LY (490.610 pc) |