TYC 2187-512-1 b
Astrophysical Synthesis & Habitability Characterization
TYC 2187-512-1 b is a confirmed gas giant exoplanet orbiting the star TYC 2187-512-1, located approximately 50.5 light-years (15.47 parsecs) from the Solar System. First announced in 2022 by Calar Alto Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 12.5 Earth radii (1.12 Jupiter radii) and has a measured mass of 104.883 Earth masses (0.33 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.3 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.67 g⊕ (6.57 m/s²), and an escape velocity of 32.4 km/s.
In its orbital architecture around TYC 2187-512-1, TYC 2187-512-1 b completes one full revolution every 691.9 Earth days (1.89Julian years) at a semi-major axis of 1.22 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 19.2 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.05 carries the world between 1.159 AU at periapsis and 1.281 AU at apoapsis, driving measurable seasonal insolation cycles.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 115 K (-158°C / -252°F) and an incident flux of 0.03 S⊕ (~38 W/m²), surface water and volatile species on TYC 2187-512-1 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star TYC 2187-512-1 is classified as a low-mass red dwarf of spectral type M1.0 V with an effective photospheric temperature of 3,734 K, a radius of 0.495 R☉, a mass of 0.498 M☉, an estimated bolometric luminosity of 0.043 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.08 dex (metal-rich relative to the Sun). From Earth, TYC 2187-512-1 shines at apparent V-band magnitude 10.58 (faint and requiring research-grade or CCD telescopic photometry) 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: Calar Alto Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TYC 2187-512-1 |
| Spectral Type | M1.0 V |
| Effective Temp (Teff) | 3,734 K |
| Stellar Radius | 0.4950 R☉ |
| Stellar Mass | 0.4980 M☉ |
| Bolometric Luminosity | 0.043 L☉ |
| Metallicity [Fe/H] | 0.080 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 10.580 · G: 9.770 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 1.220000 AU |
| Orbital Period | 691.9 days |
| Mean Orbital Velocity | 19.2 km/s |
| Orbital Eccentricity (e) | 0.05000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.3 g/cm³ (32.4 km/s vesc) |
| Insolation Flux | 0.0279 S⊕ (~38 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 50.500 LY (15.474 pc) |