TCP J05074264+2447555 b
Astrophysical Synthesis & Habitability Characterization
TCP J05074264+2447555 b is a confirmed sub-neptune exoplanet orbiting the star TCP J05074264+2447555, located approximately 1647.1 light-years (505 parsecs) from the Solar System. First announced in 2018 by Multiple Observatories using the Microlensing detection technique (detected via relativistic gravitational lensing of a background source star), this world measures 4.72 Earth radii (0.42 Jupiter radii) and has a measured mass of 20 Earth masses. Combining its mass and radius yields a mean bulk density of 1.05 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.9 g⊕ (8.83 m/s²), and an escape velocity of 23 km/s.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 4.720 R⊕, TCP J05074264+2447555 b exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star TCP J05074264+2447555 is classified as a stellar host with an effective photospheric temperature of 5,805 K, a radius of 1.4249 R☉, a mass of 0.586 M☉, an estimated bolometric luminosity of 2.069 L☉. From Earth, TCP J05074264+2447555 shines at apparent V-band magnitude 14.243 (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: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TCP J05074264+2447555 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,805 K |
| Stellar Radius | 1.4249 R☉ |
| Stellar Mass | 0.5860 M☉ |
| Bolometric Luminosity | 2.069 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 14.243 · G: 13.833 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.940000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 1.05 g/cm³ (23 km/s vesc) |
| Insolation Flux | 2.3507 S⊕ (~3,199 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1647.100 LY (505.000 pc) |