HD 135344 A b
Astrophysical Synthesis & Habitability Characterization
HD 135344 A b is a confirmed gas giant exoplanet orbiting the star HD 135344 A, located approximately 461.8 light-years (141.6 parsecs) from the Solar System. First announced in 2025 by Paranal Observatory using the Imaging detection technique (resolved directly via high-contrast coronagraphic or interferometric imaging), this world measures 16.253 Earth radii (1.45 Jupiter radii) and has a measured mass of 3178.284 Earth masses (10 Jupiter masses). Combining its mass and radius yields a mean bulk density of 4.08 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 12.03 g⊕ (117.97 m/s²), and an escape velocity of 156.4 km/s.
The planet follows a highly eccentric trajectory (e = 0.5, swinging from 8.25 AU at periapsis out to 24.75 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1585 K (+1312°C / +2394°F) and receiving 0.06 S⊕ (~83 W/m²), HD 135344 A b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HD 135344 A is classified as a luminous A-type star of spectral type A0 V with an effective photospheric temperature of 9,540 K, a radius of 1.5 R☉, a mass of 2.32 M☉, an estimated bolometric luminosity of 16.721 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.05 dex (near-solar heavy-element abundance). From Earth, HD 135344 A shines at apparent V-band magnitude 7.765 (accessible to binoculars and small amateur telescopes) in the Southern 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: Paranal Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 135344 A |
| Spectral Type | A0 V |
| Effective Temp (Teff) | 9,540 K |
| Stellar Radius | 1.5000 R☉ |
| Stellar Mass | 2.3200 M☉ |
| Bolometric Luminosity | 16.721 L☉ |
| Metallicity [Fe/H] | 0.050 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 7.765 · G: 7.737 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 16.500000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | 0.50000 |
| Orbital Inclination (i) | 73.6000° |
| Mean Bulk Density | 4.08 g/cm³ (156.4 km/s vesc) |
| Insolation Flux | 0.0610 S⊕ (~83 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 461.800 LY (141.595 pc) |