HD 95544 b
Astrophysical Synthesis & Habitability Characterization
HD 95544 b is a confirmed gas giant exoplanet orbiting the star HD 95544, located approximately 286.4 light-years (87.81 parsecs) from the Solar System. First announced in 2021 by Haute-Provence 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 1913.645 Earth masses (6.02 Jupiter masses). Combining its mass and radius yields a mean bulk density of 5.03 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 11.68 g⊕ (114.54 m/s²), and an escape velocity of 136.8 km/s.
In its orbital architecture around HD 95544, HD 95544 b completes one full revolution every 2041.542 Earth days (5.59Julian years) at a semi-major axis of 3.166 AU (corresponding to the middle-system regime between Mars at 1.52 AU and Jupiter at 5.20 AU). Its mean orbital velocity is approximately 16.9 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.049 (ranging from 3.0109 AU at periapsis to 3.3211 AU at apoapsis), the planet experiences minimal orbital distance variation.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 157 K (-116°C / -177°F) and an incident flux of 0.10 S⊕ (~136 W/m²), surface water and volatile species on HD 95544 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star HD 95544 is classified as a solar-type yellow star of spectral type G0 with an effective photospheric temperature of 5,722 K, a radius of 1.088 R☉, a mass of 1.01 M☉, an estimated bolometric luminosity of 1.139 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.11 dex (metal-rich relative to the Sun). From Earth, HD 95544 shines at apparent V-band magnitude 8.39 (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: Haute-Provence Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 95544 |
| Spectral Type | G0 |
| Effective Temp (Teff) | 5,722 K |
| Stellar Radius | 1.0880 R☉ |
| Stellar Mass | 1.0100 M☉ |
| Bolometric Luminosity | 1.139 L☉ |
| Metallicity [Fe/H] | 0.110 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 8.390 · G: 8.211 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 3.166000 AU |
| Orbital Period | 2041.542 days |
| Mean Orbital Velocity | 16.9 km/s |
| Orbital Eccentricity (e) | 0.04900 |
| Orbital Inclination (i) | 86.4970° |
| Mean Bulk Density | 5.03 g/cm³ (136.8 km/s vesc) |
| Insolation Flux | 0.1000 S⊕ (~136 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 286.400 LY (87.805 pc) |