HD 60779 b
Astrophysical Synthesis & Habitability Characterization
HD 60779 b is a confirmed sub-neptune exoplanet orbiting the star HD 60779, located approximately 115.6 light-years (35.45 parsecs) from the Solar System. First announced in 2026 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0695% across the stellar disk), this world measures 3.246 Earth radii (0.29 Jupiter radii) and has a measured mass of 14.19 Earth masses. Combining its mass and radius yields a mean bulk density of 2.29 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.35 g⊕ (13.24 m/s²), and an escape velocity of 23.4 km/s.
In its orbital architecture around HD 60779, HD 60779 b completes one full revolution every 29.986 Earth days at a semi-major axis of 0.1922 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 69.7 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.031 (ranging from 0.1862 AU at periapsis to 0.1982 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 650 K (+377°C / +711°F) and receiving 42.39 S⊕ (~57,696 W/m²), HD 60779 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HD 60779 is classified as a solar-type yellow star of spectral type G1 V with an effective photospheric temperature of 6,081 K, a radius of 1.129 R☉, a mass of 1.05 M☉, an estimated bolometric luminosity of 1.564 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.12 dex (metal-poor relative to the Sun). From Earth, HD 60779 shines at apparent V-band magnitude 7.163 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The HD 60779 system is a multi-planet architecture hosting 2 confirmed worlds, with HD 60779 b sharing its stellar neighborhood alongside HD 60779 c.
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: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 60779 |
| Spectral Type | G1 V |
| Effective Temp (Teff) | 6,081 K |
| Stellar Radius | 1.1290 R☉ |
| Stellar Mass | 1.0500 M☉ |
| Bolometric Luminosity | 1.564 L☉ |
| Metallicity [Fe/H] | -0.120 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 7.163 · G: 7.008 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.192200 AU |
| Orbital Period | 29.986 days |
| Mean Orbital Velocity | 69.7 km/s |
| Orbital Eccentricity (e) | 0.03100 |
| Orbital Inclination (i) | 88.5600° |
| Mean Bulk Density | 2.29 g/cm³ (23.4 km/s vesc) |
| Insolation Flux | 42.3921 S⊕ (~57,696 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 115.600 LY (35.445 pc) |