DMPP-8 b
Astrophysical Synthesis & Habitability Characterization
DMPP-8 b is a confirmed gas giant exoplanet orbiting the star DMPP-8, located approximately 248.3 light-years (76.13 parsecs) from the Solar System. First announced in 2026 by Multiple Observatories using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 10.8 Earth radii (0.96 Jupiter radii) and has a measured mass of 81.09 Earth masses (0.26 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.35 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.7 g⊕ (6.86 m/s²), and an escape velocity of 30.7 km/s.
In its orbital architecture around DMPP-8, DMPP-8 b completes one full revolution every 62.915 Earth days at a semi-major axis of 0.3098 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 53.6 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.275, swinging from 0.2246 AU at periapsis out to 0.395 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 580 K (+307°C / +585°F) and receiving 17.78 S⊕ (~24,204 W/m²), DMPP-8 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star DMPP-8 is classified as a stellar host with an effective photospheric temperature of 6,009 K, a radius of 1.24 R☉, a mass of 0.99 M☉, an estimated bolometric luminosity of 1.799 L☉. From Earth, DMPP-8 shines at apparent V-band magnitude 8.65 (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: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | DMPP-8 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,009 K |
| Stellar Radius | 1.2400 R☉ |
| Stellar Mass | 0.9900 M☉ |
| Bolometric Luminosity | 1.799 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 8.650 · G: 8.494 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.309800 AU |
| Orbital Period | 62.915 days |
| Mean Orbital Velocity | 53.6 km/s |
| Orbital Eccentricity (e) | 0.27500 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.35 g/cm³ (30.7 km/s vesc) |
| Insolation Flux | 17.7838 S⊕ (~24,204 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 248.300 LY (76.134 pc) |