DMPP-6 b
Astrophysical Synthesis & Habitability Characterization
DMPP-6 b is a confirmed sub-neptune exoplanet orbiting the star DMPP-6, located approximately 178.2 light-years (54.63 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 2.28 Earth radii and has a measured mass of 5.8 Earth masses. Combining its mass and radius yields a mean bulk density of 2.7 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.12 g⊕ (10.98 m/s²), and an escape velocity of 17.8 km/s.
In its orbital architecture around DMPP-6, DMPP-6 b completes one full revolution every 7.603 Earth days at a semi-major axis of 0.0779 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 111.5 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.34, swinging from 0.0514 AU at periapsis out to 0.1044 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1204 K (+931°C / +1708°F) and receiving 340.70 S⊕ (~463,689 W/m²), DMPP-6 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star DMPP-6 is classified as a stellar host with an effective photospheric temperature of 6,182 K, a radius of 1.27 R☉, a mass of 1.079 M☉, an estimated bolometric luminosity of 2.114 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.32 dex (metal-rich relative to the Sun). From Earth, DMPP-6 shines at apparent V-band magnitude 7.71 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The DMPP-6 system is a multi-planet architecture hosting 2 confirmed worlds, with DMPP-6 b sharing its stellar neighborhood alongside DMPP-6 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: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | DMPP-6 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,182 K |
| Stellar Radius | 1.2700 R☉ |
| Stellar Mass | 1.0790 M☉ |
| Bolometric Luminosity | 2.114 L☉ |
| Metallicity [Fe/H] | 0.320 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 7.710 · G: 7.561 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.077900 AU |
| Orbital Period | 7.603 days |
| Mean Orbital Velocity | 111.5 km/s |
| Orbital Eccentricity (e) | 0.34000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.7 g/cm³ (17.8 km/s vesc) |
| Insolation Flux | 340.6970 S⊕ (~463,689 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 178.200 LY (54.630 pc) |