DMPP-3 A b
Astrophysical Synthesis & Habitability Characterization
DMPP-3 A b is a confirmed super-earth exoplanet orbiting the star DMPP-3 A, located approximately 152.9 light-years (46.89 parsecs) from the Solar System. First announced in 2019 by La Silla Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 1.44 Earth radii and has a measured mass of 2.67 Earth masses. Combining its mass and radius yields a mean bulk density of 4.93 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.29 g⊕ (12.65 m/s²), and an escape velocity of 15.2 km/s.
In its orbital architecture around DMPP-3 A, DMPP-3 A b completes one full revolution every 5.59 Earth days at a semi-major axis of 0.05958 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 116 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.42, swinging from 0.0346 AU at periapsis out to 0.0846 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 854 K (+581°C / +1078°F) and receiving 142.78 S⊕ (~194,325 W/m²), DMPP-3 A b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star DMPP-3 A is classified as an orange K-type star of spectral type K0 V with an effective photospheric temperature of 5,138 K, a radius of 0.91 R☉, a mass of 0.9 M☉, an estimated bolometric luminosity of 0.518 L☉. Stellar evolution modeling indicates an estimated stellar age of 10.9 Gyr and a metallicity of [Fe/H] = 0.18 dex (metal-rich relative to the Sun). From Earth, DMPP-3 A shines at apparent V-band magnitude 9.1 (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: La Silla Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | DMPP-3 A |
| Spectral Type | K0 V |
| Effective Temp (Teff) | 5,138 K |
| Stellar Radius | 0.9100 R☉ |
| Stellar Mass | 0.9000 M☉ |
| Bolometric Luminosity | 0.518 L☉ |
| Metallicity [Fe/H] | 0.180 dex |
| Stellar Age | 10.900 Gyr |
| Apparent Magnitude | V: 9.100 · G: 8.854 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.059580 AU |
| Orbital Period | 5.59 days |
| Mean Orbital Velocity | 116 km/s |
| Orbital Eccentricity (e) | 0.42000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 4.93 g/cm³ (15.2 km/s vesc) |
| Insolation Flux | 142.7812 S⊕ (~194,325 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 152.900 LY (46.892 pc) |