DMPP-1 b
Astrophysical Synthesis & Habitability Characterization
DMPP-1 b is a confirmed sub-neptune exoplanet orbiting the star DMPP-1, located approximately 204 light-years (62.54 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 4.26 Earth radii (0.38 Jupiter radii) and has a measured mass of 16.8 Earth masses. Combining its mass and radius yields a mean bulk density of 1.2 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.93 g⊕ (9.12 m/s²), and an escape velocity of 22.2 km/s.
In its orbital architecture around DMPP-1, DMPP-1 b completes one full revolution every 17.812 Earth days at a semi-major axis of 0.1423 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 86.9 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.2 carries the world between 0.1138 AU at periapsis and 0.1708 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 877 K (+604°C / +1119°F) and receiving 103.07 S⊕ (~140,280 W/m²), DMPP-1 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star DMPP-1 is classified as a warm F-type star of spectral type F8 V with an effective photospheric temperature of 6,196 K, a radius of 1.26 R☉, a mass of 1.21 M☉, an estimated bolometric luminosity of 2.099 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.01 Gyr. From Earth, DMPP-1 shines at apparent V-band magnitude 7.98 (accessible to binoculars and small amateur telescopes) in the Southern celestial hemisphere. The DMPP-1 system is a multi-planet architecture hosting 4 confirmed worlds, with DMPP-1 b sharing its stellar neighborhood alongside DMPP-1 d, DMPP-1 e, DMPP-1 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: La Silla Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | DMPP-1 |
| Spectral Type | F8 V |
| Effective Temp (Teff) | 6,196 K |
| Stellar Radius | 1.2600 R☉ |
| Stellar Mass | 1.2100 M☉ |
| Bolometric Luminosity | 2.099 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | 2.010 Gyr |
| Apparent Magnitude | V: 7.980 · G: 7.850 |
| System Architecture | 1 Star, 4 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.142300 AU |
| Orbital Period | 17.812 days |
| Mean Orbital Velocity | 86.9 km/s |
| Orbital Eccentricity (e) | 0.20000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 1.2 g/cm³ (22.2 km/s vesc) |
| Insolation Flux | 103.0711 S⊕ (~140,280 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 204.000 LY (62.539 pc) |