DMPP-7 b
Astrophysical Synthesis & Habitability Characterization
DMPP-7 b is a confirmed gas giant exoplanet orbiting the star DMPP-7, located approximately 330.7 light-years (101.39 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 9.78 Earth radii (0.87 Jupiter radii) and has a measured mass of 68.958 Earth masses (0.22 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.41 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.72 g⊕ (7.06 m/s²), and an escape velocity of 29.7 km/s.
In its orbital architecture around DMPP-7, DMPP-7 b completes one full revolution every 4.927 Earth days at a semi-major axis of 0.0607 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 134 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.054 carries the world between 0.0574 AU at periapsis and 0.064 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1456 K (+1183°C / +2161°F) and receiving 749.47 S⊕ (~1,020,026 W/m²), DMPP-7 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star DMPP-7 is classified as a solar-type yellow star of spectral type G1 V with an effective photospheric temperature of 6,096 K, a radius of 1.49 R☉, a mass of 1.23 M☉, an estimated bolometric luminosity of 2.751 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.87 Gyr and a metallicity of [Fe/H] = 0.13 dex (metal-rich relative to the Sun). From Earth, DMPP-7 shines at apparent V-band magnitude 8.79 (accessible to binoculars and small amateur telescopes) in the Northern 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-7 |
| Spectral Type | G1 V |
| Effective Temp (Teff) | 6,096 K |
| Stellar Radius | 1.4900 R☉ |
| Stellar Mass | 1.2300 M☉ |
| Bolometric Luminosity | 2.751 L☉ |
| Metallicity [Fe/H] | 0.130 dex |
| Stellar Age | 3.870 Gyr |
| Apparent Magnitude | V: 8.790 · G: 8.653 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.060700 AU |
| Orbital Period | 4.927 days |
| Mean Orbital Velocity | 134 km/s |
| Orbital Eccentricity (e) | 0.05400 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.41 g/cm³ (29.7 km/s vesc) |
| Insolation Flux | 749.4682 S⊕ (~1,020,026 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 330.700 LY (101.386 pc) |