DMPP-4 b
DMPP-4 b is a Neptune-like planet orbiting the F5-F8 V star DMPP-4 in the constellation Cygnus. It lies about 83 light-years from Earth and was discovered in 2023 using the radial velocity method.
Is DMPP-4 b in the Habitable Zone?
DMPP-4 b orbits inside the inner edge of the habitable zone of DMPP-4. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of DMPP-4: 1.226–2.851 AU (conservative: 1.553–2.703 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on DMPP-4 b — one full orbit around DMPP-4 — lasts 3.50 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.049 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.06).
How Was DMPP-4 b Discovered?
DMPP-4 b was discovered in 2023 using the radial velocity method, with observations from Multiple Observatories.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is DMPP-4 b?
DMPP-4 b is 82.6 light-years (25.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1944. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,453,760 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. DMPP-4 b scores 0.19, ranking #3,963 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: DMPP-4
DMPP-4
- Spectral type
- F5-F8 V
- Surface temperature
- 6,400 K (Sun: 5,772 K)
- Mass
- 1.25 M☉
- Radius
- 1.38 R☉
- Luminosity
- 2.8800 L☉
- Age
- 2.2 billion years (Sun: 4.6)
Planetary System
DMPP-4 b is the only planet known to orbit DMPP-4 so far.
DMPP-4 b — Complete Data
| Mass (best estimate) | 12.20 Earth masses |
|---|---|
| Orbital period | 3.50 days |
| Orbital distance | 0.049 AU |
| Eccentricity | 0.063 |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 82.6 light-years (25.3 parsecs) |
| Constellation | Cygnus |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-08-07. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About DMPP-4 b
Is DMPP-4 b habitable?
No — DMPP-4 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is DMPP-4 b?
DMPP-4 b is about 83 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,453,760 years to get there.
How long is a year on DMPP-4 b?
One orbit around DMPP-4 takes 3.5 Earth days — short enough that 104 of its years would fit into one Earth year.
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