HD 183579 b
HD 183579 b is a sub-Neptune orbiting HD 183579 in the constellation Telescopium. It lies about 187 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is HD 183579 b?
HD 183579 b has a radius of 3.49 times that of Earth. Its mass is 20.4 times that of Earth, giving it a density of 2.65 g/cm³ — between that of rocky and gaseous planets.
Is HD 183579 b in the Habitable Zone?
HD 183579 b orbits inside the inner edge of the habitable zone of HD 183579. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 183579: 0.722–1.700 AU (conservative: 0.914–1.611 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HD 183579 b
The equilibrium temperature of HD 183579 b is about 752 K (479 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on HD 183579 b — one full orbit around HD 183579 — lasts 17.5 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.132 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.06).
How Was HD 183579 b Discovered?
HD 183579 b was discovered in 2021 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is HD 183579 b?
HD 183579 b is 186.8 light-years (57.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1840. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,287,680 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. HD 183579 b scores 0.21, ranking #3,785 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 183579
HD 183579
- Surface temperature
- 5,784 K (Sun: 5,772 K)
- Mass
- 1.00 M☉
- Radius
- 0.96 R☉
- Luminosity
- 0.9250 L☉
- Age
- 3.1 billion years (Sun: 4.6)
Planetary System
HD 183579 b is the only planet known to orbit HD 183579 so far.
HD 183579 b — Complete Data
| Radius | 3.490 Earth radii (0.311 Jupiter radii) |
|---|---|
| Mass | 20.40 Earth masses (0.064 Jupiter masses) |
| Density | 2.65 g/cm³ (Earth: 5.51) |
| Orbital period | 17.47 days |
| Orbital distance | 0.132 AU |
| Eccentricity | 0.061 |
| Equilibrium temperature | 752 K (479 °C) |
| Earth Similarity Index | 0.21 |
| Distance from Earth | 186.8 light-years (57.3 parsecs) |
| Constellation | Telescopium |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2024-08-29. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 183579 b
Is HD 183579 b habitable?
No — HD 183579 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 183579 b?
HD 183579 b is about 187 light-years from Earth in the constellation Telescopium. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,287,680 years to get there.
How big is HD 183579 b compared to Earth?
HD 183579 b has 3.49 times the radius of Earth and about 20.4 times its mass.
How long is a year on HD 183579 b?
One orbit around HD 183579 takes 17.5 Earth days — short enough that 21 of its years would fit into one Earth year.
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