HD 109833 b
HD 109833 b is a mini-Neptune orbiting HD 109833 in the constellation Musca. It lies about 260 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is HD 109833 b?
HD 109833 b has a radius of 2.89 times that of Earth.
Is HD 109833 b in the Habitable Zone?
The position of HD 109833 b relative to the habitable zone of HD 109833 cannot be precisely determined from the available orbital data.
Habitable zone of HD 109833: 0.810–1.904 AU (conservative: 1.026–1.805 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 HD 109833 b — one full orbit around HD 109833 — lasts 9.19 Earth days, shorter than Mercury's 88-day year. Its orbit is mildly elliptical (eccentricity 0.18).
How Was HD 109833 b Discovered?
HD 109833 b was discovered in 2022 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 109833 b?
HD 109833 b is 259.5 light-years (79.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1767. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,567,200 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 109833 b scores 0.22, ranking #3,624 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 109833
HD 109833
- Surface temperature
- 5,881 K (Sun: 5,772 K)
- Mass
- 1.08 M☉
- Radius
- 1.00 R☉
- Luminosity
- 1.1800 L☉
- Age
- 0.0 billion years (Sun: 4.6)
The HD 109833 Planetary System
HD 109833 b is one of 2 known planets in the HD 109833 system. Its siblings:
- HD 109833 c (Mini Neptune)
HD 109833 b — Complete Data
| Radius | 2.888 Earth radii (0.258 Jupiter radii) |
|---|---|
| Orbital period | 9.19 days |
| Eccentricity | 0.180 |
| Earth Similarity Index | 0.22 |
| Distance from Earth | 259.5 light-years (79.6 parsecs) |
| Constellation | Musca |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-12-17. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 109833 b
Is HD 109833 b habitable?
HD 109833 b is not known to orbit within the habitable zone of HD 109833, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is HD 109833 b?
HD 109833 b is about 260 light-years from Earth in the constellation Musca. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,567,200 years to get there.
How big is HD 109833 b compared to Earth?
HD 109833 b has 2.89 times the radius of Earth.
How long is a year on HD 109833 b?
One orbit around HD 109833 takes 9.2 Earth days — short enough that 40 of its years would fit into one Earth year.
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