BD-08 2823 b
BD-08 2823 b is a Neptune-like planet orbiting the K3 V star BD-08 2823 in the constellation Sextans. It lies about 135 light-years from Earth and was discovered in 2009 using the radial velocity method.
Is BD-08 2823 b in the Habitable Zone?
The position of BD-08 2823 b relative to the habitable zone of BD-08 2823 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on BD-08 2823 b — one full orbit around BD-08 2823 — lasts 5.60 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.060 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.15).
How Was BD-08 2823 b Discovered?
BD-08 2823 b was discovered in 2009 using the radial velocity method, with observations from La Silla Observatory.
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 BD-08 2823 b?
BD-08 2823 b is 134.8 light-years (41.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1892. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,372,480 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. BD-08 2823 b scores 0.21, ranking #3,831 of 5,565 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: BD-08 2823
BD-08 2823
- Spectral type
- K3 V
- Surface temperature
- 4,746 K (Sun: 5,772 K)
- Mass
- 0.74 M☉
- Age
- 4.5 billion years (Sun: 4.6)
The BD-08 2823 Planetary System
BD-08 2823 b is one of 2 known planets in the BD-08 2823 system. Its siblings:
- BD-08 2823 c (Cold Gas Giant)
BD-08 2823 b — Complete Data
| Mass (best estimate) | 12.71 Earth masses |
|---|---|
| Orbital period | 5.60 days |
| Orbital distance | 0.060 AU |
| Eccentricity | 0.150 |
| Earth Similarity Index | 0.21 |
| Distance from Earth | 134.8 light-years (41.3 parsecs) |
| Constellation | Sextans |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2009 |
Data: NASA Exoplanet Archive, last updated 2018-09-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About BD-08 2823 b
Is BD-08 2823 b habitable?
BD-08 2823 b is not known to orbit within the habitable zone of BD-08 2823, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is BD-08 2823 b?
BD-08 2823 b is about 135 light-years from Earth in the constellation Sextans. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,372,480 years to get there.
How long is a year on BD-08 2823 b?
One orbit around BD-08 2823 takes 5.6 Earth days — short enough that 65 of its years would fit into one Earth year.
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