HD 160691 planetary system
HD 160691 is a Sun-like main-sequence star of spectral type G3 IV-V approximately 50.9 light-years from Earth (15.60 parsecs). It hosts 4 confirmed exoplanets.
Host star
- Name
- HD 160691
- Spectral type
- G3 IV-V
- Effective temperature
- 5,773 K
- Mass
- 1.13 M☉ (solar masses)
- Radius
- 1.33 R☉ (solar radii)
- Distance
- 15.60 pc (50.9 ly)
- Hipparcos catalog
- HIP 86796
Confirmed planets (4)
| Planet | Class | Mass (M⊕) | Radius (R⊕) | Period (d) | Distance (AU) | Eq. temp (K) | Discovered |
|---|---|---|---|---|---|---|---|
| HD 160691 d | Mini-Neptune | 10.49 | 3.23 | 9.64 | 0.0952 | 900 | 2004 |
| HD 160691 e | Unknown size | 2224.80 | — | 307.90 | 0.9600 | — | 2006 |
| HD 160691 b | Unknown size | 1366.66 | — | 645.00 | 1.5000 | — | 2000 |
| HD 160691 c | Unknown size | 1398.44 | — | 3947.00 | 4.1700 | — | 2004 |
The planets in detail
HD 160691 d is a Mini-Neptune with about 3.23 Earth radii and 10.49 Earth masses. It orbits HD 160691 at 0.0952 AU with a 9.6-day year, and a scorching equilibrium temperature of 900 K. It was confirmed in 2004 via radial velocity (Doppler) measurements.
HD 160691 e is a planet of unknown size with about 2224.80 Earth masses. It orbits HD 160691 at 0.9600 AU with a 308-day year, and no published equilibrium temperature. It was confirmed in 2006 via radial velocity (Doppler) measurements.
HD 160691 b is a planet of unknown size with about 1366.66 Earth masses. It orbits HD 160691 at 1.5000 AU with a 645-day year, and no published equilibrium temperature. It was confirmed in 2000 via radial velocity (Doppler) measurements.
HD 160691 c is a planet of unknown size with about 1398.44 Earth masses. It orbits HD 160691 at 4.1700 AU with a 10.8-Earth-year orbit, and no published equilibrium temperature. It was confirmed in 2004 via radial velocity (Doppler) measurements.
Discovery
The HD 160691 system was first identified in 2000, with confirmation work continuing through 2006 using radial velocity (Doppler) measurements. Detection facilities: La Silla Observatory, Anglo-Australian Telescope.
Observing from Earth
Exoplanets cannot be resolved visually with amateur telescopes — the host star's glare is overwhelming and even space-based direct imaging requires sophisticated coronagraphs. What you can observe is the host star itself at right ascension 266.0362°, declination -51.8349°. Use the 3D orrery above to inspect orbital geometry, planetary scale, and the habitable-zone overlay — the orbits are computed from the published Keplerian elements and animate at user-controlled time rates.
