HD 11977 planetary system
HD 11977 is a Sun-like main-sequence star of spectral type G8 III/IV approximately 222 light-years from Earth (67.93 parsecs). It hosts 1 confirmed exoplanet.
Host star
- Name
- HD 11977
- Spectral type
- G8 III/IV
- Effective temperature
- 4,970 K
- Mass
- 1.91 M☉ (solar masses)
- Radius
- 10.09 R☉ (solar radii)
- Distance
- 67.93 pc (222 ly)
- Hipparcos catalog
- HIP 8928
Confirmed planets (1)
| Planet | Class | Mass (M⊕) | Radius (R⊕) | Period (d) | Distance (AU) | Eq. temp (K) | Discovered |
|---|---|---|---|---|---|---|---|
| HD 11977 b | Neptune-like | 2080.00 | 12.70 | 711.00 | 1.9300 | — | 2005 |
The planets in detail
HD 11977 b is a Neptune-like world with about 12.70 Earth radii and 2080.00 Earth masses. It orbits HD 11977 at 1.9300 AU with a 711-day year, and no published equilibrium temperature. Its orbit is notably eccentric (e = 0.40), meaning the distance to its star — and the irradiation it receives — varies substantially over each year. It was confirmed in 2005 via radial velocity (Doppler) measurements.
Discovery
The single planet in the HD 11977 system was confirmed in 2005 using radial velocity (Doppler) measurements. Detection facilities: La Silla Observatory.
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 28.7347°, declination -67.6470°. 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.
