11 UMi planetary system
11 UMi is an orange main-sequence star of spectral type K4 III approximately 409 light-years from Earth (125.32 parsecs). It hosts 1 confirmed exoplanet.
Host star
- Name
- 11 UMi
- Spectral type
- K4 III
- Effective temperature
- 4,213 K
- Mass
- 2.78 M☉ (solar masses)
- Radius
- 29.79 R☉ (solar radii)
- Distance
- 125.32 pc (409 ly)
- Hipparcos catalog
- HIP 74793
Confirmed planets (1)
| Planet | Class | Mass (M⊕) | Radius (R⊕) | Period (d) | Distance (AU) | Eq. temp (K) | Discovered |
|---|---|---|---|---|---|---|---|
| 11 UMi b | Neptune-like | 4684.81 | 12.30 | 516.22 | 1.5300 | — | 2009 |
The planets in detail
11 UMi b is a Neptune-like world with about 12.30 Earth radii and 4684.81 Earth masses. It orbits 11 UMi at 1.5300 AU with a 516-day year, and no published equilibrium temperature. It was confirmed in 2009 via radial velocity (Doppler) measurements.
Discovery
The single planet in the 11 UMi system was confirmed in 2009 using radial velocity (Doppler) measurements. Detection facilities: Thueringer Landessternwarte Tautenburg.
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 229.2746°, declination 71.8239°. 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.
