HD 27442 planetary system
HD 27442 is an orange main-sequence star of spectral type K1/2III approximately 59.6 light-years from Earth (18.27 parsecs). It hosts 1 confirmed exoplanet.
Host star
- Name
- HD 27442
- Spectral type
- K1/2III
- Effective temperature
- 4,846 K
- Mass
- 1.23 M☉ (solar masses)
- Radius
- 3.18 R☉ (solar radii)
- Distance
- 18.27 pc (59.6 ly)
- Hipparcos catalog
- HIP 19921
Confirmed planets (1)
| Planet | Class | Mass (M⊕) | Radius (R⊕) | Period (d) | Distance (AU) | Eq. temp (K) | Discovered |
|---|---|---|---|---|---|---|---|
| HD 27442 b | Neptune-like | 495.80 | 13.50 | 428.10 | 1.2710 | — | 2000 |
The planets in detail
HD 27442 b is a Neptune-like world with about 13.50 Earth radii and 495.80 Earth masses. It orbits HD 27442 at 1.2710 AU with a 428-day year, and no published equilibrium temperature. It was confirmed in 2000 via radial velocity (Doppler) measurements.
Discovery
The single planet in the HD 27442 system was confirmed in 2000 using radial velocity (Doppler) measurements. Detection facilities: 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 64.1205°, declination -59.3029°. 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.
