HD 142 planetary system
HD 142 is a yellow-white main-sequence star of spectral type F7V approximately 85.4 light-years from Earth (26.19 parsecs). It hosts 3 confirmed exoplanets.
Host star
- Name
- HD 142
- Spectral type
- F7V
- Effective temperature
- 6,245 K
- Mass
- 1.21 M☉ (solar masses)
- Radius
- 1.47 R☉ (solar radii)
- Distance
- 26.19 pc (85.4 ly)
- Hipparcos catalog
- HIP 522
Confirmed planets (3)
| Planet | Class | Mass (M⊕) | Radius (R⊕) | Period (d) | Distance (AU) | Eq. temp (K) | Discovered |
|---|---|---|---|---|---|---|---|
| HD 142 A d | Neptune-like | 82.64 | 10.90 | 108.45 | 0.4740 | — | 2022 |
| HD 142 b | Neptune-like | 2256.58 | 12.70 | 351.43 | 1.0390 | — | 2001 |
| HD 142 c | Neptune-like | 3464.65 | 12.40 | 10159.64 | 9.8110 | — | 2012 |
The planets in detail
HD 142 A d is a Neptune-like world with about 10.90 Earth radii and 82.64 Earth masses. It orbits HD 142 at 0.4740 AU with a 108-day year, and no published equilibrium temperature. It was confirmed in 2022 via radial velocity (Doppler) measurements.
HD 142 b is a Neptune-like world with about 12.70 Earth radii and 2256.58 Earth masses. It orbits HD 142 at 1.0390 AU with a 351-day year, and no published equilibrium temperature. It was confirmed in 2001 via radial velocity (Doppler) measurements.
HD 142 c is a Neptune-like world with about 12.40 Earth radii and 3464.65 Earth masses. It orbits HD 142 at 9.8110 AU with a 27.8-Earth-year orbit, and no published equilibrium temperature. Its orbit is notably eccentric (e = 0.28), meaning the distance to its star — and the irradiation it receives — varies substantially over each year. It was confirmed in 2012 via radial velocity (Doppler) measurements.
Discovery
The HD 142 system was first identified in 2001, with confirmation work continuing through 2022 using radial velocity (Doppler) measurements. Detection facilities: Multiple Observatories, 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 1.5837°, declination -49.0754°. 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.
