51 Peg planetary system
51 Peg is a Sun-like main-sequence star of spectral type G5V approximately 50.4 light-years from Earth (15.46 parsecs). It hosts 1 confirmed exoplanet.
Host star
- Name
- 51 Peg
- Spectral type
- G5V
- Effective temperature
- 5,758 K
- Mass
- 1.03 M☉ (solar masses)
- Radius
- 1.18 R☉ (solar radii)
- Distance
- 15.46 pc (50.4 ly)
- Hipparcos catalog
- HIP 113357
Confirmed planets (1)
| Planet | Class | Mass (M⊕) | Radius (R⊕) | Period (d) | Distance (AU) | Eq. temp (K) | Discovered |
|---|---|---|---|---|---|---|---|
| 51 Peg b | Neptune-like | 146.20 | 14.30 | 4.23 | 0.0527 | — | 1995 |
The planets in detail
51 Peg b is a Neptune-like world with about 14.30 Earth radii and 146.20 Earth masses. It orbits 51 Peg at 0.0527 AU with a 4.2-day year, and no published equilibrium temperature. It was confirmed in 1995 via radial velocity (Doppler) measurements.
Discovery
The single planet in the 51 Peg system was confirmed in 1995 using radial velocity (Doppler) measurements. Detection facilities: Haute-Provence 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 344.3675°, declination 20.7691°. 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.
