7 CMa planetary system
7 CMa is an orange main-sequence star of spectral type K1III(+M) approximately 64.6 light-years from Earth (19.81 parsecs). It hosts 2 confirmed exoplanets.
Host star
- Name
- 7 CMa
- Spectral type
- K1III(+M)
- Effective temperature
- 4,826 K
- Mass
- 1.34 M☉ (solar masses)
- Radius
- 4.87 R☉ (solar radii)
- Distance
- 19.81 pc (64.6 ly)
- Hipparcos catalog
- HIP 31592
Confirmed planets (2)
| Planet | Class | Mass (M⊕) | Radius (R⊕) | Period (d) | Distance (AU) | Eq. temp (K) | Discovered |
|---|---|---|---|---|---|---|---|
| 7 CMa b | Neptune-like | 587.99 | 13.40 | 735.10 | 1.7580 | — | 2011 |
| 7 CMa c | Neptune-like | 276.51 | 13.90 | 996.00 | 2.1530 | — | 2019 |
The planets in detail
7 CMa b is a Neptune-like world with about 13.40 Earth radii and 587.99 Earth masses. It orbits 7 CMa at 1.7580 AU with a 2.0-Earth-year orbit, and no published equilibrium temperature. It was confirmed in 2011 via radial velocity (Doppler) measurements.
7 CMa c is a Neptune-like world with about 13.90 Earth radii and 276.51 Earth masses. It orbits 7 CMa at 2.1530 AU with a 2.7-Earth-year orbit, and no published equilibrium temperature. It was confirmed in 2019 via radial velocity (Doppler) measurements.
Discovery
The 7 CMa system was first identified in 2011, with confirmation work continuing through 2019 using radial velocity (Doppler) measurements. Detection facilities: Anglo-Australian Telescope, Multiple Observatories.
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 99.1713°, declination -19.2562°. 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.
