iot Dra planetary system
iot Dra is an orange main-sequence star of spectral type K2 III approximately 102 light-years from Earth (31.33 parsecs). It hosts 2 confirmed exoplanets.
Host star
- Name
- iot Dra
- Spectral type
- K2 III
- Effective temperature
- 4,504 K
- Mass
- 1.54 M☉ (solar masses)
- Radius
- 11.79 R☉ (solar radii)
- Distance
- 31.33 pc (102 ly)
- Hipparcos catalog
- HIP 75458
Confirmed planets (2)
| Planet | Class | Mass (M⊕) | Radius (R⊕) | Period (d) | Distance (AU) | Eq. temp (K) | Discovered |
|---|---|---|---|---|---|---|---|
| iot Dra b | Neptune-like | 3756.73 | 12.40 | 510.85 | 1.4530 | — | 2002 |
| iot Dra c | Neptune-like | 4958.12 | 12.20 | 25000.00 | 19.4000 | — | 2022 |
The planets in detail
iot Dra b is a Neptune-like world with about 12.40 Earth radii and 3756.73 Earth masses. It orbits iot Dra at 1.4530 AU with a 511-day year, and no published equilibrium temperature. Its orbit is notably eccentric (e = 0.70), meaning the distance to its star — and the irradiation it receives — varies substantially over each year. It was confirmed in 2002 via radial velocity (Doppler) measurements.
iot Dra c is a Neptune-like world with about 12.20 Earth radii and 4958.12 Earth masses. It orbits iot Dra at 19.4000 AU with a 68.4-Earth-year orbit, and no published equilibrium temperature. Its orbit is notably eccentric (e = 0.46), meaning the distance to its star — and the irradiation it receives — varies substantially over each year. It was confirmed in 2022 via radial velocity (Doppler) measurements.
Discovery
The iot Dra system was first identified in 2002, with confirmation work continuing through 2022 using radial velocity (Doppler) measurements. Detection facilities: Lick Observatory, La Silla 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 231.2323°, declination 58.9661°. 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.
