Planetary System
As of 1998, Iota Horologii is known to have a Jupiter-sized extrasolar planet. The planet designated Iota Horologii b was the result of a long-term survey of forty solar-type stars that was begun in November 1992.
Observations of Iota Horologii in October 2000 appeared to show a dust disc around the star at a distance of 65 AU, similar to the Kuiper belt in our solar system. However further analysis revealed the dust disc to be an instrumental artifact and the discovery claim was retracted.
Stability analysis reveals that the orbits of Earth-sized planets located in the planet's trojan points would be stable for long periods of time.
Based on residuals in the radial velocity curve, a planet in an eccentric orbit with a period of approximately 600 days was proposed, but this was not confirmed and it seems likely that the effect was due to activity on Iota Horologii itself.
| Companion |
Mass | Semimajor axis |
Orbital period |
Eccentricity | Radius |
|---|---|---|---|---|---|
| b | ≥2.24 ± 0.13 MJ | 0.91 | 311.3 ± 1.3 | 0.22 ± 0.06 | — |
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