HD 181433
A K-type star with three confirmed exoplanets.
Last updated
HD 181433 is a star in the southern constellation Pavo, too faint to be seen without optical aid at an apparent visual magnitude of 8.40. It lies 88 light years from the Sun and is drifting away with a radial velocity of +40 km/s. The star's spectral classification is disputed, with estimates ranging from K3III-IV to K5V, and its luminosity is only 0.34 times that of the Sun.
Quick Facts
- Constellation
- Pavo
- Apparent visual magnitude
- 8.40
- Distance
- 88 light years
- Radial velocity
- +40 km/s
- Effective temperature
- 4,909 K
- Projected rotational velocity
- 1.6 km/s
Facts from the source article.
Planetary system
Three planets orbit HD 181433, announced in 2008 and published in 2009. The innermost is a super-Earth with a minimum mass of 7.56 Earth masses and an orbital period of 9.3743 days.
The middle and outer planets are gas giants with minimum masses of 0.64 and 0.54 Jupiter masses and periods of 962 and 2172 days, respectively. The initial orbital solution was unstable; a 2019 update found a stable configuration. In 2025, astrometry provided the inclination and true mass of the outer planet, and indicated a semi-major axis 56% larger than earlier values, though uncertainties remain high.
More in Planetary Systems with Three Confirmed Planets
Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: HD 181433 (CC BY-SA 4.0).
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