HR 858
Three transiting sub-Neptunes orbit a nearby F-type star.
Last updated
HR 858 is a yellow-white F-type main-sequence star located 103 light-years from the Sun in the southern constellation of Fornax. It is visible to the naked eye as a challenging target with an apparent visual magnitude of 6.4. The star hosts a planetary system of at least three transiting exoplanets discovered in 2019.
Quick Facts
- Distance
- 103 light-years (31.5 parsecs)
- Constellation
- Fornax
- Apparent visual magnitude
- 6.4
- Stellar classification
- F6V
- Effective temperature
- 6,201 K
Facts from the source article.
Planetary system
The three exoplanets, each about twice Earth's radius, were detected via the transit method. They are described as super-Earths but may be sub-Neptunes in composition. Planets b and c may be in a 3:5 mean-motion resonance.
Radial velocity measurements yielded masses for planets b and d, with densities of 2.44 and 4.9 g/cm³. Planet c's mass is constrained to be less than a certain value, with a less reliable TTV measurement. The system shows significant transit timing variations.
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: HR 858 (CC BY-SA 4.0).
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