HD 18438 b explained

HD 18438 b is a massive gas giant exoplanet or brown dwarf orbiting the star HD 18438, a red giant star located 731.0664 light years (224.146 parsecs) away from planet earth.^[1]

Physical characteristics

The planet is a massive planet with a mass 21 Jupiter mass and 1.08 Jupiter radii.^[2]

Orbital characteristics

The planet orbits its host star at a distance of 2.1 astronomical units (AU) at a velocity of 305 meters a second taking 803 days to complete one orbit around the star. Its orbital eccentricy is 0.1.^[1]

Further reading

• 1 . Lee . Byeong-Cheol . Koo . Jae-Rim . Jeong . Gwanghui . Park . Myeong-Gu . Han . Inwoo . Choi . Yeon-Ho . A Search for Exoplanets around Northern Circumpolar Stars. VII. Detection of Planetary Companion Orbiting the Largest Host Star HD 18438 . Journal of The Korean Astronomical Society . 56 . 1 . 2023-12-30 . 10.5303/JKAS.2023.56.1.35 . 35–40.
• 1 . Bang . Tae-Yang . Lee . Byeong-Cheol . Jeong . Gwang-Hui . Han . Inwoo . Park . Myeong-Gu . SEARCH FOR EXOPLANETS AROUND NORTHERN CIRCUMPOLAR STARS III. LONG-PERIOD RADIAL VELOCITY VARIATIONS IN HD 18438 AND HD 158996 . Journal of The Korean Astronomical Society . 51 . 1 . 2018-02-28 . 10.5303/JKAS.2018.51.1.17 . 17–25.

Notes and References

1. Web site: HD 18438 NASA Exoplanet Archive . 31 October 2023 . exoplanetarchive.ipac.caltech.edu . 8 June 2023 . https://web.archive.org/web/20230608121531/https://exoplanetarchive.ipac.caltech.edu/overview/HD%2018438 . live .
2. Web site: Exoplanet-catalog . 31 October 2023 . Exoplanet Exploration: Planets Beyond our Solar System . en . 4 June 2023 . https://web.archive.org/web/20230604212200/https://exoplanets.nasa.gov/exoplanet-catalog/8811/hd-18438-b/ . live .