Astronomy and Space

32 Eridani

32 Eridani (abbreviated 32 Eri) is a binary star in the constellation of Eridanus. The two stars are designated HD 24555 (32 Eridani A) and HD 24554 (32 Eridani B). They share a single entry in the Hipparcos catalogue, HIP 18255, but have separate entries in the Bright Star Catalogue, HR 1212 and HR 1211. 32 Eridani is visible to the naked eye as a single star with an apparent magnitude of 4.45. Individually, 32 Eridani A shines at magnitude 4.79 while 32 Eridani B has a magnitude of 6.14. As of 2021, the pair had an angular separation of about 6.90 arcseconds with a position angle of 349°. Based on measurements of parallax by the Gaia mission, the system lies at a distance of about 340 light-years (22,000,000 AU) from Earth. The primary component, 32 Eridani A, is an evolved yellow giant star of spectral type G8III. It has a radius about 15 times that of the Sun and a luminosity around 138 times solar, with an effective temperature of about 4,970 K. The secondary component, 32 Eridani B, is a main-sequence star of spectral type A1V. It has a surface temperature of roughly 9,294 K and rotates rapidly with a projected rotational velocity of about 180 km/s, giving the star a noticeably flattened shape due to its rotation.

Also on this shelf

See also

• ▸71 Aquilae
• ▸Blois
• ▸AFGL 2298

Uncatalogued shelf

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