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- 84 Ceti is the Flamsteed designation for a binary star system in the equatorial constellation of Cetus. It has an apparent visual magnitude of 5.7, making it faintly visible to the naked eye from dark suburban skies. Parallax measurements with the Hipparcos spacecraft put this system at a distance of around 74 light years. The primary, 84 Ceti A, is an F-type main sequence star with a stellar classification of F7V. It is slightly larger than the Sun, with 117% of the Sun's mass, 121% of the radius, and 213% of the luminosity. The abundance of elements more massive than helium is 71% of the Sun's and it has a relatively high projected rotational velocity of 32 km/s. This star is estimated to be less than half the age of the Sun, at 2.1 billion years. The secondary component, 84 Ceti B, has a classification of K2V, making it a K-type main sequence star. It lies at an angular separation of 3.3″ from the primary, which is equivalent to a physical separation of at least 74.5 AU. The space velocity components of this system are: –13(U), –25(V), –2(W) km/s. Based upon the position and motion, it is a candidate member of the Tucana-Horologium Association; this is a group of stars that share a similar motion through space and hence may have originated in the same molecular cloud. 84 Ceti is following an orbit through the Milky Way galaxy that has an eccentricity of 0.03, taking it as close as 22.3 kly (6.83 kpc) and as far as 26.2 kly (8.02 kpc) from the Galactic Center. The inclination of the orbital plane carries it as far as 260 ly (80 pc) away from the galactic plane. (en)
- 84 Ceti è una stella bianco-gialla nella sequenza principale di magnitudine 5,71 situata nella costellazione della Balena. Dista 71 anni luce dal sistema solare. (it)
- 84 Ceti, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna belägen i den nordöstra delen av stjärnbilden Valfisken. Den har en kombinerad skenbar magnitud på 5,71 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 44,3 mas, beräknas den befinna sig på ett avstånd på ca 74 ljusår (ca 23 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 4 km/s. (sv)
- 鯨魚座84，又名BD-01 377，HD 16765、SAO 130055、HR 790，是鯨魚座的一颗恒星，视星等为5.71，位于銀經172.42，銀緯-52.68，其B1900.0坐标为赤經2h 36m 6.5s，赤緯-1° -52.68′ 15″。 (zh)
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- 84 Ceti è una stella bianco-gialla nella sequenza principale di magnitudine 5,71 situata nella costellazione della Balena. Dista 71 anni luce dal sistema solare. (it)
- 84 Ceti, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna belägen i den nordöstra delen av stjärnbilden Valfisken. Den har en kombinerad skenbar magnitud på 5,71 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 44,3 mas, beräknas den befinna sig på ett avstånd på ca 74 ljusår (ca 23 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 4 km/s. (sv)
- 鯨魚座84，又名BD-01 377，HD 16765、SAO 130055、HR 790，是鯨魚座的一颗恒星，视星等为5.71，位于銀經172.42，銀緯-52.68，其B1900.0坐标为赤經2h 36m 6.5s，赤緯-1° -52.68′ 15″。 (zh)
- 84 Ceti is the Flamsteed designation for a binary star system in the equatorial constellation of Cetus. It has an apparent visual magnitude of 5.7, making it faintly visible to the naked eye from dark suburban skies. Parallax measurements with the Hipparcos spacecraft put this system at a distance of around 74 light years. The secondary component, 84 Ceti B, has a classification of K2V, making it a K-type main sequence star. It lies at an angular separation of 3.3″ from the primary, which is equivalent to a physical separation of at least 74.5 AU. (en)
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