---
name: Achird (η Cassiopeiae)
constellation: Cas
created_by: editor.cs
created_date: 2023-11-07 09:39:35.706374
updated_by: editor.cs
updated_date: 2023-11-07 09:39:35.706378
---
well-known binary star, discovered in 1779 by William Herschel. The yellow, golden star (3.7mag) has a separation of 13" (with the separation changing from 5" to 16" over the period) and is accompanied by a companion of brightness 7.4mag with a red, purplish tint, which orbits it every 526 years. The binary star can be resolved in a 6 cm telescope.