---
name: η Aquilae
constellation: Aql
created_by: 8mag
created_date: 2022-01-21 17:00:00
updated_by: skybber
updated_date: 2022-01-21 17:24:34.785146
---
The brightest Cepheid in the sky, 1,000 light years away, lies 8 degrees south of Altair. Changes in the brightness of this supergiant are easily perceived with the naked eye. In 7 days and 4 hours, its brightness fluctuates regularly between 3.7mag and 4.4mag. It is useful to compare its brightness variations with θ, δ (3mag) and λ (4mag) stars.