czsky/en/star/hr4163.md

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---
name: U Hya
constellation: Hya
created_by: editor.cs
created_date: 2023-11-05 14:50:18.630507
updated_by: editor.cs
updated_date: 2023-11-05 14:50:18.630513
---
One of the brightest and most unusual carbon stars, whose red color can be seen even in the smallest telescope. This is due to the abundance of carbon molecules in its atmosphere, which absorb blue light. U Hya is observed 4 degrees northwest of the star ν Hydra and belongs to the irregular variable stars, whose magnitude fluctuates regularly from 4.7mag to 6.2mag in a period of about 450 days. It is located approximately 680 light-years away.