What is the approximate upper limit for easy naked-eye observation based on apparent magnitude?
Answer
Magnitude 6.0
The standard threshold used to quantify naked-eye visibility for stars is approximately magnitude 6.0. Stars with apparent magnitudes numerically larger than this value are considered too faint for the average person to see without assistance, even under optimal viewing conditions, such as being far from light pollution. UY Scuti's typical range of 6.8 to 7.1 places it firmly below this limit, which is why optical aid is required to locate it successfully.
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