# What is the angular diameter of Jupiter’s moon Io when observing it from a spacecraft located at a distance of 576,000 km

September 16, 2020 | Education

| **What is the angular diameter of Jupiter’s moon Io when observing it from a spacecraft located at a distance of 576,000 km from the satellite, if it is known that the linear dimensions of Io and the Moon are almost the same.**

If we know the angular diameter of the Moon (32 ‘) and the distance to it 384000 km, then

32 ‘/ (576000/384000) = 21’

If we know the linear diameter of the Moon is 3474 km, then 3474/576000 = 0.0060313 rad = 0.3456 ° = 20.7 ‘

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