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Io

Io Moon Gemini Visible Level 3 Medium telescope (6-8") - Timing dependent
Credit: NASA / JPL / University of Arizona. License: Public domain. (Wikimedia Commons)
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Properties

Magnitude 5.0
Angular Size 1.2 arcmin
Distance 421567 ly
Type: Moon
Distance: 0.003 AU
Orbital Period: 1.8 days
Diameter: 1,822 km
Atmosphere: Sulfur dioxide
Features: Volcanoes, lava flows
Most volcanically active body.

Position & Identifiers

RA 07h 04m 30.8s
Dec +22° 58' 03.7"
Constellation Gemini
Catalog Io

Visibility

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Community Photos (1)

Credit: NASA / JPL / University of Arizona. License: Public domain. (Wikimedia Commons)

Credit: NASA / JPL / University of Arizona. License: Public domain. (Wikimedia Commons)

Skybred Feb 28, 2026