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Callisto

Callisto Moon Gemini Visible Level 3 Medium telescope (6-8") - Timing dependent
Credit: zelario12. License: CC BY-SA 2.0. (Wikimedia Commons)
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Properties

Magnitude 5.7
Angular Size 1.5 arcmin
Type: Moon
Distance: 0.013 AU
Orbital Period: 16.7 days
Diameter: 2,410 km
Atmosphere: Thin carbon dioxide
Features: Craters, valhalla
Heavily cratered surface.

Position & Identifiers

RA 07h 06m 47.2s
Dec +22° 55' 57.4"
Constellation Gemini
Catalog Callisto
Callisto — NASA/JPL
Image: NASA/JPL · PIA03456

Physical Properties

Diameter 2,410 km (0.19× Earth)
Mass 1.08e23 kg
Albedo 0.19 (19% reflected)
Temperature -193°C to -139°C
Rotation 16.7 days
Atmosphere Thin carbon dioxide
Surface Craters, valhalla
Angular Size 0.7″ (current)

Orbital Properties

Semi-major Axis 0.0126 AU (1,881,941 km)
Eccentricity 0.0070
Inclination 0.30°
Orbital Period 16.7 days
Distance 5.025 AU (41.8 light-min)
Elongation 96.9° Good

Observing Tips

Best Months May , June , July
Visibility Binoculars
Where to Look Near Jupiter
Notes Heavily cratered surface.

Parent Body

Orbits Jupiter
Orbital Period 16.69 days
Distance 1,881,941 km

Discovery

Discovered by Galileo Galilei
Date 1610

Current Ephemeris

5.025
AU from Earth
751.8M
km
0.7″
Angular Size
97°
Elongation

Visibility

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Community Photos (1)

Credit: zelario12. License: CC BY-SA 2.0. (Wikimedia Commons)

Credit: zelario12. License: CC BY-SA 2.0. (Wikimedia Commons)

Skybred Feb 28, 2026

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