8. Halley's Comet
Comet Halley.
Comet Halley in 1910 appearance.
Image by satellite Giotto of the nucleus of Comet Halley.
8. Halley's Comet

8. Halley's Comet


Comet

Diameter: 16x8x8 km (nucleus)
Orbit Radius: 0.586—17.8 AU
Orbital Period: 75.3 years
Rotational Period: 2.23 days
Average Temperature: Varies
Composition: Icy
Atmosphere: 80% H2O; 17% CO; 3% CO2
Magnetic Field: Unknown