1P/Halley Comet
1P/Halley — comet with 75.32-year orbit, 11 km nucleus. First confirmed periodic comet (predicted by Edmund Halley, 1705). 11 km peanut-shaped nucleus with active jets. Mass…
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| Nucleus size | 11 km |
|---|---|
| Orbital period | 75.32 years |
| Perihelion | 0.586 AU |
| Aphelion | 35.08 AU |
| Eccentricity | 0.9671 |
| Discovered | 240 BC |
| Next perihelion | 2061-Jul-28 |
| Composition | H2O ice, CO2 ice, CO ice, Dust, Organic compounds |
Details
First confirmed periodic comet (predicted by Edmund Halley, 1705). 11 km peanut-shaped nucleus with active jets. Mass ~2.2×10¹⁴ kg, density ~0.6 g/cm³ (rubble pile). Rich in volatiles: H₂O, CO₂, CO with organic compounds. 1986 fleet (Vega 1/2, Giotto, Suisei, Sakigake) revealed surface albedo ~0.04 (one of darkest objects in solar system). D/H ratio in water ~3× Earth's oceans, suggesting cometary water alone cannot explain Earth's ocean origin. Potential ISRU target for water extraction at perihelion (0.586 AU), but retrograde orbit (i=162°) makes rendezvous ΔV ~50 km/s — extremely challenging.
Sources / 数据来源
JPL Small-Body Database / IAU Minor Planet Center