<Table> 1P / Halley (Halley's Comet) <Tr> <Td_colspan="2"> Halley's Comet on 8 March 1986 </Td> </Tr> <Tr> <Th_colspan="2"> Discovery </Th> </Tr> <Tr> <Th> Discovered by </Th> <Td> Prehistoric observation; Edmond Halley (recognition of periodicity) </Td> </Tr> <Tr> <Th_colspan="2"> Orbital characteristics </Th> </Tr> <Tr> <Td_colspan="2"> Epoch 17 February 1994 (2449400.5) </Td> </Tr> <Tr> <Th> Aphelion </Th> <Td> 35.082 AU </Td> </Tr> <Tr> <Th> Perihelion </Th> <Td> 0.586 AU last perihelion: 9 February 1986 next perihelion: 28 July 2061 </Td> </Tr> <Tr> <Th> Semi-major axis </Th> <Td> 17.834 AU </Td> </Tr> <Tr> <Th> Eccentricity </Th> <Td> 0.96714 </Td> </Tr> <Tr> <Th> Orbital period </Th> <Td> 75.32 yr </Td> </Tr> <Tr> <Th> Mean anomaly </Th> <Td> 38.38 ° </Td> </Tr> <Tr> <Th> Inclination </Th> <Td> 162.26 ° </Td> </Tr> <Tr> <Th> Longitude of ascending node </Th> <Td> 58.42 ° </Td> </Tr> <Tr> <Th> Argument of perihelion </Th> <Td> 111.33 ° </Td> </Tr> <Tr> <Th> Earth MOID </Th> <Td> 0.0638 AU (9.54 million km) </Td> </Tr> <Tr> <Th_colspan="2"> Physical characteristics </Th> </Tr> <Tr> <Th> </Th> <Td> 15 × 8 km, 11 km (mean diameter) </Td> </Tr> <Tr> <Th> Mass </Th> <Td> 2.2 × 10 kg </Td> </Tr> <Tr> <Th> Mean density </Th> <Td> 0.6 (estimates range from 0.2 to 1.5 g / cm) </Td> </Tr> <Tr> <Th> Escape velocity </Th> <Td> ~ 0.002 km / s </Td> </Tr> <Tr> <Th> Sidereal rotation period </Th> <Td> 2.2 d (52.8 h) (?) </Td> </Tr> <Tr> <Th> Albedo </Th> <Td> 0.04 </Td> </Tr> <Tr> <Th> Apparent magnitude </Th> <Td> 28.2 (in 2003) </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Halley's Comet on 8 March 1986 </Td> </Tr>

Halley's comet distance from the sun in au
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