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Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, appearing roughly every 74–79 years. It last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061. Officially designated 1P/Halley, it is also commonly called Comet Halley, or sometimes simply Halley.
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comet halley's halley comets apparition sun also orbit observations perihelion years may earth au 1986 appeared first solar nucleus tail
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Halley's Comet | Alternative designations | Various (See Apparitions) | 1.00 | infobox |
| Halley's Comet | Aphelion | 35.14 au | 1.00 | infobox |
| Halley's Comet | Apparent magnitude | 2.1 (1986 apparition) | 1.00 | infobox |
| Halley's Comet | Argument of periapsis | 112.05° | 1.00 | infobox |
| Halley's Comet | Comet nuclear magnitude (M2) | 13.6 | 1.00 | infobox |
| Halley's Comet | Comet total magnitude (M1) | 5.5 | 1.00 | infobox |
| Halley's Comet | Dimensions | 14.42 km × 7.4 km × 7.4 km (Giotto) 15.3 km × 7.22 km × 7.22 km (Vega) | 1.00 | infobox |
| Halley's Comet | Discovered by | Edmond Halley[a] (recognition of periodicity) | 1.00 | infobox |
| Halley's Comet | Discovery date | 25 December 1758 (first predicted return) | 1.00 | infobox |
| Halley's Comet | Earliest precovery date | May 240 BC | 1.00 | infobox |
| Halley's Comet | Earth MOID | 0.075 au | 1.00 | infobox |
| Halley's Comet | Eccentricity | 0.96658 | 1.00 | infobox |
| Halley's Comet | Epoch | 4 August 2061 (JD 2474040.5) | 1.00 | infobox |
| Halley's Comet | Escape velocity | ~0.002 km/s | 1.00 | infobox |
| Halley's Comet | Geometric albedo | 0.04 | 1.00 | infobox |
| Halley's Comet | Inclination | 161.96° | 1.00 | infobox |
| Halley's Comet | Jupiter MOID | 0.783 au | 1.00 | infobox |
| Halley's Comet | Last perihelion | 8 February 1986 | 1.00 | infobox |
| Halley's Comet | Longitude of ascending node | 59.396° | 1.00 | infobox |
| Halley's Comet | Mass | (2.2±0.9)×1014 kg | 1.00 | infobox |
| Halley's Comet | Mean anomaly | 0.07323° | 1.00 | infobox |
| Halley's Comet | Mean density | 0.55±0.25 g/cm3 | 1.00 | infobox |
| Halley's Comet | Mean density | 0.2–1.5 g/cm3 (est.) | 1.00 | infobox |
| Halley's Comet | Mean diameter | 11 km (6.8 mi) | 1.00 | infobox |
| Halley's Comet | Next perihelion | 28 July 2061 | 1.00 | infobox |
| Halley's Comet | Next perihelion | ≈27 March 2134 | 1.00 | infobox |
| Halley's Comet | Number of observations | 8,518 | 1.00 | infobox |
| Halley's Comet | Observation arc | 2,243 years | 1.00 | infobox |
| Halley's Comet | Orbital period | 74.7 years | 1.00 | infobox |
| Halley's Comet | Perihelion | 0.59278 au | 1.00 | infobox |
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