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Comet Donati, or Donati's Comet, formally designated C/1858 L1 and 1858 VI, is a long-period comet named after the Italian astronomer Giovanni Battista Donati who first observed it on June 2, 1858. After the Great Comet of 1811, it was the most brilliant comet that appeared in the 19th century. It was also the first comet to be photographed.
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Comet Donati | Alternative designations | 1858 VI | 1.00 | infobox |
| Comet Donati | Aphelion | ~289 AU | 1.00 | infobox |
| Comet Donati | Apparent magnitude | 0.0–1.0 (1858 apparition) | 1.00 | infobox |
| Comet Donati | Argument of periapsis | 129.144° | 1.00 | infobox |
| Comet Donati | Comet total magnitude (M1) | 3.3 | 1.00 | infobox |
| Comet Donati | Discovered by | Giovanni Battista Donati | 1.00 | infobox |
| Comet Donati | Discovery date | 1858 | 1.00 | infobox |
| Comet Donati | Eccentricity | 0.996295 | 1.00 | infobox |
| Comet Donati | Epoch | 8 October 1858 (JD 2399960.5) | 1.00 | infobox |
| Comet Donati | Inclination | 116.951° | 1.00 | infobox |
| Comet Donati | Last perihelion | 30 September 1858 | 1.00 | infobox |
| Comet Donati | Longitude of ascending node | 167.304° | 1.00 | infobox |
| Comet Donati | Mean radius | 2.96 km (1.84 mi)[a] | 1.00 | infobox |
| Comet Donati | Next perihelion | ≈3600 | 1.00 | infobox |
| Comet Donati | Number of observations | 1,000 | 1.00 | infobox |
| Comet Donati | Observation arc | 270 days | 1.00 | infobox |
| Comet Donati | Orbital period | ~1,739 yr (outbound) | 1.00 | infobox |
| Comet Donati | Perihelion | 0.578 AU | 1.00 | infobox |
| Comet Donati | Semi-major axis | ~145 AU | 1.00 | infobox |
| Comet Donati | Synodic rotation period | 4.6 hours | 1.00 | infobox |
| Comet Donati | TJupiter | –0.394 | 1.00 | infobox |
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