C/1983 H1 (IRAS–Araki–Alcock)
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Comet IRAS–Araki–Alcock photographed by Russell E. Milton on 11 May 1983 | |
| Discovery | |
|---|---|
| Discovered by | IRAS George E. D. Alcock Genichi Araki |
| Discovery date | 25 April 1983 |
| Designations | |
| 1983d 1983 VII | |
| Orbital characteristics | |
| Epoch | 13 May 1983 (JD 2445467.5) |
| Observation arc | 160 days |
| Number of observations | 347 |
| Aphelion | 195.08 AU |
| Perihelion | 0.9913 AU |
| Semi-major axis | 98.034 AU |
| Eccentricity | 0.98989 |
| Orbital period | 970.49 years |
| Inclination | 73.251° |
| 49.102° | |
| Argument of periapsis | 192.85° |
| Last perihelion | 21 May 1983 |
| TJupiter | 0.408 |
| Earth MOID | 0.0058 AU |
| Jupiter MOID | 3.0838 AU |
| Physical characteristics | |
| Dimensions | 9.2 km (5.7 mi) |
| 51.3±0.3 hours | |
| 0.02 | |
| Comet total magnitude (M1) | 12.6 |
| 3–4 (1983 apparition) | |
Comet IRAS–Araki–Alcock (formal designation C/1983 H1, formerly 1983 VII) is a long-period comet that, in 1983, made the closest known approach to Earth of any comet in the last 200 years, at a distance of about 0.0312 AU (4.67 million km; 2.90 million mi).