C/1989 W1 (Aarseth–Brewington)
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| Discovery | |
|---|---|
| Discovered by | Knut Aarseth Howard J. Brewington |
| Discovery date | 16 November 1989 |
| Designations | |
| 1989a1 1989 XXII | |
| Orbital characteristics | |
| Epoch | 5 December 1989 (JD 2447865.5) |
| Observation arc | 151 days |
| Earliest precovery date | 1 September 1989 |
| Number of observations | 73 |
| Perihelion | 0.301 AU |
| Eccentricity | 1.00006 |
| Inclination | 88.386° |
| 345.917° | |
| Argument of periapsis | 205.259° |
| Last perihelion | 27 December 1989 |
| Earth MOID | 0.6678 AU |
| Jupiter MOID | 0.1682 AU |
| Physical characteristics | |
Mean radius | 0.817 km (0.508 mi) |
| Comet total magnitude (M1) | 7.6 |
| 2.8 (1989 apparition) | |
C/1989 W1 (Aarseth–Brewington) is a non-periodic comet discovered on 16 November 1989 independently by Knut Aarseth and Howard Brewington. It reached an apparent magnitude of 2.8.