C/1991 Y1 (Zanotta–Brewington)
Comet Zanotta–Brewington photographed from the Heidelberg Observatory on 24 January 1992. | |
| Discovery | |
|---|---|
| Discovered by | Mauro V. Zanotta Howard J. Brewington |
| Discovery site | Milan, Italy Cloudcroft, USA |
| Discovery date | 23–24 December 1991 |
| Designations | |
| 1992 III, 1991g1 | |
| Orbital characteristics | |
| Epoch | 10 January 1992 (JD 2448631.5) |
| Observation arc | 130 days |
| Number of observations | 266 |
| Aphelion | ~1,790 AU (outbound) |
| Perihelion | 0.644 AU |
| Semi-major axis | ~900 AU (outbound) |
| Eccentricity | 1.00005 (inbound) 0.99929 (outbound) |
| Orbital period | ~26,800 years (outbound) |
| Inclination | 50.028° |
| 254.91° | |
| Argument of periapsis | 197.87° |
| Mean anomaly | –1.791° |
| Last perihelion | 31 January 1992 |
| Earth MOID | 0.319 AU |
| Jupiter MOID | 1.670 AU |
| Physical characteristics | |
| Comet total magnitude (M1) | 10.2 |
| Comet nuclear magnitude (M2) | 17.0 |
| 7.3 (1992 apparition) | |
Comet Zanotta–Brewington, formally designated as C/1991 Y1, is a non-periodic comet that was observed telescopically between December 1991 and May 1992. It was discovered independently by both astronomers, Mauro V. Zanotta and Howard J. Brewington.