C/1935 A1 (Johnson)
Long-period comet
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Johnson's Comet, formally designated as C/1935 A1, is a long-period comet with a 900-year orbit around the Sun. It is the first of four comets discovered by South African astronomer, Ernest Leonard Johnson.
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Discoverydate7 January 1935
1935a[3]
1935 I
1935 I
Comet Johnson photographed by George van Biesbroeck shortly after perihelion on 27 February 1935[1] | |
| Discovery[2] | |
|---|---|
| Discovered by | Ernest Leonard Johnson |
| Discovery site | Union Observatory |
| Discovery date | 7 January 1935 |
| Designations | |
| 1935a[3] 1935 I | |
| Orbital characteristics[4] | |
| Epoch | 28 February 1935 (JD 2427861.5) |
| Observation arc | 68 days |
| Number of observations | 34 |
| Aphelion | ~190 AU |
| Perihelion | 0.811 AU |
| Semi-major axis | 93.21 AU |
| Eccentricity | 0.99130 |
| Orbital period | ~900 years |
| Inclination | 65.424° |
| 92.445° | |
| Argument of periapsis | 18.399° |
| Mean anomaly | 0.002° |
| Last perihelion | 26 February 1935 |
| Next perihelion | ~2830s |
| TJupiter | 0.519 |
| Earth MOID | 0.149 AU |
| Jupiter MOID | 2.175 AU |
| Physical characteristics[5] | |
| Comet total magnitude (M1) | 9.5 |
| Comet nuclear magnitude (M2) | 12.5 |
| 8.4 (1935 apparition) | |
