C/1935 A1 (Johnson)
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_on_27_February_1935.jpg) 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) | |
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.
Orbit
[edit]Between February and March 1936, Allan D. Maxwell calculated that the comet had an orbital period of 750 years, later revised to 896 years.[6][7] This is a follow-up to the preliminary parabolic solutions that were first calculated by J. P. Möller and H. Q. Rassumen a year prior.[5]
References
[edit]- ↑ G. van Biesbroeck (1935). "Comet Notes". Popular Astronomy. 43: 254–255. Bibcode:1935PA.....43..254V.
- ↑ "First Comet of 1935" (PDF). Nature. 135: 115. 1935. doi:10.1038/135115c0.
- ↑ "Comet Names and Designations". International Comet Quarterly. Retrieved 27 January 2025.
- ↑ "C/1935 A1 (Johnson) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 27 January 2025.
- 1 2 G. W. Kronk (2009). Cometography: A Catalog of Comets. Vol. 4: 1933–1959. Cambridge University Press. pp. 20–25. ISBN 978-0-521-58507-1.
- ↑ A. D. Maxwell (1936). "The Orbit of Comet 1935a". Astronomical Journal. 45 (1041): 49–54. Bibcode:1936AJ.....45...49M. doi:10.1086/105322.
- ↑ A. D. Maxwell (1937). "Elements and Ephemeris of Comet 1935a (Johnson)". Publications of the Observatory of the University of Michigan. 6 (7): 63–65. Bibcode:1937POMic...6...63M.
External links
[edit]- C/1935 A1 at the JPL Small-Body Database
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