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References
- 1 2 3 "51P/Harrington Orbit". Minor Planet Center. Archived from the original on 2022-06-20.
- ↑ "Horizons Batch for 51P-D (90000595) on 2022-Oct-01" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Archived from the original on 2022-06-20. Retrieved 2022-07-06. (JPL#K222/5 Soln.date: 2023-May-04)
- ↑ Seiichi Yoshida (2016-05-14). "51P/Harrington". Seiichi Yoshida's Comet Catalog. Retrieved 2017-02-26.
- ↑ "Horizons Batch for 51P-A/Harrington (90000593) for Aug-Oct 2022". JPL Horizons. Archived from the original on 2022-06-21. Retrieved 2022-06-21. (JPL#K153/2, Soln.date: 2015-Oct-07)
- ↑ "Horizons Batch for 51P-A/Harrington (90000593) on 2022-Oct-03" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Archived from the original on 2022-06-20. Retrieved 2022-06-20. (JPL#K153/2, Soln.date: 2015-Oct-07)
- ↑ "Horizons Batch for 51P-D (90000595) for Aug-Oct 2022". JPL Horizons. Archived from the original on 2022-06-21. Retrieved 2022-07-06. (JPL#K222/5 Soln.date: 2023-May-04
- Mobberley, Martin. Hunting and Imaging Comets. Google Books
