|Discovered by||Cyril Jackson at Union Observatory, South Africa and Grigory N. Neujmin at Simeis Observatory, Russia|
|Discovery date||20 September 1936 and 21 September 1936|
|Orbital characteristics A|
|Semi-major axis||4.0625 AU|
|Orbital period||8.19 yr|
|Next perihelion||2028-Sep-05 (JPL Horizons last obs 2020-05-27)|
The comet was discovered on a photographic plate on 20 September 1936 by Cyril Jackson of the Union Observatory, South Africa, who described it as faint and diffuse, with a brightness of magnitude 12. On the following day Grigory N. Neujmin of the Simeis Observatory, in Crimea, Russia discovered it independently. Fernand Rigaux of the Royal Observatory in Uccle, Belgium then also found it on an earlier photographic plate exposed on 9 September 1936.
The predicted 1945 apparition was not observed due to uncertainty about its position and appearance date and even Elizabeth Roemer was unable to find it in 1953. 1961 was again very difficult but Charles Kowal managed to relocate it in September, 1970. The 1995 appearance was more favourable and brightness reached a magnitude of 10. The comet wasn't observed during its 2004 or 2012 apparitions, and was thought to be potentially lost until it was successfully recovered in April 2020 at magnitude 12 by the Solar Wind Anisotropies (SWAN) camera on the Solar Heliospheric Observer (SOHO) spacecraft. Due to an outburst event the magnitude increased from 12 to 10 in late March 2020.
- "58P/Jackson-Neujmin". Retrieved 22 February 2015.
- "Elements and Ephemeris for 58P/Jackson-Neujmin". International Astronomical Union. Archived from the original on 4 March 2016. Retrieved 22 February 2015.
- "MPEC 2020-G76 : COMET 58P/Jackson-Neujmin". IAU Minor Planet Center. 2020-04-09. Retrieved 2020-07-03.
- Seiichi Yoshida (9 April 2020). "58P/Jackson-Neujmin (2020)". Retrieved 17 April 2020.
- "58P/Jackson-Neujmin plot at Comet Observation database (COBS)". Retrieved 2020-07-19.