|Discovered by||Robert G. Harrington at Palomar Observatory|
|Discovery date||14 August 1953|
|Orbital characteristics A|
|Aphelion||5.729 AU (Q)|
|Perihelion||1.699 AU (q)|
|Semi-major axis||3.714 AU (a)|
|Orbital period||7.16 yr|
|Last perihelion||12 August 2015|
18 June 2008
|Next perihelion||2022-Oct-01 (MPC)|
2022-Oct-03 (JPL Horizons)
It was discovered by Robert George Harrington at Palomar Observatory on 14 August 1953 using the Schmidt telescope. It then had a brightness of magnitude 15. In October 1956 its orbit was affected by the planet Jupiter and on its next return in 1960 the brightness had fallen to magnitude 20. By 1980 it had slightly improved to magnitude 18. It has a period of approximately 7 years.
In 1987 and 1994 brightness had significantly increased to magnitude 12. In 1994 Jim Scotti at Kitt Peak Observatory observed that the comet had broken up and that two detached pieces were accompanying the main body, which explained the improvement in the brightness. By 2001 further splitting had occurred.