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|Discovered by||Keith P. Tritton|
|Discovery date||February 11, 1978|
|Orbital characteristics A|
|Epoch||March 6, 2006|
|Semi-major axis||3.459 AU|
|Orbital period||6.433 a|
|Last perihelion||February 20, 2010|
|Next perihelion||June 10, 2016
Keith Tritton (U. K. Schmidt Telescope Unit, Coonabarabran) discovered this comet on a deep IIIa-J exposure made with the 122-cm Schmidt telescope on 1978 February 11.66. 
- The first orbit was calculated by M. P. Candy using positions obtained by Tritton on February 11, 13, and 15. It was an elliptical orbit with a perihelion date of 1977 October 30.07 and an orbital period of 7.30 years. B. G. Marsden revised the orbit using five positions spanning the period of February 11 to March 13. He also gave an elliptical orbit with a perihelion date of October 28.51 and an orbital period of 6.33 years.
- Apparition of 1978: Moonlight made observations impossible during the last half of February and during the early days of March; however, the comet was found by J. H. Bulger (Harvard Observatory's Agassiz Station) on March 10.27. He gave the nuclear magnitude as 20. The last three observations of the comet were obtained by Shao on March 11.28, 13.20, and 14.21. On IAU Circular No. 3194, issued on 1978 March 15, Marsden wrote, "It is possible that the comet experienced an outburst around the time of the Harvard observation on Feb. 15...." No observations were obtained thereafter.
- Syuichi Nakano (2012-03-24). "157P/Tritton (NK 1900)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-25.
- Horizons output. "Observer Table for Comet 157P/Tritton". Retrieved 2012-02-25. (Observer Location:@sun)
- Orbital simulation from JPL (Java) / Horizons Ephemeris
- 157P/Tritton – Seiichi Yoshida @ aerith.net
- 157P at Gary W. Kronk's Cometography
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