112P/Urata–Niijima Explained

112P/Urata-Niijima
Discoverer:	T. Niijima and T. Urata
Discovery Date:	October 30, 1986
Designations:	1986 UD, 1993 U1
Epoch:	November 1, 2006
Perihelion:	1.465 AU
Semimajor:	3.542 AU
Eccentricity:	0.586
Period:	6.67 a
Inclination:	24.1675°
Last P:	February 7, 2020^[1] June 24, 2013^[2] October 29, 2006
Next P:	2026-Sep-21^[3]

Comet Urata-Niijima is a periodic comet in the Solar System discovered by Japanese astronomers Tsuneo Niijima and Takeshi Urata on October 30, 1986, at Ojima, the first orbit was calculated by Brian G. Marsden on November 5 giving an orbital period of 6.42 years.

On October 20, 1993, the comet was recovered by J. V. Scotti (Spacewatch, Kitt Peak Observatory, Arizona, United States), and on the next return on March 4, 2000, by Philippe. L. Lamy and Harold. A. Weaver using the Hubble Space Telescope.

The nucleus of the comet has a radius of 0.90 ± 0.05 kilometers, assuming a geometric albedo of 0.04.^[4]

External links

• Orbital simulation from JPL (Java) / Horizons Ephemeris
• 112P at Kronk's Cometography
• 112P at Kazuo Kinoshita's Comets
• 112P at Seiichi Yoshida's Comet Catalog

Notes and References

1. Web site: 112P/Urata-Niijima Orbit . . 2014-06-17.
2. Web site: 2010-04-08 . 112P/Urata-Niijima (NK 1906) . OAA Computing and Minor Planet Sections . Syuichi Nakano . Syuichi Nakano . 2012-02-24.
3. Web site: Horizons Batch for 112P/Urata–Niijima (90000986) on 2026-Sep-21 . . Perihelion occurs when rdot flips from negative to positive . 2023-07-06. (JPL#35 Soln.date: 2021-Sep-20)
4. Lamy . P. L. . Toth . I. . Weaver . H. A. . A'Hearn . M. F. . Jorda . L. . Properties of the nuclei and comae of 13 ecliptic comets from Hubble Space Telescope snapshot observations . Astronomy & Astrophysics . December 2009 . 508 . 2 . 1045–1056 . 10.1051/0004-6361/200811462. 2009A&A...508.1045L . 125249770 . free .