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.
 The comet on 27 January 2020 by ZTF | |
| Discovery | |
|---|---|
| Discovered by | T. Niijima and T. Urata |
| Discovery date | October 30, 1986 |
| Designations | |
| 1986 UD, 1993 U1 | |
| Orbital characteristics | |
| Epoch | November 1, 2006 |
| Perihelion | 1.465 AU |
| Semi-major axis | 3.542 AU |
| Eccentricity | 0.586 |
| Orbital period | 6.67 a |
| Inclination | 24.1675° |
| Last perihelion | February 7, 2020[1] June 24, 2013[2] October 29, 2006 |
| Next perihelion | 2026-Sep-21[3] |
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]
References
edit- ^ "112P/Urata-Niijima Orbit". Minor Planet Center. Retrieved 2014-06-17.
- ^ Syuichi Nakano (2010-04-08). "112P/Urata-Niijima (NK 1906)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-24.
- ^ "Horizons Batch for 112P/Urata–Niijima (90000986) on 2026-Sep-21" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 2023-07-06. (JPL#35 Soln.date: 2021-Sep-20)
- ^ Lamy, P. L.; Toth, I.; Weaver, H. A.; A'Hearn, M. F.; Jorda, L. (December 2009). "Properties of the nuclei and comae of 13 ecliptic comets from Hubble Space Telescope snapshot observations". Astronomy & Astrophysics. 508 (2): 1045–1056. Bibcode:2009A&A...508.1045L. doi:10.1051/0004-6361/200811462. S2CID 125249770.
External links
edit- 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
 | This comet-related article is a stub. You can help Wikipedia by expanding it. |