21785 Méchain
| Discovery | |
|---|---|
| Discovered by | Milos Tichý |
| Discovery site | Kleť Observatory |
| Discovery date | on 21 September 1999 |
| Designations | |
Named after | Pierre Méchain |
| main belt | |
| Orbital characteristics[1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 14387 days (39.39 yr) |
| Aphelion | 3.2531798 AU (486.66877 Gm) |
| Perihelion | 2.3027130 AU (344.48096 Gm) |
| 2.7779464 AU (415.57487 Gm) | |
| Eccentricity | 0.1710736 |
| 4.63 yr (1691.2 d) | |
| 173.40804° | |
| 0° 12m 46.339s / day | |
| Inclination | 18.660257° |
| 22.910863° | |
| 359.02780° | |
| Earth MOID | 1.30441 AU (195.137 Gm) |
| Jupiter MOID | 2.20309 AU (329.578 Gm) |
| Jupiter Tisserand parameter | 3.237 |
| Physical characteristics | |
| 14.7 | |
|
| |
21785 Méchain is a main belt asteroid with an orbital period of 1691.95 days (4.63 a).[2]
The asteroid was discovered by Milos Tichý at Kleť Observatory on 21 September 1999, and provisionally designated as 1999 SS2.
On 24 June 2002, It was named in honor of a French astronomer and surveyor Pierre Méchain who with Charles Messier, was a major contributor to the early study of deep sky objects and comets.
References
- ↑ "JPL Small-Body Database Browser: 21785 Méchain". Retrieved 12 April 2016.
- ↑ "JPL Small-Body Database Browser". NASA. Retrieved 2012-11-27.
External links
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