420356 Praamzius
420356 Praamzius (provisional designation 2012 BX85) is a trans-Neptunian object from the classical Kuiper belt, located in the outermost region of the Solar System, approximately 190–320 kilometers (120–200 miles) in diameter. It was discovered on 23 January 2012, by astronomers Kazimieras Černis and Richard Boyle with the Vatican's VATT at Mount Graham Observatory in Arizona, United States. The cold classical Kuiper belt object is a weak dwarf planet candidate and possibly very red in color. It was named after the chief god Praamžius from Lithuanian mythology.
| Discovery | |
|---|---|
| Discovered by | K. Černis R. P. Boyle |
| Discovery site | VATT (Mount Graham Obs.) |
| Discovery date | 23 January 2012 |
| Designations | |
MPC designation | (420356) Praamzius |
| Pronunciation | /preɪˈæmziəs/ (Lithuanian: [prɐˈâmʑʊs]) |
Named after | Praámžius (Lithuanian mythology) |
Alternative designations | 2012 BX85 |
Minor planet category | TNO · cubewano cold · distant |
| Adjectives | Praamzinian |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 13.08 yr (4,778 d) |
| Aphelion | 43.027 AU |
| Perihelion | 42.147 AU |
Semi-major axis | 42.587 AU |
| Eccentricity | 0.0103 |
Orbital period (sidereal) | 277.93 yr (101,512 d) |
Mean anomaly | 185.10° |
Mean motion | 0° 0m 12.6s / day |
| Inclination | 1.1001° |
Longitude of ascending node | 314.26° |
| ≈ 12 June 2158 ±3 months | |
| 358.38° | |
| Physical characteristics | |
Mean diameter | 191 km (est.) 321 km (est.) |
| 0.09 (assumed) 0.20 (assumed) | |
| 22.09 (visible) | |
| 5.7 | |
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