420356 Praamzius
| Discovery | |
|---|---|
| Discovered by |
K. Černis R. P. Boyle |
| Discovery site | Mount Graham Obs. |
| Discovery date | 23 January 2012 |
| Designations | |
| MPC designation | (420356) 2012 BX85 |
| trans-Neptunian object (near-3:5 resonance) | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 4746 days (12.99 yr) |
| Aphelion | 43.027 AU (6.4367 Tm) |
| Perihelion | 42.754 AU (6.3959 Tm) |
| 42.891 AU (6.4164 Tm) | |
| Eccentricity | 0.00318 |
| 280.90 yr (102600 d) | |
| 183° | |
| 0.0035088°/day | |
| Inclination | 1.0927° |
| 314.248° | |
| 357° | |
| Earth MOID | 41.7394 AU (6.24413 Tm) |
| Jupiter MOID | 37.4654 AU (5.60474 Tm) |
| Physical characteristics | |
| Dimensions |
200 km (assumed albedo of 0.2) |
| 21.89–22.13 | |
| 5.6[1] | |
|
| |
420356 Praamzius is a trans-Neptunian object (TNO) and possibly a dwarf planet[2] in the Kuiper belt. It has the second-lowest eccentricity of any TNO, after 2003 YN179. Praamzius orbits near the 3:5 resonance with Neptune, but it takes about 160 Neptune orbits (26,500 years) to make an orbit less than would be expected of an object in a true 3:5 resonance. It was discovered on 23 January 2012, with precovery observations accepted by the Minor Planet Center dating back to December 2011, with possible precovery observations dating back to 2004 that have yet to be accepted. It was officially named on 22 February 2016 after the Lithuanian god of the sky, peace, and friendship.
Praamzius is one of the most recently discovered minor planets that have been given a numeric designation, most likely because of the large number of observations, on average about one every 10 days, since it was discovered. All of the observations, except 6 in February 2013, were made by the Mount Graham Observatory, the discovery site.
Analysis of precovery observations of Praamzius from 2002, 2003, 2004, and 2007, show that it is probably one of the reddest objects in the solar system, being more than 1.5 magnitudes fainter measured in the G (green) filter than the R (red) filter.
References
- 1 2 "2012 BX85 - JPL Small Body Database". JPL (2015-01-17 last obs). NASA. Retrieved 25 March 2016.
- ↑ Brown, Mike. "How many dwarf planets are there in the Solar System". Retrieved 2 February 2015.
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