420356 Praamzius

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 2457800.5)
Uncertainty parameter 3
Observation arc 4746 days (12.99 yr)
Aphelion 43.029 AU (6.4370 Tm)
Perihelion 42.654 AU (6.3809 Tm)
42.842 AU (6.4091 Tm)
Eccentricity 0.00437
280.42 yr (102400 d)
188°
12.65 arcsec/day
Inclination 1.0943°
314.248°
353°
Earth MOID 41.6398 AU (6.22923 Tm)
Jupiter MOID 37.3927 AU (5.59387 Tm)
Physical characteristics
Dimensions 153-494 km
21.89–22.13
5.7[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. 1 2 "2012 BX85 - JPL Small Body Database". JPL (2015-01-17 last obs). NASA. Retrieved 25 March 2016.
    2. ↑ Brown, Mike. "How many dwarf planets are there in the Solar System". Retrieved 2 February 2015.
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