Astronomy:2010 KZ39

2010 KZ₃₉

Discovery
Discovered by	A. Udalski S. S. Sheppard M. Szymanski C. Trujillo
Discovery site	Las Campañas Obs. (first observed)
Discovery date	21 May 2010 (first observed)
Designations
MPC designation	2010 KZ39
Minor planet category	TNO Detached (SDO-EXT)
Orbital characteristics
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 5
Observation arc	1.83 yr (669 days)
|{{{apsis}}}|helion}}	47.825 AU
|{{{apsis}}}|helion}}	42.965 AU
Semi-major axis	45.395 AU
Eccentricity	0.0535
Orbital period	305.86 yr (111,714 days)
Mean anomaly	256.31°
Mean motion	0° 0m 11.52s / day
Inclination	26.032°
Longitude of ascending node	53.118°
|{{{apsis}}}|helion}}	≈ 6 May 2110 ±5 months
|{{{apsis}}}|helion}}	313.91°
Physical characteristics
Geometric albedo	0.10 (assumed)
Apparent magnitude	20.7
Absolute magnitude (H)	4.0 4.03±0.01

2010 KZ₃₉ is a trans-Neptunian object orbiting the Sun as a detached object in the outer reaches of the Solar System. The object was first observed on 21 May 2010 by astronomers Andrzej Udalski, Scott Sheppard, M. Szymanski and Chad Trujillo at the Las Campañas Observatory in Chile.

Description

Follow-up images of 2010 KZ₃₉ taken at Las Campañas Obs.

2010 KZ₃₉ orbits the Sun at a distance of 42.9–47.8 AU once every 305 years and 3 months (111,504 days), similar to Makemake, Chaos and other bodies that circle the Sun in 6:11 resonance to Neptune. Its orbit has an eccentricity of 0.05 and an inclination of 26° with respect to the ecliptic.

Using the best-fit values for its orbit, it is expected to come to perihelion in 2109. It has been observed 28 times over 3 oppositions and has an uncertainty parameter of 5. As of 2016, is 46.1 AU from the Sun. The body's spectral type as well as its rotation period remain unknown.

Brown assumes an albedo of 0.09 and magnitude of 4.5, resulting in an estimated diameter of 574 kilometers. However, because the albedo is unknown and it has a currently estimated absolute magnitude of 4.03±0.01, its diameter could easily fall between 414 and 933 km for an assumed albedo between 0.25 and 0.05, respectively.

External links

• Large New Trans-Neptunian Object 2010 KZ₃₉ Discovered (BAA Blog : 9 June 2010)
• OCKS: OGLE Carnegie Kuiper belt Survey (OCKS is a Southern sky survey searching for Kuiper Belt objects and dwarf planets)
• 2010 KZ39 at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 2010 KZ39 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters