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2010 KZ39

2010 KZ39
Discovery [1][2]
Discovered byA. Udalski
S. S. Sheppard
M. Szymanski
C. Trujillo
(all unaccredited)
Discovery siteLas Campañas Obs.
(first observed)
Discovery date21 May 2010
(first observed)
MPC designation2010 KZ39
TNO[3] · Detached (SDO-EXT)[4]
Orbital characteristics[3][4]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 5
Observation arc1.83 yr (669 days)
Aphelion47.825 AU
Perihelion42.965 AU
45.395 AU
305.86 yr (111,714 days)
0° 0m 11.52s / day
Physical characteristics
Dimensions666.04 km (with H=4.0 and assuming 0.10 albedo)[5]
413.6–933.3 km (for H=4.03±0.01, 0.25~0.05 albedo)[6][7]
574 km (est. at 0.09 and H=4.5)[8]
0.10 (assumed)[5]

2010 KZ39 is a trans-Neptunian object orbiting the Sun as a detached object in the outer reaches of the Solar System. It is likely a dwarf planet as it measures approximately 600 kilometers in diameter.[10][8][5] 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.[1]


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.[3] It has been observed 28 times over 3 oppositions and has an uncertainty parameter of 5.[1] As of 2016, is 46.1 AU from the Sun.[9] 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.[8] However, because the albedo is unknown and it a currently estimated absolute magnitude of 4.03±0.01[7], its diameter could easily fall between 414 and 933 km[6] for an assumed albedo between 0.25 and 0.05, respectively.


  1. ^ a b c "(2010 KZ39)". Minor Planet Center. Retrieved 21 September 2016.
  2. ^ "MPEC 2010-L38 : 2010 KZ39". IAU Minor Planet Center. 8 June 2010. Retrieved 3 December 2010.
  3. ^ a b c d "JPL Small-Body Database Browser: (2010 KZ39)" (2012-03-20 last obs.). Jet Propulsion Laboratory. Retrieved 3 April 2017.
  4. ^ a b Marc W. Buie. "Orbit Fit and Astrometric record for 10KZ39" (last observation: 2012-03-20 using 28 of 28 observations over 1.83 years). SwRI (Space Science Department). Retrieved 18 August 2011.
  5. ^ a b c d "LCDB Data for 2010 KZ39". Asteroid Lightcurve Database (LCDB). Retrieved 3 April 2017.
  6. ^ a b Dan Bruton. "Conversion of Absolute Magnitude to Diameter for Minor Planets". Department of Physics & Astronomy (Stephen F. Austin State University). Archived from the original on 23 July 2011. Retrieved 18 August 2011.
  7. ^ a b c Benecchi, Susan D.; Sheppard, Scott S. (May 2013). "Light Curves of 32 Large Transneptunian Objects". The Astronomical Journal. 145 (5): 19. arXiv:1301.5791. Bibcode:2013AJ....145..124B. doi:10.1088/0004-6256/145/5/124. Retrieved 3 April 2017.
  8. ^ a b c Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 14 August 2019.
  9. ^ a b "AstDyS: 2010 KZ39 Ephemerides". AstDyS. Retrieved 7 April 2014.
  10. ^ "Absolute Magnitude (H)". NASA/JPL. Retrieved 19 July 2011.

External links