216433 Milianleo

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216433 Milianleo
Asteroid Milianleo Animation.gif
Animation of Milianleo from Tzec Maun
Discovery [1]
Discovered by E. Schwab
Discovery site Tzec Maun Obs. (H10)
Discovery date 19 February 2009
MPC designation (216433) Milianleo
Named after
Milian Leo Schwab (discoverer's son)[2]
2009 DM3 · 2000 GE16
main-belt · (middle)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 16.71 yr (6,105 days)
Aphelion 3.1018 AU
Perihelion 2.3811 AU
2.7414 AU
Eccentricity 0.1314
4.54 yr (1,658 days)
0° 13m 1.56s / day
Inclination 3.3500°
Physical characteristics
Dimensions 2.0 km (est. at 0.1)[3]

216433 Milianleo, provisional designation 2009 DM3, is an asteroid from the middle region of the asteroid belt, approximately 2 kilometers in diameter. It was discovered 19 February 2009, by German amateur astronomer Erwin Schwab using a remote-controlled telescope at Tzec Maun Observatory in New Mexico, United States. The asteroid was named after the discoverer's son, Milian Leo Schwab.[2]

Orbit and classification[edit]

Milianleo orbits the Sun in the central main-belt at a distance of 2.4–3.1 AU once every 4 years and 6 months (1,658 days). Its orbit has an eccentricity of 0.13 and an inclination of 3° with respect to the ecliptic.[1] It was first observed as 2000 GE16 at Lincoln Laboratory ETS in 2000, extending the body's observation arc by 9 years prior to its official discovery at Tzec Maun.[2]

On 25 December 2098, Milianleo is expected to pass 4,449,642 kilometers from the asteroid 704 Interamnia.[1] It will pass it at a relative velocity of 7.12 kilometers per second.

Physical characteristics[edit]

Based on a generic absolute magnitude to diameter conversion, Milianleo measures approximately 2 kilometers in diameter, assuming an albedo of 0.10.[3] As of 2017, its spectral type as well as its rotation period and shape remain unknown.[1][4]


This minor planet was named after Milian Leo Schwab, the first-born son of German amateur astronomer and discoverer Erwin Schwab.[2][5] The approved naming citation was published by the Minor Planet Center 4 October 2009 (M.P.C. 67220).[6]

Orbit of Milianleo, close to its perihelion (Sept. 2013)

See also[edit]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 216433 Milianleo (2009 DM3)" (2016-12-22 last obs.). Jet Propulsion Laboratory. Retrieved 5 July 2017. 
  2. ^ a b c d "216433 Milianleo (2009 DM3)". Minor Planet Center. Retrieved 9 March 2017. 
  3. ^ a b "Conversion of Absolute Magnitude to Diameter for Minor Planets". Sephen F. Austin State University. Dan Burton. Archived from the original on 23 July 2011. Retrieved 26 November 2013. 
  4. ^ "LCDB Data for (216433) Milianleo". Asteroid Lightcurve Database (LCDB). Retrieved 5 July 2017. 
  5. ^ "Kleinplaneten Entdecker Erwin Schwab" [Minor-planet discoveries by Erwin Schwab at the Tzec Maun Observatories]. Erwin Schwab. Retrieved 23 August 2016. 
  6. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 9 March 2017. 

External links[edit]