2012 UE34


2012 UE34
Discovered byPan-STARRS 1
Discovery siteHaleakala Obs.
Discovery date18 October 2012
(first observed only)
2012 UE34
Orbital characteristics[2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter
Observation arc7.06 yr (2,578 d)
Aphelion1.2151 AU
Perihelion0.9956 AU
1.1053 AU
1.16 yr (424 d)
0° 50m 53.16s / day
Earth MOID0.000919 AU (0.358 LD)
Physical characteristics
Mean diameter
66 m (est. at 0.20)[3]
130 m (est. at 0.05)[3]

2012 UE34 is a sub-kilometer asteroid, classified as a near-Earth object of the Apollo group, approximately 70 meters (230 feet) in diameter. It was first observed on 18 October 2012, by Pan-STARRS at Haleakala Observatory on the island of Maui, Hawaii, in the United States.[1] The object was removed from the Sentry Risk Table on 29 December 2013.[4] On 8 April 2041 it will pass Earth at a nominal distance of 0.29 LD (0.0007329 AU). Due to its presumed small size, it does not qualify as a potentially hazardous asteroid, despite its low Earth MOID.[2]

Orbit and classification

2012 UE34 is an Apollo asteroid, which are Earth-crossers and the largest subgroup in the near-Earth object population. It orbits the Sun at a distance of 0.996–1.22 AU once every 14 months (424 days; semi-major axis of 1.11 AU). Its orbit has an eccentricity of 0.10 and an inclination of 10° with respect to the ecliptic.[2] The body's observation arc begins with its official first observation at Haleakala in October 2012.[1]

Close encounters

2012 UE34 passed about 300,000 km; 190,000 mi (0.002 AU) from Earth on 8 April 1991.[2] On 8 April 2041, the asteroid will pass about 100,000 km; 65,000 mi (0.0007 AU) from Earth. For comparison, the distance to the Moon is about 0.0026 AU (384,400 km).

It has an exceptionally low minimum orbital intersection distance with Earth of 0.000919 AU (137,500 km), which translates into 0.36 lunar distances. Despite this exceptionally low theoretical distance, the asteroid is not listed as a potentially hazardous asteroid, due to its small size, represented by its proxy, an absolute magnitude of 23.3, which is too faint and above the defined threshold of 22 magnitude.[2]

Numbering and naming

This minor planet has not been numbered by the Minor Planet Center and remains unnamed.[1]

Physical characteristics

Based on a generic magnitude-to-diameter conversion, 2012 UE34 measures 66 meters in diameter, for an absolute magnitude of 23.3 and an assumed albedo of 0.20, which is typical for stony S-type asteroids. In the unusual case of being a carbonaceous asteroid with a low albedo of 0.05, 2012 UE34 may be as large as 130 meters in diameter.[3]


  1. ^ a b c d e f g "2012 UE34". Minor Planet Center. Retrieved 16 January 2020.
  2. ^ a b c d e f g h "JPL Small-Body Database Browser: (2012 UE34)" (2019-11-09 last obs.). Jet Propulsion Laboratory. Retrieved 16 January 2020.
  3. ^ a b c "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 9 February 2018.
  4. ^ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Archived from the original on 2 June 2002.

External links

  • MPEC 2012-U61 : 2012 UE34, Minor Planet Electronic Circular, 20 October 2012
  • MPEC 2019-N158 : 2012 UE34, Minor Planet Electronic Circular, 14 July 2019
  • Minor Planet Center: Asteroid Hazards, Part 3: Finding the Path on YouTube (min. 5:38), includes discussion of 2012 UE34
  • 2012 UE34 at NEODyS-2
  • Physical facts sheet, European Asteroid Research Node (EARN), 18 October 2012
  • List Of The Potentially Hazardous Asteroids (PHAs), Minor Planet Center
  • 2012 UE34 at NeoDyS-2, Near Earth Objects—Dynamic Site
    • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
  • 2012 UE34 at ESA–space situational awareness
    • Ephemerides · Observations · Orbit · Physical Properties · Summary
  • 2012 UE34 at the JPL Small-Body Database Edit this at Wikidata
    • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters
Preceded by Large NEO Earth close approach
(inside the orbit of the Moon)

8 April 2041
Succeeded by