2010 EL 139

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Asteroid
2010 EL 139
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type Plutino ,
"Distant Object"
Major semi-axis 39.575  AU
eccentricity 0.068
Perihelion - aphelion 36.889 AU - 42.261 AU
Inclination of the orbit plane 23 °
Length of the ascending node 331.2 °
Argument of the periapsis 212.8 °
Time of passage of the perihelion October 13, 1998
Sidereal period 248 a 11.5 M
Mean orbital velocity 4.696 km / s
Physical Properties
Medium diameter approx. 447 km
Albedo 0.06-0.09
Rotation period 6.32 h (0.263 d )
Absolute brightness 5.5 - 5.6 mag
history
Explorer Andrzej Udalski
Chadwick A. Trujillo
Scott S. Sheppard
Igor Soszyński
Date of discovery March 12, 2010
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

2010 EL 139 is a large trans-Neptunian object in the Kuiper belt , which is classified as Plutino in terms of orbital dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2010 EL 139 was discovered on March 12, 2010 by a team of astronomers consisting of Andrzej Udalski , Chad Trujillo , Scott Sheppard and Igor Soszyński at the 1.3 m telescope of the Las Campanas Observatory ( Chile ). The discovery was made as part of the Warsaw University's OGLE IV program . The discovery was announced on April 9, 2010.

The observation sheet of the asteroid begins with the official discovery observation on March 12, 2010. In September 2018, a total of 163 observations over a period of 8 years were available. The last observation so far was carried out in January 2018 with the Pan-STARRS telescope at the Haleakalā Observatory ( Maui ). (As of March 5, 2019)

properties

Orbit

2010 EL 139 orbits the sun in 248.96 years on a slightly elliptical orbit between 36.89  AU and 42.26 AU from its center. The orbit eccentricity is 0.068, the orbit is 23.00 ° inclined to the ecliptic . The planetoid is currently 37.29 AU from the Sun. The last time he went through perihelion was in 1998, the next perihelion should therefore take place in 2247.

Marc Buie ( DES ) classifies the planetoid as Plutino , while the Minor Planet Center does not have a specific classification; the latter classifies it as a non-SDO and generally as a “distant object” .

Size and rotation

A diameter of 447 km is currently assumed, based on a reflectivity of 6% and an absolute brightness of 5.5  m . Assuming a diameter of 447 km, this results in a total surface of around 628,000 km². The apparent brightness of 2010 EL 139 is 21.32  m , the mean surface temperature is estimated at 44 K (−229 ° C) based on the distance from the sun  .

Since it can be assumed that 2010 EL 139 is in hydrostatic equilibrium due to its size and therefore has to be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown believes that 2010 EL 139 may be a dwarf planet.

Based on light curve observations in 2009, 2010 EL 139 rotates once around its axis in 6 hours and 19.2 minutes. It follows that in a 2010 EL 139 year it performs 345 319.8 self- rotations (“days”). However, this is still fraught with uncertainties, as the observation time at that time was insufficient and the error rate is around 30%.

Provisions of the diameter for 2010 EL 139
year Dimensions km source
2018 336.0 Johnston
2018 447.0 Brown
The most precise determination is marked in bold .

See also

Web links

Individual evidence

  1. ^ A b Marc W. Buie : Orbit Fit and Astrometric record for 10EL139 . SwRI (Space Science Department). Retrieved March 5, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 5, 2019.
  3. ↑ a b c 2010 EL139 at the IAU Minor Planet Center (English) Accessed March 5, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ S. Benecchi, S. Sheppard : Light Curves of 32 Large Transneptunian Objects (PDF) . In: The Astronomical Journal . 145, No. 5, January 24, 2013, p. 124, 19. arxiv : 1301.5791 . bibcode : 2013AJ .... 145..124B . doi : 10.1088 / 0004-6256 / 145/5/124 .
  6. ↑ MPC : MPEC 2010-G56: 2010 EL139 . IAU . April 9, 2010. Retrieved March 5, 2019.
  7. ↑ 2010 EL139 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 5, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 5, 2019.
  9. ↑ 2010 EL139 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  10. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 5, 2019.