2010 ER 65

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Asteroid
2010 ER 65
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO ,
"Distant Object"
Major semi-axis 98.988  AU
eccentricity 0.595
Perihelion - aphelion 40.043 AU - 157.932 AU
Inclination of the orbit plane 21.2 °
Length of the ascending node 212.7 °
Argument of the periapsis 324.3 °
Time of passage of the perihelion September 25, 2006
Sidereal period 984 a 10.4 M
Mean orbital velocity 3.853 km / s
Physical Properties
Medium diameter approx. 457 km
Albedo 0.06-0.09
Absolute brightness 5.2 - 5.4 mag
history
Explorer David L. Rabinowitz
Suzanne W. Tourtellotte
Date of discovery March 10, 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 ER 65 is a large trans-Neptunian object in the Kuiper Belt , which is classified as a Scattered Disk Object (SDO) for orbit dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2010 ER 65 was discovered on March 10, 2010 by Dave Rabinowitz and Suzanne Tourtellotte at the La Silla Observatory ( Chile ) of the European Southern Observatory . The discovery was announced on April 12, 2010 along with 2010 ES 65 , 2010 FB 49 , 2010 FC 49 , 2010 FD 49, and 2010 FE 49 .

The observation sheet of the asteroid begins with the official discovery observation on March 10, 2010. In September 2018, a total of 256 observations over a period of 9 years were available. The last observation so far was carried out in April 2018 on the Pan-STARRS telescope (PS1). (As of March 2, 2019)

properties

Orbit

2010 ER 65 orbits the sun in 984.87 years in a strongly elliptical orbit between 40.04  AU and 157.93 AU from its center. The orbit eccentricity is 0.595, the orbit is inclined 21.22 ° to the ecliptic . The planetoid is currently 41.15 AU from the Sun. The last time he went through perihelion was in 2006, the next perihelion should therefore take place in 2991.

Both Marc Buie ( DES ) and the Minor Planet Center classify the planetoid as SDO ; the latter also lists it generally as a "distant object" .

size

A diameter of 457 km is currently assumed, based on a reflectivity of 6% and an absolute brightness of 5.4  m . Assuming a diameter of 457 km, this results in a total surface of around 656,000 km². The apparent magnitude of 2010 ER 65 is 21.49  m .

Since it can be assumed that 2010 ER 65 is in hydrostatic equilibrium due to its size and must therefore be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2010 ER 65 to possibly is a dwarf planet.

Provisions of the diameter for 2010 ER 65
year Dimensions km source
2018 404.0 Johnston
2018 457.0 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 10ER65 . SwRI (Space Science Department). Retrieved March 2, 2019.
  2. ↑ a b MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 2, 2019.
  3. ↑ a b c 2010 ER65 at the IAU Minor Planet Center (English). Accessed March 2, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2010-G97: 2010 ER65, 2010 ES65, 2010 FB49, 2010 FC49, 2010 FD49, 2010 FE49 . IAU . April 12, 2010. Retrieved March 2, 2019.
  6. ↑ 2010 ER65 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 2, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ↑ 2010 ER65 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  8. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 2, 2019.
  9. ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 2, 2019.