(471137) 2010 ET 65

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Asteroid
(471137) 2010 ET 65
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO ,
"Distant Object"
Major semi-axis 62.51  AU
eccentricity 0.366
Perihelion - aphelion 39.636 AU - 85.383 AU
Inclination of the orbit plane 30.6 °
Length of the ascending node 189.6 °
Argument of the periapsis 354.6 °
Time of passage of the perihelion January 13, 2014
Sidereal period 494 a 2.8 M.
Mean orbital velocity 3.736 km / s
Physical Properties
Medium diameter approx. 447 km
Albedo 0.06-0.10
Rotation period 7.88 ± 0.05 h (0.328 d )
Absolute brightness 4.96 ± 0.11 - 5.5 mag
Spectral class C.
history
Explorer David L. Rabinowitz
Suzanne W. Tourtellotte
Date of discovery March 13, 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.

(471137) 2010 ET 65 is a large Trans-Neptunian object in the Kuiper Belt , which is classified as a Scattered Disk Object (SDO) in terms of rail dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2010 ET 65 was discovered on March 13, 2010 by Dave Rabinowitz and Suzanne Tourtellotte at the La Silla Observatory ( Chile ) of the European Southern Observatory . The discovery was announced on February 28, 2011.

After its discovery, ET 65 could be identified in photos up to February 7, 2002, which were taken as part of the near-earth asteroid tracking program at the Palomar Observatory ( California ), thus extending its observation period by eight years in order to calculate its orbit more precisely. In April 2017, a total of 239 observations over a period of 14 years were available. The last observation so far was carried out in May 2015 on the Pan-STARRS telescope (PS1). (As of March 3, 2019)

properties

Orbit

2010 ET 65 orbits the sun in 494.23 years in a strongly elliptical orbit between 39.64  AU and 85.38 AU from its center. The orbital eccentricity is 0.365, the web is 30.58 ° to the ecliptic inclined . Currently, the planetoid is 39.76 AU from the sun. The last time he passed through perihelion was in 2014, so the next perihelion should take place in 2508.

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 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 about 628,000 km 2 . The apparent brightness of 2010 ET 65 is 21.29  m .

Since it can be assumed that 2010 ET 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 ET 65 to possibly is a dwarf planet.

Based on light curve observations , the 2010 ET 65 rotates once around its axis in 7 hours and 52.8 minutes. This means that in a 2010 ET 65 year it performs 549 799.1 self- rotations ("days"). However, this is still fraught with some uncertainties, since the observation time at that time was not sufficient; therefore the rotation period may also be completely wrong.

Provisions of the diameter for 2010 ET 65
year Dimensions km source
2013 401.35 LightCurve DataBase
2018 423.0 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 471137 . SwRI (Space Science Department). Retrieved March 3, 2019.
  2. ↑ a b MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 3, 2019.
  3. ↑ a b c (471137) 2010 ET65 at the IAU Minor Planet Center (English) Retrieved March 3, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ a b 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. ↑ a b LCDB Data for (471137) 2010ET65 . MinorPlanetInfo. 2013. Retrieved March 3, 2019.
  7. ↑ MPC : MPEC 2011-D48: 2010 ET65 . IAU . February 28, 2011. Retrieved March 3, 2019.
  8. ↑ (471137) 2010 ET65 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 3, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  9. ↑ (471137) 2010 ET65 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 2, 2019.
  11. ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 2, 2019.