(312645) 2010 EP 65

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Asteroid
(312645) 2010 EP 65
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type RKBO 1: 2 ,
"Distant Object"
Major semi-axis 47.88  AU
eccentricity 0.309
Perihelion - aphelion 33,065 AU - 62,695 AU
Inclination of the orbit plane 18.9 °
Length of the ascending node 205 °
Argument of the periapsis 352.7 °
Time of passage of the perihelion July 11, 2015
Sidereal period 331 a 3.7 M
Mean orbital velocity 4.269 km / s
Physical Properties
Medium diameter approx. 358 km
Albedo 0.08-0.10
Rotation period 14.97 h (0.624 d ) or
7.48 h (0.312 d )
Absolute brightness 5.23 ± 0.15 - 5.70 mag
Spectral class C.
history
Explorer David L. Rabinowitz
Suzanne W. Tourtellotte
Date of discovery March 9, 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.

(312645) 2010 EP 65 is a large trans-Neptunian object in the Kuiper belt , which is classified as a resonant KBO ( Twotino ) in terms of orbital dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2010 EP 65 was discovered on March 9, 2010 by Dave Rabinowitz and Suzanne Tourtellotte with the 3.6 m ESO telescope at the La Silla Observatory ( Chile ) of the European Southern Observatory (ESO). The discovery was announced on April 30, 2010 together with the centaurs 2010 EO 65 , 2010 EU 65 and 2010 GX 34 , the planetoid was later given the minor planet number 312645 by the IAU .

After its discovery, EP 65 could be identified in photos up to April 14, 1983, taken as part of the Digitized Sky Survey program (DSS) at the Siding Spring Observatory ( Australia ), and thus its observation period by 17 years to calculate its orbit more precisely. Since then, the planetoid has been observed through various earth-based telescopes. In May 2018, a total of 177 observations were made over a period of 35 years. The last observation so far was carried out in May 2018 at the Purple Mountain Observatory ( People's Republic of China ). (As of March 15, 2019)

properties

Orbit

2010 EP 65 orbits the sun in 331.31 years in an elliptical orbit between 33.06  AU and 62.69 AU from its center. The orbit eccentricity is 0.309, the orbit is 18.86 ° inclined to the ecliptic . The planetoid is currently 33.14 AU from the Sun. He last passed through perihelion in 2015, so the next perihelion is likely to take place in 2346.

Marc Buie ( DES ) classifies the planetoid as Twotino (RKBO 1: 2), 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 358 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.7  m . Based on this diameter, the total surface area is around 403,000 km 2 . The apparent magnitude of 2010 EP 65 is 20.71  m .

Since it is conceivable that 2010 EP 65 is in hydrostatic equilibrium due to its size and could therefore be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2010 EP 65 to perhaps is a dwarf planet.

Based on light curve observations , 2010 EP 65 rotates once around its axis in 14 hours and 58.2 minutes. From this it follows that in a 2010 EP 65 year 194006.7 it performs its own rotations (“days”). A second result by the same team of astronomers suggested a rotation period of 7 hours and 28.8 minutes that was half as long, which would practically double the number of 2010 EP 65 days with 388272.7 revolutions. However, both statements are still subject to some uncertainties, as the observation time at that time was insufficient and the error rate is around 30%.

Provisions of the diameter for 2010 EP 65
year Dimensions km source
2015 366.04 LightCurve DataBase
2018 386.0 Johnston
2018 358.0 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 312645 . SwRI (Space Science Department). Retrieved March 15, 2019.
  2. ↑ a b c (312645) 2010 EP65 at the IAU Minor Planet Center (English) Retrieved March 15, 2019.
  3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  4. ↑ a b c 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 .
  5. ↑ a b LCDB Data for (312645) 2010EP65 . MinorPlanetInfo. 2015. Accessed March 4, 2019.
  6. ↑ MPC : MPEC 2010-H80: 2010 EO65, 2010 EP65, 2010 EU65, 2010 GX34 . IAU . April 30, 2010. Retrieved March 15, 2019.
  7. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 15, 2019.
  8. ↑ (312645) 2010 EP65 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 15, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  9. ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 15, 2019.
  10. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 15, 2019.
  11. ↑ (312645) 2010 EP65 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  12. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 15, 2019.