(471954) 2013 RM 98

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Asteroid
(471954) 2013 RM 98
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type DO (E SDO ) or
CKBO ( «Hot» ),
«Distant Object»
Major semi-axis 43,385  AU
eccentricity 0.134
Perihelion - aphelion 37.589 AU - 49.181 AU
Inclination of the orbit plane 28.1 °
Length of the ascending node 352.4 °
Argument of the periapsis 253.4 °
Time of passage of the perihelion July 22, 1939
Sidereal period 285 a 9.2 M
Mean orbital velocity 4.485 km / s
Physical Properties
Medium diameter approx. 343 km
Albedo 0.08-0.09
Absolute brightness 5.4 - 5.7 mag
history
Explorer Niall MacCrann
Andrés A. Plazas
Eusebio Sanchez
David James
Date of discovery September 8, 2013
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.

(471954) 2013 RM 98 is a large trans-Neptunian object in the Kuiper Belt , which is classified as an extended Scattered Disk Object (DO) or as a Cubewano (CKBO) in terms of orbit dynamics. Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2013 RM 98 was discovered on September 8, 2013 by a team of astronomers consisting of Niall MacCrann, Andrés Plazas, Eusebio Sanchez and David James, as part of the Dark Energy Survey project using the 4.0 m Víctor M. Blanco telescope ( DECam) at Cerro Tololo Observatory ( Chile ). The discovery was confirmed by the Kitt Peak Observatory and announced on December 4, 2015, the planetoid was later given the minor planet number 471954 by the IAU .

After its discovery, RM 98 could be identified in photos up to September 26, 2009, taken as part of the Sloan Digital Sky Survey program (SDSS) at the Apache Point Observatory ( New Mexico ), thus changing its observation period Extend four years to more accurately calculate its orbit. Since then, the planetoid has been observed through various earth-based telescopes. In April 2017, a total of 131 observations were made over a period of 7 years. The last observation so far was made in December 2018 at the Mauna Kea Observatory ( Hawaii ). (As of March 19, 2019)

properties

Orbit

2013 RM 98 orbits the sun in 285.77 years in an almost circular orbit between 37.59  AU and 49.18 AU from its center. The orbit eccentricity is 0.134, the orbit is 28.08 ° inclined to the ecliptic . Currently, the planetoid is 45.14 AU from the sun. He passed perihelion for the last time in 1939, so the next perihelion is likely to take place in 2225.

Marc Buie ( DES ) classifies the planetoid as an extended SDO (ESDO or DO ), 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” . The Johnston's Archive, however, lists him as Cubewano , whereby he would belong to the "hot" classic KBO in terms of rail dynamics .

size

A diameter of 343 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 370,000 km 2 . The apparent magnitude of 2013 RM 98 is 22.31  m .

Since it is conceivable that 2013 RM 98 is in hydrostatic equilibrium due to its size and could thus be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2013 RM 98 to perhaps is a dwarf planet.

Provisions of the diameter for 2013 RM 98
year Dimensions km source
2018 368.0 Johnston
2018 343.0 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 471954 . SwRI (Space Science Department). Retrieved March 19, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 19, 2019.
  3. ↑ a b c (471954) 2013 RM98 at the IAU Minor Planet Center (English) Retrieved on March 19, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2015-X29: 2013 RM98 . IAU . December 4, 2015. Accessed March 19, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 19, 2019.
  7. ↑ (471954) 2013 RM98 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 19, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 19, 2019.
  9. ↑ (471954) 2013 RM98 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 19, 2019.