(145451) 2005 RM 43

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Asteroid
(145451) 2005 RM 43
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO or
"Distant Object"
Major semi-axis 89.61  AU
eccentricity 0.609
Perihelion - aphelion 35.079 AU - 144.14 AU
Inclination of the orbit plane 28.8 °
Length of the ascending node 84.6 °
Argument of the periapsis 318.1 °
Time of passage of the perihelion September 23, 2004
Sidereal period 848 a 3.4 M
Physical Properties
Medium diameter approx. 524 km
Albedo 0.09?
Rotation period 6.71 h (0.280 d )
Absolute brightness 4.4 likes
history
Explorer Andrew Becker
Andrew W. Puckett
Jeremy M. Kubica
Date of discovery September 9, 2005
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.

(145451) 2005 RM 43 is a large trans-Neptunian object , which is classified as a scattered disc object in terms of orbital dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2005 RM 43 was discovered on September 9, 2005 by a team of astronomers consisting of Andrew C. Becker , Andrew W. Puckett and Jeremy M. Kubica at the Apache Point Observatory in Sunspot, New Mexico . The discovery was announced on July 23, 2006. The IAU gave the planetoid the minor planet number 145451 .

After its discovery, RM 43 could be identified in photos from November 17, 1976 in 2005 and its orbit calculated more precisely. Since then, the planetoid has been observed through various earth-based telescopes. In December 2017, a total of 303 observations over a period of 42 years were available.

properties

Orbit

2005 RM 43 orbits the sun in 848.28 years in a strongly elliptical orbit between 35.08  AU and 144.14 AU from its center. The orbit eccentricity is 0.609, the orbit is 28.82 ° inclined to the ecliptic . The last time he went through perihelion was in 2004, the next perihelion should not take place until around the year 2853. The planetoid is currently 37 AU from the sun or 36.48 from the earth (as of February 1, 2019).

Marc Buie ( DES ) classifies it as an SDO . The MPC initially classified 2007 XV 50 as an SDO, while it is now listed as a distant object .

size

A diameter of around 500 to 600 km is currently assumed, based on a reflectivity of 9 to 10% and an absolute brightness of 4.4  m ; however, this is subject to some uncertainties, as the general diameter estimates are between 350 and 800 km. The apparent magnitude of 2005 RM 43 is 20.39  m .

Since it can be assumed that 2005 RM 43 is in hydrostatic equilibrium due to its size and therefore has to be largely round, it should nevertheless meet the criteria for classification as a dwarf planet . Mike Brown assumes that 2005 RM 43 is probably a dwarf planet; according to Gonzalo Tancredi, however, it is only possibly so .

2005 RM 43 rotates once around its axis in 6 hours and 42.6 minutes. From this it follows that the asteroid performs 1,208,100.5 self- rotations (“days”) in a 2005 RM 43 year .

Provisions of the diameter for 2005 RM 43
year Dimensions km source
2010 554.0 Tancredi
2018 584.0 Johnston
2018 524.0 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 145451 . SwRI (Space Science Department). Retrieved February 1, 2019.
  2. ↑ a b c (145451) 2005 RM43 at the IAU Minor Planet Center (English)
  3. ^ D. Perna: Rotations and densities of trans-Neptunian objects (December 2009)
  4. ↑ MPC : MPEC 2006-O24: 2005 RM43 . IAU . July 23, 2006. Retrieved February 1, 2019.
  5. ↑ a b (145451) 2005 RM43 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 1, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  6. ↑ Brian G. Marsden: MPEC 2009-P26: Distant Minor Planets (2009 Aug. 17.0 TT.) . In: IAU Minor Planet Center . August 7, 2009. Retrieved February 1, 2019.
  7. ↑ (145451) 2005 RM43 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  8. ↑ a b M. Brown : How many dwarf planets are there in the outer solar system? . CalTech. November 12, 2018. Retrieved February 1, 2019.
  9. ^ A b G. Tancredi: Physical and dynamical characteristics of icy “dwarf planets” (plutoids) . IAU. April 1, 2010. Accessed February 1, 2019.
  10. ↑ Johnston's Archives: List of Known Trans-Neptunian Objects (October 2018)