(308379) 2005 RS 43

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Asteroid
(308379) 2005 RS 43
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type RKBO 1: 2  ( Twotino ),
"Distant Object"
Major semi-axis 47.731  AU
eccentricity 0.2
Perihelion - aphelion 38.169 AU - 57.293 AU
Inclination of the orbit plane 10 °
Length of the ascending node 46.4 °
Argument of the periapsis 266.3 °
Time of passage of the perihelion July 18, 1968
Sidereal period 329 a 9.1 M
Mean orbital velocity 4.276 km / s
Physical Properties
Medium diameter approx. 457 km
Albedo 0.06-0.09
Absolute brightness 5.0 - 5.4 mag
history
Explorer Andrew C. Becker
Andrew W. Puckett
Jeremy M. Kubica
Date of discovery September 13, 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.

(308379) 2005 RS 43 is a large trans-Neptunian object that is classified as a resonant KBO ( Twotino ) in terms of orbital dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2005 RS 43 was discovered on September 13, 2005 by a team of astronomers consisting of Andrew Becker, Andrew Puckett and Jeremy Kubica with the 2.5 m Ritchey-Chretien telescope at the Apache Point Observatory ( New Mexico ). The discovery was announced on August 31, 2006 together with 2005 RP 43 , 2005 RQ 43 , 2005 RR 43 , 2005 SC 278 , 2005 SD 278 and 2005 SE 278 , the planetoid was later given the minor planet number 308379 by the IAU .

After its discovery, RS 43 could be identified on photos up to July 17, 1977, which were taken as part of the Digitized Sky Survey program at the Siding Spring Observatory , in 2005 and thus its observation period was extended by 26 years calculate its orbit more precisely. In April 2017, a total of 342 observations over a period of 39 years were available. The last observation so far was carried out in November 2015 on the Pan-STARRS telescope (PS1). (As of March 1, 2019)

properties

Orbit

2005 RS 43 orbits the sun in 329.76 years in an elliptical orbit between 38.17  AU and 57.29 AU from its center. The orbit eccentricity is 0.200, the orbit is 10.03 ° inclined to the ecliptic . The planetoid is currently 43.80 AU from the sun. He last passed through perihelion in 1968, so the next perihelion is likely to take place in 2298.

Marc Buie ( DES ) classifies the planetoid as Twotino ( 1: 2 resonance with Neptune ), while the Minor Planet Center does not have a specific classification. The latter lists it as a non-SDO and 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 brightness of 2005 RS 43 is 21.80  m .

Since it can be assumed that 2005 RS 43 is in hydrostatic equilibrium due to its size and therefore has to be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2005 RS 43 to possibly is a dwarf planet.

Provisions of the diameter for 2005 RS 43
year Dimensions km source
2018 443.0 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 308379 . SwRI (Space Science Department). Retrieved March 1, 2019.
  2. ↑ a b c (308379) 2005 RS43 at the IAU Minor Planet Center (English) Accessed March 1, 2019.
  3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  4. ↑ MPC : MPEC 2006-Q70: 2005 RP43, 2005 RQ43, 2005 RR43, 2005 RS43, 2005 SC278, 2005 SD278, 2005 SE278 . IAU . August 31, 2006. Accessed March 1, 2019.
  5. ↑ (308379) 2005 RS43 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 1, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  6. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Accessed March 1, 2019.
  7. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 1, 2019.
  8. ↑ (308379) 2005 RS43 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  9. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 1, 2019.
  10. ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Accessed March 1, 2019.