2005 CA 79

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Asteroid
2005 CA 79
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type RKBO 1: 2 ,
"Distant Object"
Major semi-axis 47.65  AU
eccentricity 0.221
Perihelion - aphelion 37.13 AU - 58.17 AU
Inclination of the orbit plane 11.7 °
Length of the ascending node 50.3 °
Argument of the periapsis 69.7 °
Time of passage of the perihelion May 12, 2003
Sidereal period 328 a 11.2 M
Mean orbital velocity 4.280 km / s
Physical Properties
Medium diameter approx. 373 km
Albedo 0.08-0.09
Absolute brightness 5.2 - 5.6 mag
history
Explorer Michael E. Brown ,
Chadwick A. Trujillo,
David L. Rabinowitz
Date of discovery February 1, 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.

2005 CA 79 is a large trans-Neptunian object in the Kuiper belt , which is classified as a resonant KBO ( Twotino ) in terms of railway dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2005 CA 79 was discovered on February 1, 2005 by a team of astronomers consisting of Mike Brown ( CalTech ), Chad Trujillo ( Gemini ) and Dave Rabinowitz ( Yale ) as part of the Near Earth Asteroid Tracking Project (NEAT) with the 1.2 m Oschin Schmidt telescope discovered at the Palomar Observatory of the California Institute of Technology (CalTech) in California . The discovery was announced on September 1, 2007 along with 2003 UY 413 , 2003 UZ 413 , 2004 NT 33 , 2005 CB 79 and 2005 UQ 513 .

After its discovery, CA 79 could be identified in 2005 on photos from December 19, 2001, which were also taken as part of the NEAT program at the Palomar Observatory , and thus its observation period was extended by four years in order to calculate its orbit more precisely. Since then, the planetoid has been observed through various earth-based telescopes. In September 2018, a total of 212 observations were made over a period of 17 years. The last observation so far was carried out in March 2018 on the Pan-STARRS telescope (PS1). (As of March 14, 2019)

properties

Orbit

2005 CA 79 orbits the sun in 328.93 years in an elliptical orbit between 37.13  AU and 58.17 AU from its center. The orbital eccentricity is 0.221, the orbit is 11.67 ° inclined to the ecliptic . The planetoid is currently 37.90 AU from the sun. The last time he went through perihelion was in 2003, so the next perihelion should take place in 2332.

The major semi-axis of 2005 CA 79 is located on the outer edge of the Kuiper belt, the so-called Kuiper cliff (English Kuiper cliff ) at 47 AU.

Both Marc Buie ( DES ) and the Minor Planet Center classify the asteroid as Twotino (RKBO 1: 2); the latter also lists it as a non-SDO and generally as a “distant object” .

size

A diameter of 373 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.6  m . Based on this diameter, the total surface area is around 437,000 km 2 .

Since it is conceivable that 2005 CA 79 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 believes that it is in 2005 CA 79 to perhaps is a dwarf planet.

Determinations of the diameter for 2005 CA 79
year Dimensions km source
2018 404.0 Johnston
2018 373.0 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 05CA79 . SwRI (Space Science Department). Retrieved March 14, 2019.
  2. ↑ a b MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Accessed March 14, 2019.
  3. ↑ a b c 2005 CA79 at the IAU Minor Planet Center (English) Retrieved on March 14, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2007-R02: 2003 UY413, 2003 UZ413, 2004 NT33, 2005 CA79, 2005 CB79, 2005 UQ513 . IAU . September 1, 2007. Accessed March 14, 2019.
  6. ↑ 2005 CA79 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 14, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 14, 2019.
  8. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 14, 2019.
  9. ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 14, 2019.