2001 KA 77

from Wikipedia, the free encyclopedia
Asteroid
2001 KA 77
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type CKBO  ( "Hot" )
"Distant Object"
Major semi-axis 47.822  AU
eccentricity 0.092
Perihelion - aphelion 43.413 AU - 52.232 AU
Inclination of the orbit plane 11.9 °
Length of the ascending node 239.1 °
Argument of the periapsis 119.4 °
Time of passage of the perihelion March 3, 2093
Sidereal period 330 a 8.5 M
Mean orbital velocity 4.272 km / s
Physical Properties
Medium diameter
Albedo
Absolute brightness 5.64 ± 0.12 mag
Spectral class C
B-R = 1.820
history
Explorer James L. Elliot
Lawrence H. Wasserman
Date of discovery May 24, 2001
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.

2001 KA 77 is a large trans-Neptunian object in the Kuiper belt , which is classified as Cubewano (CKBO) in terms of railway dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2001 KA 77 was discovered on May 24, 2001 by James Elliot and Larry Wasserman with the 4.0 m Víctor M. Blanco telescope ( DE Cam) at the Cerro Tololo Observatory ( Chile ). The discovery was announced on July 1, 2001 together with the TNO Ixion , 2001 FT 185 , 2001 KW 76 , 2001 KY 76 and 2001 KZ 76 .

The observation arc of the asteroid begins with the official observation on May 24, 2001. Since then, the asteroid has been observed by various telescopes such as the Hubble and Herschel space telescopes as well as earth-based telescopes. In April 2017, there were a total of 33 observations over a period of 5 years. The last observation so far was made in February 2006 with the Hubble Space Telescope. (As of March 13, 2019)

properties

Orbit

2001 KA 77 orbits the sun in 330.71 years on a slightly elliptical orbit between 43.21  AU and 52.23 AU from its center. The orbital eccentricity is 0.092, the orbit is 11.88 ° inclined to the ecliptic . The planetoid is currently 47.50 AU from the Sun. He will next pass through perihelion in 2093, so the last perihelion should have occurred in 1762.

Both Marc Buie ( DES ) and the Minor Planet Center (MPC) classify the asteroids as Cubewano , where he ground dynamically to the "hot" classical KBO heard; the latter also lists it as a non-SDO and generally as a “distant object” .

size

First estimates showed a diameter of about 634 km, which means that in 2001 KA 77 was one of the larger trans-Neptunian objects at the time of its discovery, based on a relatively deep reflectivity of 2.5% and an absolute brightness of 5.61  m . which were determined using the data from the Herschel space telescope combined with the older data, is currently assumed to be 310 km in diameter, based on a higher reflectivity of 9.9% and an absolute brightness of 5.64  m . Based on this diameter, the total area is about 302,000 km². The apparent brightness of 2001 KA 77 is 22.05  m ,

Since it is conceivable that 2001 KA 77 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 believes that it is in 2001 KA 77 to perhaps is a dwarf planet.

Determination of the diameter for 2001 KA 77
year Dimensions km source
2008 634.0 +134.0−92.0 Brucker et al. a.
2012 310.0 +170.0−60.0 Vilenius et al. a.
2018 324.0 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 01KA77 . SwRI (Space Science Department). Retrieved March 27, 2019.
  2. ↑ E. Lellouch et al. a .: “TNOs are Cool”: A survey of the trans-Neptunian region. IX. Thermal properties of Kuiper belt objects and Centaurs from combined Herschel and Spitzer observations (PDF) . In: Astronomy and Astrophysics . 557, No. A60, June 10, 2013, p. 19. bibcode : 2013A & A ... 557A..60L . doi : 10.1051 / 0004-6361 / 201322047 .
  3. ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 27, 2019.
  4. ↑ a b c 2001 KA77 at the IAU Minor Planet Center (English) Retrieved on March 27, 2019.
  5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  6. ↑ a b c d E. Vilenius u. a .: “TNOs are Cool”: A survey of the trans-Neptunian region VI. Herschel / PACS observations and thermal modeling of 19 classical Kuiper belt objects (PDF) . In: Astronomy and Astrophysics . 541, No. A94, April 4, 2012, p. 17. arxiv : 1204.0697 . bibcode : 2012A & A ... 541A..94V . doi : 10.1051 / 0004-6361 / 201118743 .
  7. ↑ MPC : MPEC 2001-N01: 2001 FT185, 2001 KW76, 2001 KX76, 2001 KY76, 2001 KZ76, 2001 KA77 . IAU . July 1, 2001. Retrieved March 27, 2019.
  8. ↑ 2001 KA77 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 27, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  9. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Accessed March 27, 2019.
  10. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 27, 2019.
  11. ↑ 2001 KA77 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 27, 2019.
  13. ↑ M. Brucker et al. a .: High Albedos of Low Inclination Classical Kuiper Belt Objects (PDF) . In: Icarus . 201, No. 1, December 18, 2008. arxiv : 0812.4290 . bibcode : 2009Icar..201..284B . doi : 10.1016 / j.icarus.2008.12.040 .