(469306) 1999 CD 158

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Asteroid
(469306) 1999 CD 158
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO or
CKBO ( «Hot» ) or
RKBO 4: 7 ,
«Distant Object»
Major semi-axis 43,599  AU
eccentricity 0.147
Perihelion - aphelion 37.176 AU - 50.022 AU
Inclination of the orbit plane 25.5 °
Length of the ascending node 119.1 °
Argument of the periapsis 145 °
Time of passage of the perihelion June 20, 2106
Sidereal period 287 a 10.7 M
Mean orbital velocity 4.474 km / s
Physical Properties
Medium diameter approx. 457 km
Albedo 0.06-0.10
Rotation period 6.88 ± 0.02 h (0.287 d )
Absolute brightness 4.837 ± 0.111 mag
Spectral class C
B-V = 0.860 ± 0.010
VR = 0.520 ± 0.020
VI = 1.100 ± 0.040
BR = 1.384 ± 0.116
history
Explorer Jane X. Luu
David C. Jewitt
Chadwick A. Trujillo
Date of discovery February 10, 1999
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.

(469306) 1999 CD 158 is a large trans-Neptunian object in the Kuiper belt , which is classified dynamically as SDO (SDO), Cubewano or as a resonant Kuiper belt object (4: 7 resonance). Because of its size, the asteroid is a dwarf planet candidate .

discovery

1999 CD 158 was discovered on February 10, 1999 by Jane Luu , Dave Jewitt and Chad Trujillo with the 3.6 m CTIO telescope at the Mauna Kea Observatory ( Hawaii ). The discovery was announced on July 3, 2000, the planetoid was later given the minor planet number 469306 by the IAU .

The asteroid's observation arc begins with the official discovery observation on February 10, 1999. In April 2017, a total of 68 observations were made over a period of 17 years. The last observation so far was made in April 2015 at the Kitt Peak National Observatory . (As of March 1, 2019)

properties

Orbit

1999 CD 158 orbits the sun in 287.89 years on a slightly elliptical orbit between 37.18  AU and 50.02 AU from its center. The orbit eccentricity is 0.147, the orbit is 25.53 ° inclined to the ecliptic . The planetoid is currently 46.48 AU from the Sun. The next time it passes through perihelion in 2106, the last perihelion should have occurred in 1818.

Marc Buie ( DES ) classifies the planetoid as SDO , while the Minor Planet Center classifies it initially as RKBO ( 4: 7 resonance with Neptune ) and now 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 . In addition, he may be a member of the Haumea family, which came from fragments from a previous collision with Haumea .

Size and rotation

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 magnitude of 1999 CD 158 is 21.82  m .

Since it can be assumed that 1999 CD 158 is in hydrostatic equilibrium due to its size and must therefore be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown believes that it is in 1999 CD 158 to possibly is a dwarf planet.

Based on light curve observations that were carried out in March 2015 and resulted in a classic bimodal light curve, CD 158 rotates once around its axis in 1999 in 6 hours and 52.8 minutes. From this it follows that in a 1999 CD 158 year he performs 366803 self- rotations ("days"). The brightness variations were 0.49  m .

Determination of the diameter for 1999 CD 158
year Dimensions km source
2016 420.27 LightCurve DataBase
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 469306 . SwRI (Space Science Department). Retrieved March 1, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Accessed March 1, 2019.
  3. ↑ a b MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Accessed March 1, 2019.
  4. ↑ a b c (469306) 1999 CD158 at the IAU Minor Planet Center (English) Accessed March 1, 2019.
  5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  6. ↑ a b A. Thirouin et al. a .: Rotational Properties of the Haumea Family Members and Candidates: Short-term Variability (PDF) . In: The Astronomical Journal . 151, No. 6, March 14, 2016, p. 148, 20. arxiv : 1603.04406 . bibcode : 2016AJ .... 151..148T . doi : 10.3847 / 0004-6256 / 151/6/148 .
  7. ↑ a b N. Peixinho u. a .: The bimodal colors of Centaurs and small Kuiper belt objects (PDF) . In: Astronomy and Astrophysics . 546, No. A86, June 14, 2012, p. 12. arxiv : 1206.3153 . bibcode : 2012A & A ... 546A..86P . doi : 10.1051 / 0004-6361 / 201219057 .
  8. ↑ a b LCDB Data for (469306) . MinorPlanetInfo. June 2016. Retrieved February 20, 2019.
  9. ↑ a b c I. Belskaya et al. a .: Updated taxonomy of trans-neptunian objects and centaurs: Influence of albedo . In: Icarus . 250, April 2015, pp. 482-491. bibcode : 2015Icar..250..482B . doi : 10.1016 / j.icarus.2014.12.004 .
  10. ↑ MPC : MPEC 2000-N06: 1999 CD158 . IAU . July 3, 2000. Retrieved March 1, 2019.
  11. ↑ (469306) 1999 CD158 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 1, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  12. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 1, 2019.
  13. ↑ (469306) 1999 CD158 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  14. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 1, 2019.