(79978) 1999 CC ₁₅₈

Asteroid (79978) 1999 CC 158
Properties of the orbit ( animation ) Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type	RKBO 5:12 SDO , "Distant Object"
Major semi-axis	53.72  AU
eccentricity	0.272
Perihelion - aphelion	39,095 AU - 68,344 AU
Inclination of the orbit plane	18.8 °
Length of the ascending node	337 °
Argument of the periapsis	101.3 °
Time of passage of the perihelion	May 18, 1968
Sidereal period	393 a 8.9 M.
Mean orbital velocity	4.030 km / s
Physical Properties
Medium diameter	approx. 302 km
Albedo	0.08-0.09
Absolute brightness	5.7 - 5.9 mag
history
Explorer	David C. Jewitt Chadwick A. Trujillo Jane X. Luu Scott S. Sheppard
Date of discovery	February 15, 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.

(79978) 1999 CC ₁₅₈ is a large trans-Neptunian object that is classified as a resonant Kuiper belt object (5:12 resonance) or as a scattered disk object (SDO). Due to its size, the asteroid is one of the dwarf planet candidates .

discovery

1999 CC ₁₅₈ was discovered on February 15, 1999 by a team of astronomers consisting of Dave Jewitt , Chad Trujillo , Jane Luu and Scott Sheppard using the 3.6 m CFHT telescope at the Mauna Kea Observatory ( Hawaii ). The discovery was announced on July 3, 2000, the planetoid was later given the minor planet number 79978 by the IAU .

The observation arc of the planetoid begins with the official observation on February 15, 1999. Since then, the planetoid has been observed through various earth-based telescopes. In April 2017, there were a total of 31 observations over a period of 17 years. The last observation so far was made in April 2015 at the Kitt Peak Observatory ( Arizona ). (As of March 29, 2019)

properties

Orbit

1999 CC ₁₅₈ orbits the sun in 393.74 years on a strongly elliptical orbit between 39.09  AU and 68.34 AU from its center. The orbit eccentricity is 0.272, the orbit is 18.77 ° inclined to the ecliptic . The planetoid is currently 39.09 AU from the Sun. He last passed through perihelion in 1968, so the next perihelion should take place in 2362.

Marc Buie ( DES ) classifies the planetoid as RKBO ( 5:12 resonance with Neptune ), while the Minor Planet Center classifies it as SDO ; the latter classifies it generally as a "distant object" .

size

A diameter of 302 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 6.0  ^m . Based on this diameter, the total area is about 287,000 km². The apparent magnitude of 1999 CC ₁₅₈ is 22.45  ^m .

Since it is conceivable that 1999 CC ₁₅₈ 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 expects that it is at 1999 CC ₁₅₈ to perhaps is a dwarf planet.

Determination of the diameter for 1999 CC ₁₅₈

year	Dimensions km	source
2018	321.0	Johnston
2018	302.0	Brown
The most precise determination is marked in bold .

See also

• List of trans-Neptunian objects
• List of dwarf planets of the solar system
• List of asteroids
• List of moons from asteroids

Web links

• How many dwarf planets are there in the outer solar system? Current list of the largest TNOs from Mike Brown
• Free the dwarf planets! Mike Brown's column on the IAU and the dwarf planets regarding their classifications (23 August 2011)

Individual evidence

1. ^ ^{A b c} Marc W. Buie : Orbit Fit and Astrometric record for 79978 . SwRI (Space Science Department). Retrieved March 29, 2019.
2. ↑ ^{a b c} Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 29, 2019.
3. ↑ ^{a b} MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 29, 2019.
4. ↑ ^{a b c} (79978) 1999 CC158 at IAU Minor Planet Center (English) Retrieved March 29, 2019.
5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
6. ↑ MPC : MPEC 2000-N05: 1999 CC158 . IAU . July 3, 2000. Retrieved March 29, 2019.
7. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 29, 2019.
8. ↑ (79978) 1999 CC158 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 29, 2019.
9. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Retrieved March 29, 2019.
10. ↑ (79978) 1999 CC158 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
11. ↑ ^{a b} Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 29, 2019.