(523624) 2008 CT ₁₉₀

Asteroid (523624) 2008 CT 190
Properties of the orbit ( animation ) Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type	RKBO 3: 7 or SDO , "Distant Object"
Major semi-axis	52.799  AU
eccentricity	0.343
Perihelion - aphelion	34,703 AU - 70,894 AU
Inclination of the orbit plane	38.9 °
Length of the ascending node	103.8 °
Argument of the periapsis	48 °
Time of passage of the perihelion	February 20, 2012
Sidereal period	383 a 7.9 M.
Mean orbital velocity	4.065 km / s
Physical Properties
Medium diameter	approx. 270 km
Albedo	0.08-0.10
Absolute brightness	5.8 likes
Spectral class	C.
history
Explorer	Megan E. Schwamb Michael E. Brown David L. Rabinowitz
Date of discovery	February 9, 2008
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.

(523624) 2008 CT ₁₉₀ is a large trans-Neptunian object in the Kuiper belt , which is classified dynamically as a resonant Kuiper belt object (3: 7 resonance) or as a scattered disk object (SDO). Due to its size, the asteroid may be one of the dwarf planet candidates . 2008 CT ₁₉₀ has a natural companion named S / 2012 (523624) 1 , which is about four fifths the diameter of the asteroid . Since both celestial bodies revolve around the common center of gravity , the system can also be understood as a double asteroid system.

discovery

2008 CT ₁₉₀ was discovered on February 9, 2008 by a team of astronomers consisting of Meg Schwamb, Mike Brown and David Lincoln Rabinowitz , using the 1.2 m Oschin Schmidt telescope at the Palomar Observatory of the California Institute of Technology ( California ) . The discovery was made after confirmation by Henry G. Roe of Lowell Observatory announced on 15 May 2008, the asteroid was on 25 September 2018 the IAU , the Minor Planet -number five hundred twenty-three thousand six hundred and twenty-four .

After its discovery, CT _{190 could be identified} on photos taken as part of the Sloan Digital Sky Survey program (SDSS) at the Apache Point Observatory ( New Mexico ) back to January 14, 2002, thus changing its observation period extend six years to calculate its orbit more accurately. Since then, the planetoid has been observed through various earth-based telescopes. In October 2018, a total of 118 observations were made over a period of 17 years. The last observation so far was carried out in March 2018 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 24, 2019)

properties

Orbit

2008 CT ₁₉₀ orbits the sun in 383.66 years in a strongly elliptical orbit between 34.70  AU and 70.89 AU from its center. The orbit eccentricity is 0.343, the orbit is 38.90 ° inclined to the ecliptic . The planetoid is currently 34.98 AU from the sun. He last passed through perihelion in 2012, so the next perihelion should take place in 2395.

Marc Buie ( DES ) classifies the planetoid as RKBO ( 3: 7 resonance with Neptune ) or as SDO , while the Minor Planet Center only classifies it as SDO; the latter also generally lists it as a “distant object” .

size

A diameter of 270 km is currently assumed, based on a reflectivity of 9% and an absolute brightness of 5.8  ^m . Based on this diameter, the total surface area is around 229,000 km ² .

Since it is conceivable that 2008 CT ₁₉₀ 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 expects that it is at 2,008 CT ₁₉₀ to perhaps is a dwarf planet.

Determinations of the diameter for 2008 CT ₁₉₀

year	Dimensions km	source
2013	290.75	LightCurve DataBase
2018	306.0 270.0	Johnston
2018	329.0	Brown
The most precise determination is marked in bold .

moon

→ Main article : S / 2012 (523624) 1

On April 29, 2018, a team of astronomers led by Keith S. Noll announced the discovery of a companion around 220 km in diameter, which was tracked down in 2012 using images from the Hubble Space Telescope . It circles the common barycenter with 2008 CT ₁₉₀ in 3.3 days at a mean distance of 1300 ± 200 km. So far, no mass determination has been carried out.

The 2008 CT ₁₉₀ system at a glance:

Components	Physical parameters			Path parameters				discovery
Surname	Throughput diameter (km)	Relative size %	Mass (kg)	Major semi-axis (km)	Orbital time (d)	eccentricity	Inclination to the 2008 CT 190 equator	Date of discovery Date of publication
(523624) 2008 CT 190	270.0	100.00	?	-	-	-	-	February 9, 2008 May 15, 2008
S / 2012 (523624) 1 (523624 I)	220.0	81.48	?	1300	3.3	?	?	May 18, 2012 April 29, 2018

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 523624 . SwRI (Space Science Department). Retrieved March 24, 2019.
2. ↑ ^{a b} MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 24, 2019.
3. ↑ ^{a b c} Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Accessed March 24, 2019.
4. ↑ ^{a b c} (523624) 2008 CT190 at the IAU Minor Planet Center (English) Accessed March 24, 2019.
5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
6. ↑ ^{a b} LCDB Data for (523624) . MinorPlanetInfo. 2018. Retrieved March 24, 2019.
7. ↑ MPC : MPEC 2008-J72: 2008 CT190 . IAU . May 15, 2008. Retrieved March 24, 2019.
8. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 24, 2019.
9. ↑ (523624) 2008 CT190 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 24, 2019.
10. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Accessed March 24, 2019.
11. ↑ ^{a b} Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 24, 2019.
12. ^ ^{A b} Wm. R. Johnston: Asteroids with Satellites - (523624) 2008 CT190 . Johnston's Archives. September 30, 2018. Retrieved March 24, 2019.
13. ↑ IAU : CBET 4513: 20180429: 2008 CT190 . Central Bureau for Astronomical Telegrams. April 29, 2018. Retrieved March 24, 2019.