(120348) 2004 TY ₃₆₄

Asteroid (120348) 2004 TY 364
Properties of the orbit ( animation ) Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type	DO (E SDO ), "Distant Object"
Major semi-axis	38,709  AU
eccentricity	0.064
Perihelion - aphelion	36.232 AU - 41.186 AU
Inclination of the orbit plane	24.8 °
Length of the ascending node	140.4 °
Argument of the periapsis	1.5 °
Time of passage of the perihelion	April 28, 2080
Sidereal period	240 a 10.1 M
Mean orbital velocity	4.748 km / s
Physical Properties
Medium diameter	${\displaystyle 512_{-40}^{+37}\mathrm {km} }$
Albedo	${\displaystyle 0{,}107_{-0,050}^{+0,020}\mathrm {} }$
Rotation period	11.70 h (0.488 d )
Absolute brightness	4.520 ± 0.070 mag
history
Explorer	Michael E. Brown Chadwick A. Trujillo David L. Rabinowitz
Date of discovery	October 3, 2004
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.

(120348) 2004 TY ₃₆₄ is a large trans-Neptunian object that is classified as an extended SDO in terms of railway dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2004 TY ₃₆₄ was discovered on October 3, 2004 by a team of astronomers from the California Institute of Technology in Pasadena consisting of Mike Brown , Chad Trujillo and David Lincoln Rabinowitz with the 1.2 m Oschin Schmidt telescope at the Palomar Observatory . The discovery was announced on August 1, 2005, the planetoid was given the minor planet number 120348 .

After its discovery, TY _{364 could be identified} in photos up to July 16, 1983, taken as part of the Digitized Sky Survey project at the Siding Spring Observatory , in 2004 , thus extending its observation period by 21 years, thus extending its orbit to calculate more precisely. In April 2017, there were a total of 66 observations over a period of 34 years. The last observation so far was made in November 2018 at the Purple Mountain Observatory . (As of February 24, 2019)

properties

Orbit

2004 TY ₃₆₄ orbits the sun in 240.84 years on a slightly elliptical orbit between 36.23  AU and 41.19 AU from its center. The orbital eccentricity is 0.064, the web is 24.84 ° to the ecliptic inclined . The planetoid is currently 38.93 AU from the sun. He will next pass through perihelion in 2080, so the last perihelion should have occurred in 1839.

Marc Buie ( DES ) classifies the planetoid as an extended SDO (ESDO or DO ), while the Minor Planet Center classifies it as a non-SDO and generally as a distant object . The Johnston's Archive lists it as a Other TNO , which means it is definitely not a Cubewano or Resonantes KBO .

Size and rotation

A diameter of about 512 km is currently assumed, based on a reflectivity of 10.7% and an absolute brightness of 4.52  ^m . The apparent magnitude of 2004 TY ₃₆₄ is 20.48  ^m .

Since it can be assumed that 2004 TY ₃₆₄ 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 2004 TY ₃₆₄ is likely a dwarf planet. Gonzalo Tancredi, on the other hand, rejected candidate status in 2010.

2004 TY ₃₆₄ rotates once around its axis in 11 hours and 42 minutes. It follows that in a 2004 TY ₃₆₄ year 180446.4 rotations (“days”).

Provisions of the diameter for 2004 TY ₃₆₄

year	Dimensions km	source
2008	554.0	Tancredi
2010	529.0	Tancredi
2013	512.0 +37.0−40.0	Lellouch u. a.
2013	365.0	Mommert et al. a.
2013	546.42	LightCurve DataBase
2018	536.0	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} Marc W. Buie : Orbit Fit and Astrometric record for 120348 . SwRI (Space Science Department). Retrieved February 24, 2019.
2. ↑ ^{a b c} (120348) 2004 TY364 at the IAU Minor Planet Center (English) Retrieved February 24, 2019.
3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
4. ↑ ^{a b} E. Lellouch u. 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 .
5. ^ S. Sheppard : Light Curves of Dwarf Plutonian Planets and other Large Kuiper Belt Objects: Their Rotations, Phase Functions, and Absolute Magnitudes (PDF) . In: The Astronomical Journal . 134, No. 2, April 12, 2007, pp. 787-798. arxiv : 0704.1636 . bibcode : 2007AJ .... 134..787S . doi : 10.1086 / 519072 .
6. ↑ MPC : MPEC 2005-P11: 2004 TY364 . IAU . August 1, 2005. Retrieved February 24, 2019.
7. ↑ (120348) 2004 TY364 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 24, 2019.
8. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Accessed February 24, 2019.
9. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 24, 2019.
10. ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 24, 2019.
11. ↑ (120348) 2004 TY364 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 February 24, 2019.
13. ↑ ^{a b} Gonzalo Tancredi: Physical and dynamical characteristics of icy “dwarf planets” (plutoids) (PDF) . In: International Astronomical Union (Ed.): Icy Bodies of the Solar System: Proceedings IAU Symposium No. 263, 2009 . 2010. doi : 10.1017 / S1743921310001717 . Retrieved February 24, 2019.
14. ^ Gonzalo Tancredi, Sofía Favre: DPPH List . In: Dwarf Planets and Plutoid Headquarters, from Which are the dwarfs in the solar system? . September. Retrieved February 24, 2019.
15. ↑ M. Mommert et al. a .: Remnant planetesimals and their collisional fragments: Physical characterization from thermal-infrared observations . September 23, 2013. Accessed February 24, 2019.
16. ↑ LCDB Data for 2004 TY364 . MinorPlanetInfo. May 2013. Retrieved February 24, 2019.