(182934) 2002 FY ₃₂

Asteroid (182934) 2002 FY 32
Properties of the orbit ( animation ) Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type	CKBO  ( «Hot» )  or DO (E SDO ), «Distant Object»
Major semi-axis	44,546  AU
eccentricity	0.108
Perihelion - aphelion	39.757 AU - 49.335 AU
Inclination of the orbit plane	11.6 °
Length of the ascending node	244.9 °
Argument of the periapsis	257.5 °
Time of passage of the perihelion	April 6, 1950
Sidereal period	297 a 3.8 M
Mean orbital velocity	4,426 km / s
Physical Properties
Medium diameter	${\displaystyle 416_{-78}^{+81}\,\mathrm {km} }$
Albedo	${\displaystyle 0{,}035_{-0,011}^{+0,019}\mathrm {} }$
Absolute brightness	6.12 ± 0.13 mag
history
Explorer	Marc W. Buie
Date of discovery	April 8, 2002
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.

(182934) 2002 GJ ₃₂ is a large trans-Neptunian object in the Kuiper belt , which is classified as a Cubewano (CKBO) or an extended Scattered Disk Object (DO) in terms of orbital dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2002 GJ ₃₂ was discovered on April 8, 2002 by Marc Buie with the 4.0 m Víctor M. Blanco telescope (DECam) at the Cerro Tololo Observatory ( Chile ). The discovery was announced on June 2, 2003, the planetoid was later given the minor planet number 182934 by the IAU .

The asteroid's observation sheet begins with the official discovery observation on April 8, 2002. In April 2017, there were a total of 46 observations over a period of 9 years. The last observation so far was made in March 2011 at the Las Campanas Observatory . (As of March 7, 2019)

properties

Orbit

2002 GJ ₃₂ orbits the sun in 297.32 years on a slightly elliptical orbit between 39.76  AU and 49.33 AU from its center. The orbital eccentricity is 0.108, the orbit is 11.57 ° inclined to the ecliptic . The planetoid is currently 44.52 AU from the sun. The last time he passed through perihelion in 1950, the next perihelion should therefore take place in 2247.

Marc Buie ( DES ) classifies the planetoid as an extended SDO (ESDO or DO ), while the Minor Planet Center him as Cubewano classifies, 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

A diameter of 416 km is currently assumed, based on a reflectivity of 3.5% and an absolute brightness of 6.12  ^m . Assuming a diameter of 416 km, this results in a total surface of around 544,000 km². The apparent brightness of 2002 GJ ₃₂ is 22.18  ^m .

Since it can be assumed that 2002 GJ ₃₂ could be in hydrostatic equilibrium due to its size and would therefore have to be largely round, it could meet the criteria for classification as a dwarf planet . Mike Brown , who estimates the diameter itself to be only 235 km ( albedo 12%, absolute brightness 6.1  ^m ), assumes that 2002 GJ ₃₂ may be a dwarf planet.

Provisions of the diameter for 2002 GJ ₃₂

year	Dimensions km	source
2009	224.0 + 088.0- 070.0	Brucker et al. a.
2014	416.0 +81.0−78.0	Vilenius et al. a.
2018	235.0	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} MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Retrieved March 7, 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 7, 2019.
4. ^ ^{A b} Marc W. Buie : Orbit Fit and Astrometric record for 182934 . SwRI (Space Science Department). Retrieved March 7, 2019.
5. ↑ ^{a b c} (182934) 2002 GJ32 at the IAU Minor Planet Center (English) Accessed March 7, 2019.
6. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
7. ↑ ^{a b c d} E. Vilenius u. a .: “TNOs are cool”: A survey of the trans-Neptunian region X. Analysis of classical Kuiper belt objects from Herschel and Spitzer observations (PDF) . In: Astronomy and Astrophysics . 564, No. A35, March 25, 2014, p. 18. arxiv : 1403.6309 . doi : 10.1051 / 0004-6361 / 201322416 .
8. ^ MPC : List Of Transneptunian Objects . IAU . Retrieved March 7, 2019.
9. ↑ MPC : MPEC 2003-L04: 2002 GJ32 . IAU . June 2, 2003. Retrieved March 7, 2019.
10. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 7, 2019.
11. ↑ (182934) 2002 GJ32 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 7, 2019.
12. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 7, 2019.
13. ↑ (182934) 2002 GJ32 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 7, 2019.
15. ↑ M. Brucker et al. a .: High Albedos of Low Inclination Classical Kuiper Belt Objects (PDF) . In: Icarus . January 1, 2009, p. 26. arxiv : 0812.4290 . bibcode : 2012A & A ... 546A..86P . doi : 10.1016 / j.icarus.2008.12.040 .