(82158) 2001 FP ₁₈₅

Asteroid (82158) 2001 FP 185
Properties of the orbit ( animation ) Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type	SDO or DO (E SDO ), "Distant Object"
Major semi-axis	223,936  AU
eccentricity	0.847
Perihelion - aphelion	34,303 AU - 413.57 AU
Inclination of the orbit plane	30.8 °
Length of the ascending node	179.4 °
Argument of the periapsis	7.2 °
Time of passage of the perihelion	February 11, 2004
Sidereal period	3351 a 1.9 M
Mean orbital velocity	1,974 km / s
Physical Properties
Medium diameter	${\displaystyle 332_{-24}^{+31}\mathrm {km} }$
Albedo	0.046 ± 0.007
Absolute brightness	5.94 ± 0.05 - 6.39 ± 0.07 mag
Spectral class	C B-V = 0.820 ± 0.020 VR = 0.580 ± 0.020 VI = 1.060 ± 0.010 BR = 1.402 ± 0.055
history
Explorer	Marc W. Buie Susan D. Benecchi (core)
Date of discovery	March 26, 2001
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.

(82158) 2001 FP ₁₈₅ is a large trans-Neptunian object that is classified as a near or extended scattered disk object (SDO or DO) in terms of orbital dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2001 FP ₁₈₅ was discovered on March 26, 2001 by Marc Buie (official) and Susan Benecchi (core) with the 4.0 m Mayall reflector telescope at the Kitt Peak Observatory ( Arizona ). The discovery was made on 24 June 2001 together with the TNO 2000 QM ₂₅₁ and 2000 QN ₂₅₁ and the main belt asteroid 2001 FQ ₁₀₅ and 2001 FR ₁₀₅ announced the planetoid received on 4 May 2004 by the IAU , the Minor Planet -number 82158 .

After its discovery, 2001 FP _{185 could be identified} on photos up to March 21, 1999, which were taken as part of the Sloan Digital Sky Survey program (SDSS) at the Apache Point Observatory ( New Mexico ), thus reversing its observation period extend two years to more accurately calculate its orbit. Since then, the planetoid has been observed through the Herschel Space Telescope as well as various Earth-based telescopes. In April 2017, a total of 29 observations were made over a period of 9 years. The last observation so far was carried out in June 2015 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 23, 2019)

properties

Orbit

2001 FP ₁₈₅ orbits the sun in 3351.16 years on a highly elliptical orbit between 34.30  AU and 413.57 AU from its center. The eccentricity of the orbit is 0.847, the orbit is inclined by 30.79 ° to the ecliptic . The planetoid is currently 37.36 AU from the sun. The last time he went through perihelion was in 2004, the next perihelion should therefore take place in 5355.

If a massive planet like the hypothetical planet Nine exists in the trans-Neptunian realm, 2001 FP ₁₈₅ could be co-ordinate with it .

Both Marc Buie ( DES ) and the Minor Planet Center classify the planetoid as SDO ; the latter also generally lists it as a “distant object” . The Johnston's Archive, however, lists it as an extended SDO (ESDO or DO ).

size

A diameter of 332 km is currently assumed, based on a reflectivity of 4.6% and an absolute brightness of 6.39  ^m , which was determined using data from the Herschel space telescope (instrument PACS). Based on this diameter, the total area is about 346,000 km². The apparent magnitude of 2001 FP ₁₈₅ is 22.02  ^m .

Since it is conceivable that 2001 FP ₁₈₅ 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 believes that it is in 2001 FP ₁₈₅ to perhaps is a dwarf planet.

The surface color of 2001 FP ₁₈₅ was measured several times; accordingly the asteroid has a clear BR and IR spectrum , which are middle classes of the very blue BB and very red RR spectra. The rotation period could not yet be determined.

Provisions of the diameter for 2001 FP ₁₈₅

year	Dimensions km	source
2012	332.0 + 031.0- 024.0	Santos-Sanz et al. a.
2015	222.59	LightCurve DataBase
2018	336.0	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 82158 . SwRI (Space Science Department). Retrieved March 23, 2019.
2. ↑ ^{a b} MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 23, 2019.
3. ^ ^{A b} Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Accessed March 23, 2019.
4. ↑ ^{a b c d} (82158) 2001 FP185 at the IAU Minor Planet Center (English) Accessed March 23, 2019.
5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
6. ↑ ^{a b c d} P. Santos-Sanz u. a .: TNOs are Cool: A survey of the trans-Neptunian region. IV. Size / albedo characterization of 15 scattered disk and detached objects observed with Herschel-PACS (PDF) . In: Astronomy and Astrophysics . 541, No. A92, May 4, 2012, p. 18. arxiv : 1202.1481 . bibcode : 2012A & A ... 541A..92S . doi : 10.1051 / 0004-6361 / 201118541 .
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 (82158) . MinorPlanetInfo. 2015. Accessed March 23, 2019.
9. ↑ ^{a b c d} 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. ↑ ^{a b} (82158) 2001 FP185 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 23, 2019.
11. ↑ MPC : MPEC 2001-M36: 2000 QM251, 2000 QN251, 2001 FP185, 2001 FQ105, 2001 FR105 . IAU . June 24, 2001. Retrieved March 23, 2019.
12. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 23, 2019.
13. ^ C. & R. de la Fuente Marcos: Extreme trans-Neptunian objects and the Kozai mechanism: signaling the presence of trans-Plutonian planets . In: Monthly Notices of the Royal Astronomical Society: Letters . 443, No. 1, June 3, 2014, pp. L59-L63. arxiv : 1406.0715 . bibcode : 2013AJ .... 145..124B . doi : 10.1088 / 0004-6256 / 145/5/124 .
14. ↑ (82158) 2001 FP185 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
15. ↑ ^{a b} Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 23, 2019.
16. ↑ D. Jewitt et al. a .: U-Band Photometry of Kuiper Belt Objects (PDF) . In: The Astronomical Journal . 134, No. 5, November 2007, pp. 2046-2053. bibcode : 2007AJ .... 134.2046J . doi : 10.1086 / 522787 .
17. ↑ O. Hainaut et al. a .: Colors of minor bodies in the outer solar system. II. A statistical analysis revisited (PDF) . In: Astronomy and Astrophysics . 546, No. A115, September 10, 2012, p. 20. arxiv : 1209.1896 . bibcode : 2012A & A ... 546A.115H . doi : 10.1051 / 0004-6361 / 201219566 .