(120132) 2003 FY ₁₂₈

Asteroid (120132) 2003 FY 128
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	49.659  AU
eccentricity	0.252
Perihelion - aphelion	37.153 AU - 62.165 AU
Inclination of the orbit plane	11.8 °
Length of the ascending node	341.8 °
Argument of the periapsis	175.6 °
Time of passage of the perihelion	August 14, 1988
Sidereal period	349 a 11.2 M
Mean orbital velocity	4.192 km / s
Physical Properties
Medium diameter	${\displaystyle 460_{-21}^{+21}\mathrm {km} }$
Albedo	0.079 ± 0.010
Rotation period	8.54 h (0.356 d )
Absolute brightness	5.09 ± 0.09 mag
Spectral class	C B-V = 1.050 ± 0.020 VR = 0.600 ± 0.010 VI = 1.150 ± 0.010 BR = 1.650 ± 0.020
history
Explorer	Chadwick A. Trujillo Michael E. Brown Eleanor F. Helin Steven H. Pravdo Kenneth J. Lawrence Michael Hicks
Date of discovery	March 26, 2003
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.

(120132) 2003 FY ₁₂₈ is a large trans-Neptunian object that is classified as a near or extended scattered disc object (SDO or DO) in terms of orbital dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2003 FY ₁₂₈ was recorded on March 26, 2003 by a team of astronomers consisting of Chad Trujillo , Mike Brown , Eleanor "Glo" Helin , Steven Pravdo, Kenneth Lawrence and Michael Hicks as part of the Near Earth Asteroid Tracking Project (NEAT) discovered with the 1.2 m Oschin Schmidt telescope at the Palomar Observatory ( California ). The discovery was announced on April 25, 2003 together with Ceto , the planetoid was given the minor planet number 120132 by the IAU .

After its discovery, FY ₁₂₈ could be identified back in 2003 on photos up to December 8, 1989, which were also taken at the Palomar Observatory as part of the Digitized Sky Survey program , and so its observation period was extended by 14 years, including his Calculate orbit more accurately. In April 2017, a total of 186 observations over a period of 27 years were available. The last observation so far was carried out in April 2016 on the Pan-STARRS telescope (PS1). (As of March 1, 2019)

properties

Orbit

2003 FY ₁₂₈ orbits the sun in 349.94 years in an elliptical orbit between 37.15  AU and 62.16 AU from its center. The orbital eccentricity is 0.252, the orbit is 11.78 ° inclined to the ecliptic . The planetoid is currently 40.20 AU from the sun. He last passed through perihelion in 1988, so the next perihelion should take place in 2338.

Marc Buie ( DES ) classifies the planetoid as an extended SDO , 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 460 km is currently assumed, based on a reflectivity of 7.9% and an absolute brightness of 5.09  ^m , which was determined using the Herschel space telescope . Assuming a diameter of 460 km, this results in a total surface of around 665,000 km ² . The apparent magnitude of 2003 FY ₁₂₈ is 20.82  ^m .

Since it can be assumed that 2003 FY ₁₂₈ 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 it is in 2003 FY ₁₂₈ to possibly is a dwarf planet.

Based on light curve observations in 2009, 2003 FY ₁₂₈ rotates once around its axis in 8 hours and 32.4 minutes. It follows that in a 2003 FY ₁₂₈ year it performs 359205.5 self- rotations (“days”). However, this is still fraught with uncertainties, as the observation time at that time was insufficient and the error rate is around 30%.

Provisions of diameter for 2003 FY ₁₂₈

year	Dimensions km	source
2012	479.0 + 055.0- 069.0 460.0 ± 21.0	Santos-Sanz et al. a.
2016	505.27	LightCurve DataBase
2018	467.0	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

• Precovery photos from 2003 FY ₁₂₈
• 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 120132 . SwRI (Space Science Department). Retrieved March 1, 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 c} (120132) 2003 FY128 at the IAU Minor Planet Center (English) Accessed March 1, 2019.
4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
5. ↑ ^{a b c d} P. Santos-Sanz u. a .: "TNOs are Cool": A Survey of the Transneptunian Region IV. Size / albedo characterization of 15 scattered disk and detached objects observed with Herschel Space Observatory-PACS (PDF) . In: Astronomy and Astrophysics . 541, No. A92, February 7, 2012, p. 18. arxiv : 1202.1481 . bibcode : 2012A & A ... 541A..92S . doi : 10.1051 / 0004-6361 / 201118541 .
6. ↑ A. Thirouin et al. a .: Short-term variability of a sample of 29 trans-Neptunian objects and Centaurs . In: Astronomy and Astrophysics . 522, No. A93, April 27, 2010, p. 43. arxiv : 1004.4841 . bibcode : 2010A & A ... 522A..93T . doi : 10.1051 / 0004-6361 / 200912340 .
7. ↑ ^{a b} LCDB Data for (120132) 2003 FY128 . MinorPlanetInfo. 2016. Accessed March 1, 2019.
8. ↑ ^{a b c} 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 .
9. ↑ N. Peixinho et al. 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 .
10. ↑ MPC : MPEC 2003-H33: 2003 FX128, 2003 FY128 . IAU . April 25, 2003. Retrieved March 1, 2019.
11. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 1, 2019.
12. ↑ (120132) 2003 FY128 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 1, 2019.
13. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 1, 2019.
14. ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Accessed March 1, 2019.
15. ↑ (120132) 2003 FY128 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
16. ↑ ^{a b} Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 1, 2019.