(82155) 2001 FZ 173

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Asteroid
(82155) 2001 FZ 173
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO ,
"Distant Object"
Major semi-axis 86.745  AU
eccentricity 0.626
Perihelion - aphelion 32.429 AU - 141.061 AU
Inclination of the orbit plane 12.7 °
Length of the ascending node 2.4 °
Argument of the periapsis 199.6 °
Time of passage of the perihelion January 24, 2011
Sidereal period 807 a 11.1 M
Mean orbital velocity 3.172 km / s
Physical Properties
Medium diameter approx. 330 km
Albedo 0.04-0.10
Absolute brightness 5.811 ± 0.027 - 6.5 mag
Spectral class C
B-V = 0.860 ± 0.010
VR = 0.550 ± 0.010
VI = 1.050 ± 0.010
BR = 1.418 ± 0.030
history
Explorer Spacewatch :
MT Read
Arianna E. Gleason
Date of discovery March 24, 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.

(82155) 2001 FZ 173 is a large Trans-Neptunian object that is classified as a Scattered Disk Object (SDO) in terms of rail dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2001 FZ 173 was discovered on March 24, 2001 by MT Read and Arianna E. Gleason as part of the Spacewatch project with the 0.9 m telescope at the Steward Observatory of the Kitt Peak Observatory ( Arizona ). The discovery was announced on 14 April 2001, the asteroid was on 4 May 2004 by the IAU , the Minor Planet -number 82155 .

After its discovery, 2001 FZ 173 could be identified on photos taken as part of the Sloan Digital Sky Survey program (SDSS) at the Apache Point Observatory ( New Mexico ) going back to May 5, 2000, thus changing its observation period extend about a year in order to calculate its orbit more precisely. Since then, the planetoid has been observed through various earth-based telescopes. In April 2017, a total of 46 observations over a period of 16 years were available. The last observation so far was carried out in April 2016 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 23, 2019)

properties

Orbit

2001 FZ 173 orbits the sun in 807.93 years on a strongly elliptical orbit between 32.43  AU and 141.06 AU from its center. The orbit eccentricity is 0.626, the orbit is 12.72 ° inclined to the ecliptic . The planetoid is currently 33.20 AU from the Sun. The last time he went through perihelion was in 2011, so the next perihelion should take place in 2819.

Both Marc Buie ( DES ) and the Minor Planet Center classify the planetoid as SDO ; the latter also generally lists it as a “distant object” .

size

A diameter of 330 km is currently assumed, based on a reflectivity of 4% and an absolute brightness of 6.5  m . Based on this diameter, the total area is about 342,000 km². The apparent brightness of 2001 FZ 173 is 21.47  m .

Since it is conceivable that 2001 FZ 173 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 FZ 173 to perhaps is a dwarf planet.

2001 FZ 173 seems to have a bluish (neutral) color, which is why the albedo is assumed to be comparatively low.

Determination of the diameter for 2001 FZ 173
year Dimensions km source
2015 238.51 LightCurve DataBase
2018 267.0 Johnston
2018 330.0 Brown
The most precise determination is marked in bold .

See also

Web links

Individual evidence

  1. ^ A b Marc W. Buie : Orbit Fit and Astrometric record for 82155 . 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 c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Accessed March 23, 2019.
  4. ↑ a b c (82155) 2001 FZ173 at the IAU Minor Planet Center (English) Retrieved March 23, 2019.
  5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  6. ↑ 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 .
  7. ↑ a b LCDB Data for (82155) . MinorPlanetInfo. 2015. Accessed March 23, 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. ↑ MPC : MPEC 2001-G33: 2001 FZ173 . IAU . April 14, 2001. Retrieved March 23, 2019.
  10. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 23, 2019.
  11. ↑ (82155) 2001 FZ173 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 23, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  12. ↑ (82155) 2001 FZ173 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  13. ↑ a b c Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 23, 2019.