(524531) 2002 XH 91
Asteroid 2002 XH 91 |
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Properties of the orbit ( animation ) | |
Orbit type |
CKBO ( "Cold" ), "Distant Object" |
Major semi-axis | 43,752 AU |
eccentricity | 0.094 |
Perihelion - aphelion | 39.658 AU - 47.846 AU |
Inclination of the orbit plane | 5 ° |
Length of the ascending node | 80.6 ° |
Argument of the periapsis | 186.5 ° |
Time of passage of the perihelion | September 29, 2134 |
Sidereal period | 289 a 4.8 M |
Mean orbital velocity | 4.466 km / s |
Physical Properties | |
Medium diameter | approx. 298 km |
Dimensions | 6:50 ± 0:40 · 10 18 | kg
Albedo | 0.08-0.10 |
Absolute brightness | 5.7 - 5.8 mag |
Spectral class | C. |
history | |
Explorer | Lawrence H. Wasserman David E. Trilling Robert L. Millis |
Date of discovery | 4th December 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. |
(524531) 2002 XH 91 is a large trans-Neptunian object in the Kuiper Belt , which is classified as Cubewano (CKBO) in terms of railway dynamics . Due to its size, the asteroid is one of the dwarf planet candidates . 2002 XH 91 has a natural companion named S / 2008 (524531) 1 , which is about two-thirds the diameter of the asteroid . Since both celestial bodies revolve around the common center of gravity , the system can also be understood as a double asteroid system.
discovery
2002 XH 91 was on 4 December 2002 by a team of astronomers consisting of Larry Wasserman, David Robert Trilling and Millis, with the 4.0-m-reflector telescope at Kitt Peak National Observatory ( Arizona discovered). The discovery was announced on January 2, 2003 along with the TNO 2002 XD 91 , 2002 XE 91 , 2002 XF 91 , 2002 XG 91, and 2002 XJ 91 . the planetoid was given the provisional designation 2002 XH 91 and on May 18, 2019, the minor planet number 524531 from the IAU .
The observation arc of the asteroid begins with the official observation on December 4, 2002. Since then, the asteroid has been observed through various earth-based telescopes. In December 2018 there were a total of 60 observations over a period of 16 years. The last observation so far was carried out in February 2018 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 24, 2019)
properties
Orbit
2002 XH 91 orbits the sun in 289.40 years on a slightly elliptical orbit between 39.65 AU and 47.85 AU from its center. The eccentricity of the orbit is 0.094, the orbit is inclined at 5.00 ° to the ecliptic . The planetoid is currently 47.17 AU from the Sun. The next time it passes through perihelion in 2134, the last perihelion should have been in 1845.
Marc Buie ( DES ) classifies the planetoid as Cubewano , whereby it belongs to the orbital dynamics "cold" classical KBO , while the Minor Planet Center does not have a specific classification ;; the latter classifies it as a non-SDO and generally as a “distant object” .
size
A diameter of 298 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.8 m . Based on this diameter, the total area is about 279,000 km². The apparent magnitude of 2002 XH 91 is 22.41 m .
Since it is conceivable that 2002 XH 91 is in hydrostatic equilibrium due to its size and could thus be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown believes that it is in 2002 XH 91 to perhaps is a dwarf planet.
year | Dimensions km | source |
---|---|---|
2015 | 304.44 | LightCurve DataBase |
2018 | 352.0 298.0 |
Johnston |
2018 | 329.0 | Brown |
The most precise determination is marked in bold . |
moon
On May 27, 2009, a team of astronomers led by Keith S. Noll announced the discovery of a companion around 185 km in diameter, which was tracked down using images from the Hubble Space Telescope . It circles the common barycenter with 2002 XH 91 in 371.1 days at a mean distance of 22400 ± 400 km. The system mass was determined to be 6.5 · 10 18 .
The 2002 XH 91 system at a glance:
Components | Physical parameters | Path parameters | discovery | |||||
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Surname | Throughput diameter (km) |
Relative size % |
Mass (kg) |
Major semi-axis (km) |
Orbital time (d) |
eccentricity |
Inclination to the 2002 XH 91 equator |
Date of discovery Date of publication |
2002 XH 91 |
298.0 | 100.00 | 6.5 · 10 18 | - | - | - | - | December 4, 2002 January 2, 2003
|
S / 2008 (524531) 1 (2002 XH 91 I) |
185.0 | 62.08 | ? | 24400 | 371.1 | 0.71 | 3.0 | November 8, 2008 May 27, 2009 |
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
- ^ A b Marc W. Buie : Orbit Fit and Astrometric record for 02XH91 . SwRI (Space Science Department). Retrieved March 24, 2019.
- ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Accessed March 24, 2019.
- ↑ a b c (524531) 2002 XH91 at the IAU Minor Planet Center (English) Accessed March 24, 2019.
- ↑ v ≈ π * a / period (1 + sqrt (1-e²))
- ↑ a b LCDB Data for 2002 XH91 . MinorPlanetInfo. 2009. Retrieved March 24, 2019.
- ↑ MPC : MPEC 2003-A05: 2002 XD91, 2002 XE91, 2002 XF91, 2002 XG91, 2002 XH91, 2002 XJ91 . IAU . January 2, 2003. Retrieved March 24, 2019.
- ↑ (524531) 2002 XH91 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 24, 2019.
- ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Accessed March 24, 2019.
- ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 24, 2019.
- ↑ (524531) 2002 XH91 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 24, 2019.
- ↑ IAU : IAUC No. 9046: 2002 XH_91, V1280 Scorpii . In: Central Bureau for Astronomical Telegrams . May 27, 2009. bibcode : 2009IAUC.9046 .... 1N .
- ^ Wm. R. Johnston: Asteroids with Satellites - 2002 XH91 . Johnston's Archives. September 20, 2014. Accessed March 24, 2019.