2006 QH 181
|
Asteroid 2006 QH 181 |
|
|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type |
RKBO 3:10 or SDO / Centaur , "Distant Object" |
| Major semi-axis | 66,965 AU |
| eccentricity | 0.442 |
| Perihelion - aphelion | 37.4 AU - 96.53 AU |
| Inclination of the orbit plane | 19.2 ° |
| Length of the ascending node | 73.8 ° |
| Argument of the periapsis | 210.6 ° |
| Time of passage of the perihelion | October 20, 1859 |
| Sidereal period | 548 a 0 M |
| Physical Properties | |
| Medium diameter | approx. 536 km |
| Albedo | 0.08-0.09 |
| Absolute brightness | 4.3 - 4.7 mag |
| history | |
| Explorer | Cerro Tololo Observatory |
| Date of discovery | August 21, 2006 |
| 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. | |
2006 QH 181 is a large trans-Neptunian object , which is classified as a resonant KBO ( 3:10 resonance) or also a scattered disk object / centaur and more generally as a "distant object" . Because of its size, the asteroid is a dwarf planet candidate .
discovery
2006 QH 181 was discovered on August 21, 2006 by a team of astronomers at the Cerro Tololo Observatory ( Chile ). The discovery was announced on November 27, 2006.
The asteroid's observation sheet begins with the official discovery observation in August 2006. In April 2017, there were only 15 observations of three oppositions over a period of 8 years. The last observation so far was made in November 2013 at the Lowell Observatory .
properties
Orbit
2006 QH 181 orbits the sun in 548.00 years on a strongly elliptical orbit between 37.40 AU and 96.53 AU from its center. The orbit eccentricity is 0.441, the orbit is 19.22 ° inclined to the ecliptic . The planetoid is currently 84.04 AU from the Sun and 83.64 AU from Earth . He passed perihelion for the last time in 1859, so the next perihelion is likely to take place in 2407. (As of February 4, 2019)
Due to the insufficient number of observations, the orbit elements and the classification of 2006 QH 181 are currently still uncertain. Marc Buie ( DES ) classifies the planetoid as RKBO ( 3:10 resonance with Neptune ); the Minor Planet Center , on the other hand, lists him as an SDO / Centaur or generally as a “Distant Object” .
size
At present, a diameter of around 536 km is assumed, based on a reflectivity of 8% and an absolute brightness of 4.7 m ; however, this is fraught with some uncertainties, as the estimates range from 460 to 1030 km due to the still unknown albedo. The apparent magnitude of 2006 QH 181 is 23.65 m .
Since it can be assumed that 2006 QH 181 is in hydrostatic equilibrium due to its size and therefore must be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown assumes that 2006 QH 181 is likely a dwarf planet.
| year | Dimensions km | source |
|---|---|---|
| 2010 | 730.0 | Tancredi |
| 2018 | 612.0 | Johnston |
| 2018 | 536.0 | 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
- ^ A b Marc W. Buie : Orbit Fit and Astrometric record for 06QH181 . SwRI (Space Science Department). Retrieved February 4, 2019.
- ↑ a b MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 4, 2019.
- ↑ a b c 2006 QH181 at the IAU Minor Planet Center (English)
- ↑ MPC : MPEC 2006-W101: 2006 QY180, 2006 QA181, 2006 QB181, 2006 QC181, 2006 QG181, 2006 QH181 . IAU . November 27, 2006. Retrieved February 4, 2019.
- ↑ 2006 QH181 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 4, 2019.
- ↑ 2006 QH181 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 February 4, 2019.
- ^ G. Tancredi: Physical and dynamical characteristics of icy “dwarf planets” (plutoids) (PDF) . IAU. April 1, 2010. Accessed February 2, 2019.
- ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 4, 2019.