(471288) 2011 GM 27
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Asteroid (471288) 2011 GM 27 |
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|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | DO (E SDO ), or CKBO ( «Hot» ), «Distant Object» |
| Major semi-axis | 43.779 AU |
| eccentricity | 0.026 |
| Perihelion - aphelion | 42.661 AU - 44.897 AU |
| Inclination of the orbit plane | 13 ° |
| Length of the ascending node | 257.3 ° |
| Argument of the periapsis | 208.8 ° |
| Time of passage of the perihelion | October 7, 1953 |
| Sidereal period | 289 a 8.0 M |
| Mean orbital velocity | 4,465 km / s |
| Physical Properties | |
| Medium diameter | approx. 447 km |
| Albedo | 0.06-0.09 |
| Absolute brightness | 5.1 - 5.5 mag |
| history | |
| Explorer | La Silla Observatory |
| Date of discovery | April 2, 2011 |
| 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. | |
(471288) 2011 GM 27 is a large trans-Neptunian object in the Kuiper belt , which is classified as an extended Scattered Disk Object (DO) or as a Cubewano (CKBO) in terms of orbit dynamics. Because of its size, the asteroid is a dwarf planet candidate .
discovery
2011 GM 27 was discovered on April 2, 2011 by a team of astronomers at the La Silla Observatory ( Chile ) of the European Southern Observatory (ESO). The asteroid was later given the minor planet number 471288 by the IAU .
After its discovery, GM 27 could be identified in 2011 on photos up to January 7, 2006, which were taken as part of the Sloan Digital Sky Survey program (SDSS) at the Siding Spring Observatory ( Australia ), and so was his Extend the observation period by 18 years in order to calculate its orbit more precisely. In April 2017, a total of 179 observations over a period of 24 years were available. The last observation so far was carried out in May 2015 Pan-STARRS telescope (PS1). (As of March 3, 2019)
properties
Orbit
2011 GM 27 orbits the sun in 289.671 years in an almost circular orbit between 42.66 AU and 44.90 AU from its center. The orbit eccentricity is 0.026, the orbit is inclined 13.02 ° to the ecliptic . The planetoid is currently 43.64 AU from the sun. He last passed through perihelion in 1953, so the next perihelion should take place in 2243.
Marc Buie ( DES ) classifies the planetoid as an extended SDO (ESDO or DO ), 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” . The Johnston's Archive, however, lists him as Cubewano , whereby he would belong to the "hot" classic KBO in terms of rail dynamics .
size
A diameter of 447 km is currently assumed, based on a reflectivity of 6% and an absolute brightness of 5.5 m . Assuming a diameter of 447 km, this results in a total surface of about 628,000 km 2 . The apparent magnitude of 2011 GM 27 is 21.74 m .
Since it can be assumed that 2011 GM 27 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 expects that it is at 2011 GM 27 to possibly is a dwarf planet.
| year | Dimensions km | source |
|---|---|---|
| 2018 | 423.0 | Johnston |
| 2018 | 447.0 | 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 photo of 2011 GM 27
- 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 471288 . SwRI (Space Science Department). Retrieved March 4, 2019.
- ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 4, 2019.
- ↑ a b c (471288) 2011 GM27 at the IAU Minor Planet Center (English) Retrieved on March 4, 2019.
- ↑ v ≈ π * a / period (1 + sqrt (1-e²))
- ↑ (471288) 2011 GM27 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 4, 2019.
- ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 3, 2019.
- ↑ (471288) 2011 GM27 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 4, 2019.