| 词条 | (418993) 2009 MS9 | |||||||||||||||||
| 释义 |
| minorplanet = yes | background = #C2E0FF | name = {{mp|(418993) 2009 MS|9}} | discovery_ref = [1][2] | discoverer = CFHT (568) | discovered = 25 June 2009 | mpc_name = {{mp|(418993) 2009 MS|9}} | mp_category = Centaur (DES)[3] | orbit_ref = [4] | epoch = 13 January 2016 (JD 2457400.5) | observation_arc = 2352 days (6.44 yr) | aphelion = 696 AU (barycentric 2050) 684 AU | perihelion = {{Convert|11.002|AU|Tm|abbr=on}} | semimajor = 353 AU (barycentric 2050) 347.6 AU | eccentricity = 0.96835 | period = 6481.05 yr (2367202 d) | inclination = 68.056° | asc_node = 220.226° | mean_anomaly = 0.16189° | arg_peri = 128.675° | dimensions = 30–60 km[7] | abs_magnitude = 9.9[4] | magnitude = 21[9] | mean_motion = {{Deg2DMS|0.00015208|sup=ms}} / day | uncertainty = 2 }} {{mp|(418993) 2009 MS|9}}, provisionally known as {{mp|2009 MS|9}}, is a centaur roughly 30–60 km in diameter. It has a highly inclined orbit and a barycentric semi-major axis (average distance from the Sun) of ~353 AU.{{#tag:ref|Given the orbital eccentricity of this object, different epochs can generate quite different heliocentric unperturbed two-body best-fit solutions to the semi-major axis and orbital period. For objects at such high eccentricity, the Sun's barycentric coordinates are more stable than heliocentric coordinates. Using JPL Horizons, the barycentric semi-major axis is approximately 353 AU.[10]|name=footnoteA|group=lower-alpha}} {{mp|2009 MS|9}} has a well determined orbit and has been assigned a minor planet number. Objects such {{mp|2009 MS|9}} may be the origin of Halley-type comets.[2]It came to perihelion in February 2013 at a distance of 11 AU from the Sun (outside the orbit of Saturn).[4] {{As of|2016}}, it is 12 AU from the Sun.[9] It will not be 50 AU from the Sun until 2047. After leaving the planetary region of the Solar System, {{mp|2009 MS|9}} will have a barycentric aphelion of 696 AU with an orbital period of 6640 years. In a 10 million year integration of the orbit, the nominal (best-fit) orbit and both 3-sigma clones remain outside 8.3AU (qmin) from the Sun.[3]
Notes1. ^1 {{cite web |title=MPEC 2009-S59 : 2009 MS9 |publisher=IAU Minor Planet Center |date=2009-09-20 |url=http://www.minorplanetcenter.net/iau/mpec/K09/K09S59.html |accessdate=2016-02-11}} (K09M09S) 2. ^1 2 3 {{cite web |type=last observation: 2015-12-03; arc: 6.44 yr |title=JPL Small-Body Database Browser: 418993 (2009 MS9) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009MS9 |publisher=Jet Propulsion Laboratory |accessdate=8 April 2016}} 3. ^1 {{cite web |title=Absolute Magnitude (H) |publisher=NASA/JPL |url=http://neo.jpl.nasa.gov/glossary/h.html |accessdate=2016-02-04}} 4. ^1 2 {{cite web |author=Marc W. Buie |author-link=Marc W. Buie |title=Orbit Fit and Astrometric record for 418993 |publisher=SwRI (Space Science Department) |url=http://www.boulder.swri.edu/~buie/kbo/astrom/418993.html |accessdate=2016-02-11}} 5. ^1 2 {{cite web |title=AstDyS (418993) 2009MS9 Ephemerides |publisher=Department of Mathematics, University of Pisa, Italy |url=http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=2009MS9 |accessdate=2016-02-11}} 6. ^1 2 {{cite journal |last1=Parker |first1=Joel |last2=Jones |first2=Lynne |last3=Petit |first3=Jean-Marc |last4=Rousselot |first4=Philippe |title=Scrutinizing the Extreme TNO 2009 MS9 |journal=National Optical Astronomy Observatory (NOAO) |year=2010 |bibcode=2010noao.prop..285P}} 7. ^1 {{cite web |author=Horizons output |url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2009MS9 |title=Barycentric Osculating Orbital Elements for 2009 MS9 |accessdate=2016-02-11}} (Solution using the Solar System Barycenter and barycentric coordinates. Select Ephemeris Type:Elements and Center:@0) References{{reflist| refs =[1][2][3][4][5][6][7] }} External links
6 : Extended centaurs|Scattered disc and detached objects|Discoveries by Brett J. Gladman|Discoveries by John J. Kavelaars|Discoveries by Jean-Marc Petit|Astronomical objects discovered in 2009 |
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