(418993) 2009 MS9

Minor planet roughly 30–60 km in diameter yes #C2E0FF (418993) 2009 MS 9 Jean-Marc Petit Brett Gladman JJ Kavelaars Mauna Kea Observatory 25 June 2009 (418993) 2009 MS 9 Centaur (DES) 13 January 2016 (JD 2457400.5) 2352 days (6.44 yr) 696 AU (barycentric 2050)684 AU 11.002 AU Tm on 353 AU (barycentric 2050)347.6 AU 0.96835 6481.05 yr (2367202 d) 68.056° 220.226° 0.16189° 128.675° 30–60 km 9.9 21 0.00015208 ms / day 2 (418993) 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.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. footnoteA lower-alpha 2009 MS 9 has a well determined orbit and has been assigned a minor planet number. Objects such 2009 MS 9 may be the origin of Halley-type comets. It came to perihelion in February 2013 at a distance of 11 AU from the Sun (outside the orbit of Saturn). 2016, it is 12 AU from the Sun. It will not be 50 AU from the Sun until 2047. After leaving the planetary region of the Solar System, 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. Orbital evolution Epoch BarycentricAphelion (Q)(AU) Orbitalperiodyr 1950 694 6610 2050 696 6640 Notes lower-alpha References MPEC 2009-S59 : 2009 MS9 IAU Minor Planet Center 2009-09-20 https://www.minorplanetcenter.net/iau/mpec/K09/K09S59.html 2016-02-11 (K09M09S) last observation: 2015-12-03; arc: 6.44 yr JPL Small-Body Database Browser: 418993 (2009 MS9) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009MS9 Jet Propulsion Laboratory 8 April 2016 Absolute Magnitude (H) NASA/JPL http://neo.jpl.nasa.gov/glossary/h.html https://web.archive.org/web/20010302182040/http://neo.jpl.nasa.gov/glossary/h.html dead 2001-03-02 2016-02-04 (418993) = 2009 MS9 https://www.minorplanetcenter.net/db_search/show_object?object_id=418993 Minor Planet Center 2026-06-19 Marc W. Buie Marc W. Buie Orbit Fit and Astrometric record for 418993 SwRI (Space Science Department) http://www.boulder.swri.edu/~buie/kbo/astrom/418993.html 2016-02-11 AstDyS (418993) 2009MS9 Ephemerides Department of Mathematics, University of Pisa, Italy https://newton.spacedys.com/astdys/index.php?pc=1.1.3.0&n=2009MS9 2016-02-11 Parker Joel Jones Lynne Petit Jean-Marc Rousselot Philippe Scrutinizing the Extreme TNO 2009 MS9 National Optical Astronomy Observatory 2010 285 2010noao.prop..285P Horizons output http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2009MS9 Barycentric Osculating Orbital Elements for 2009 MS9 2016-02-11 (Solution using the Solar System Barycenter and barycentric coordinates. Select Ephemeris Type:Elements and Center:@0) External links Distant Minor Planets 248835 & 2009 MS9 – Remanzacco Observatory (15 August 2012) 418993 418993 (418993) 2009 MS 9 418993 Category:Discoveries by Brett J. Gladman Category:Discoveries by John J. Kavelaars Category:Discoveries by Jean-Marc Petit 20090625 Category:Inner Oort cloud