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(418993) 2009 MS₉, provisionally known as 2009 MS₉, 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.

2009 MS₉ has a well determined orbit and has been assigned a minor planet number. Objects such 2009 MS₉ 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). As of 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 MS₉ 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 (q_min) from the Sun.

Notes

1. ^ 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.

References

1. "MPEC 2009-S59 : 2009 MS9". IAU Minor Planet Center. 2009-09-20. Retrieved 2016-02-11. (K09M09S)
2. ^ Parker, Joel; Jones, Lynne; Petit, Jean-Marc; Rousselot, Philippe (2010). "Scrutinizing the Extreme TNO 2009 MS9". National Optical Astronomy Observatory (NOAO): 285. Bibcode:2010noao.prop..285P.
3. ^ Marc W. Buie. "Orbit Fit and Astrometric record for 418993". SwRI (Space Science Department). Retrieved 2016-02-11.
4. ^ "JPL Small-Body Database Browser: 418993 (2009 MS9)" (last observation: 2015-12-03; arc: 6.44 yr). Jet Propulsion Laboratory. Retrieved 8 April 2016.
5. "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 2001-03-02. Retrieved 2016-02-04.
6. ^ "AstDyS (418993) 2009MS9 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2016-02-11.
7. Horizons output. "Barycentric Osculating Orbital Elements for 2009 MS9". Retrieved 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) 2009 MS9 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Centaurs (small Solar System bodies)
• Trans-Neptunian objects
• Discoveries by Brett J. Gladman
• Discoveries by John J. Kavelaars
• Discoveries by Jean-Marc Petit
• Astronomical objects discovered in 2009
• Inner Oort cloud