2011 MM4

Centaur August 2021 yes 2011 MM 4 #C7FF8F Pan-STARRS 1 Haleakala Obs. 24 June 2011 2011 MM 4 centaurdamocloiddistant 23 March 2018 (JD 2458200.5) 0 6.99 yr (2,552 d) 31.121 AU 11.138 AU 21.129 AU 0.4729 97.12 yr (35,473 d) 49.176° 0.0101 ms / day 100.48° 282.45° 6.86° −0.4 64 km 0.083 9.5 2011 MM 4 is a sizable centaur and retrograde damocloid from the outer Solar System, approximately 64 km mi off 2 us in diameter. It was discovered on 24 June 2011, by astronomers with the Pan-STARRS 1 at the Haleakala Obs. in Hawaii. History Discovery 2011 MM 4 was discovered on 24 June 2011, by astronomers with the Pan-STARRS 1 at the Haleakala Obs. in Hawaii. Naming and numbering 2025, 2011 MM 4 has not been numbered or named by the Minor Planet Center. Orbit and classification 2011 MM 4 orbits the Sun at a distance of 11.1–31.2 AU once every 97 years and 2 months (35,473 days; semi-major axis of 21.13 AU). Its orbit has an eccentricity of 0.47 and an inclination of 100° with respect to the ecliptic. The body's observation arc begins at Pan-STARRS in June 2010. Retrograde centaur and damocloid 2011 MM 4 is a member of the centaurs, a population of inward-moving bodies transiting from the Kuiper belt to the group of Jupiter-family comets. Orbiting mainly between Jupiter and Neptune, they typically have a semi-major axis of 5.5 to 30.1 AU. Centaurs are cometary-like bodies with an eccentric orbit. Their short dynamical lifetime is due to the perturbing forces exerted on them by the outer planets of the Solar System. The object is on a retrograde orbit as it has an inclination of more than 90°. There are only about a hundred known retrograde minor planets out of nearly 800,000 observed bodies, and, together with 468861 2013 LU 28 and 342842 2008 YB 3, it is among the largest such objects. The object also meets the orbital definition for being a damocloid. This is a small group of cometary-like objects without a coma or tail and a Tisserand's parameter with respect to Jupiter of less than 2 besides a retrograde orbit. Physical characteristics Diameter and albedo According to the survey of centaurs and scattered-disk objects carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 2011 MM 4 measures 64 kilometers in diameter and its surface has an albedo of 0.083, which makes it too small to be considered as a dwarf-planet candidate. Rotation period 2021, no rotational lightcurve of has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. See also List of centaurs (small Solar System bodies) 2011 MM4 References 30em 2017-10-29 last obs. JPL Small-Body Database Browser: 2011 MM4 https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011%20MM4 Jet Propulsion Laboratory 18 October 2018 2011 MM4 Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=2011+mm4 18 October 2018 List of Known Trans-Neptunian Objects Johnston's Archive 7 October 2018 Johnston Wm. Robert http://www.johnstonsarchive.net/astro/tnoslist.html 17 October 2018 List Of Centaurs and Scattered-Disk Objects Minor Planet Center https://www.minorplanetcenter.net/iau/lists/t_centaurs.html 18 October 2018 C. de la Fuente Marcos R. de la Fuente Marcos August 2014 Large retrograde Centaurs: visitors from the Oort cloud? Astrophysics and Space Science 352 2 409–419(Ap&SSHomepage) 2014Ap&SS.352..409D 10.1007/s10509-014-1993-9 1406.1450 189843380 6 James M. Bauer Tommy Grav Erin Blauvelt A. K. Mainzer Joseph R. Masiero Rachel Stevenson Emily Kramer Yan R. Fernández C. M. Lisse Roc M. Cutri Paul R. Weissman John W. Dailey Frank J. Masci Russel Walker Adam Waszczak Carrie R. Nugent Karen J. Meech Andrew Lucas George Pearman Ashlee Wilkins Jessica Watkins Shrinivas Kulkarni Edward L. Wright WISE Team PTF Team August 2013 Centaurs and Scattered Disk Objects in the Thermal Infrared: Analysis of WISE/NEOWISE Observations The Astrophysical Journal 773 1 11 2013ApJ...773...22B 10.1088/0004-637X/773/1/22 1306.1862 51139703 N. Peixinho A. Doressoundiram A. Delsanti H. Boehnhardt M. A. Barucci I. Belskaya October 2003 Reopening the TNOs color controversy: Centaurs bimodality and TNOs unimodality Astronomy and Astrophysics 410 3 L29–L32 2003A&A...410L..29P 10.1051/0004-6361:20031420 astro-ph/0309428 8515984 342842 18 October 2018 External links List Of Centaurs and Scattered-Disk Objects, Minor Planet Center 2011+MM4 2011+MM4 # 2011 MM4 Category:Minor planet object articles (unnumbered) # 20110624 Category:Minor planets with a retrograde orbit