+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   243381 Alessio (2008 YM4) Classification: Main-belt Asteroid          SPK-ID: 2243381 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2212747777112531 5.7854e-08   a 2.339485262291443 2.5277e-08 au q 1.821816180919151 1.4219e-07 au i 24.09040837983428 6.3659e-06 deg node 274.4507111730933 1.8981e-05 deg peri 332.3096723090649 2.6106e-05 deg M 281.6169737459432 2.1019e-05 deg tp 2459285.076100203912 (2021-Mar-11.57610020) 7.8868e-05 TDB period 1307.00996082179 3.58 2.1182e-05 5.799e-08 d yr n .2754378396425134 4.4639e-09 deg/d Q 2.857154343663735 3.087e-08 au   Orbit Determination Parameters    # obs. used (total)      217      data-arc span      6652 days (18.21 yr)      first obs. used      2001-11-17      last obs. used      2020-02-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47196      source      ORB      producer      Otto Matic      solution date      2020-Feb-25 09:20:01   Additional Information  Earth MOID = .826687 au   Jupiter MOID = 2.30119 au   T_jup = 3.418  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.9   n/a MPO454786   diameter diameter 1.868 km 0.521 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.242   0.128 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   243381 Alessio           Discovered 2008 Dec. 22 by G. Muler and J. M. Ruiz at Nazaret Observatory, Lanzarote. Alessio Muler (b. 2002), second son of the first discoverer, shares with his father a passion for the skies. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20100923/MPCPages.arc Last Updated: 2010-12-06 Alternate Designations  2008 YM4 = 2006 BO217  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-13 03:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin