+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   243380 (2008 XN55) Classification: Outer Main-belt Asteroid          SPK-ID: 2243380 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08508368768284108 8.16e-08   a 3.246810268003688 5.6382e-08 au q 2.97055967719542 2.6917e-07 au i 9.529048349436307 6.2313e-06 deg node 121.6889451826611 5.6383e-05 deg peri 227.9846924178692 6.82e-05 deg M 122.0676083109313 4.0299e-05 deg tp 2458275.927699152225 (2018-Jun-06.42769915) 0.00023907 TDB period 2136.898001972567 5.85 5.5662e-05 1.524e-07 d yr n .1684684995108258 4.3883e-09 deg/d Q 3.523060858811955 6.118e-08 au   Orbit Determination Parameters    # obs. used (total)      250      data-arc span      7082 days (19.39 yr)      first obs. used      2000-09-04      last obs. used      2020-01-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .60642      source      ORB      producer      Otto Matic      solution date      2020-Feb-25 09:20:01   Additional Information  Earth MOID = 1.97342 au   Jupiter MOID = 1.85899 au   T_jup = 3.155  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.2   n/a MPO454785   diameter diameter 4.599 km 1.333 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.056   0.044 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   243380 (2008 XN55)          Discovered 2008-Dec-03 by Mt. Lemmon Survey at Mount Lemmon Reference: 20100626/Numbers.arc Last Updated: 2010-06-28 [ show close-approach data ] Alternate Designations  2008 XN55 = 2006 SV135  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-20 18:11 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin