+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   187075 (2005 NA31) Classification: Main-belt Asteroid          SPK-ID: 2187075 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2224089460925113 3.9973e-08   a 2.449957958420521 1.2467e-08 au q 1.905065390917253 9.9296e-08 au i 2.671268957978609 3.8272e-06 deg node 146.0992685643023 0.0001062 deg peri 217.7150248490081 0.0001066 deg M 324.0215846345908 1.099e-05 deg tp 2459340.483196151927 (2021-May-05.98319615) 4.3348e-05 TDB period 1400.671766748904 3.83 1.0691e-05 2.927e-08 d yr n .2570195305896649 1.9618e-09 deg/d Q 2.99485052592379 1.5239e-08 au   Orbit Determination Parameters    # obs. used (total)      455      data-arc span      9407 days (25.75 yr)      first obs. used      1994-12-08      last obs. used      2020-09-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55045      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 21:53:56   Additional Information  Earth MOID = .902022 au   Jupiter MOID = 2.46376 au   T_jup = 3.460  [ 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 16.77   n/a E2021B55   187075 (2005 NA31)          Discovered 2005-Jul-04 by Mt. Lemmon Survey at Mount Lemmon Reference: 20080520/Numbers.arc Last Updated: 2008-05-22 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-16 18:40 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin