+ View the NASA Portal + Near-Earth Object (NEO) Project Search JPL JPL Small-Body Database Browser Search: [ help ]   163693 Atira (2003 CP20) Classification: Interior Earth Object [NEO]          SPK-ID: 2163693 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455200.5 (2010-Jan-04.0) TDB Reference: JPL 49 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3221496560447258 2.7251e-07   a .7410559841631882 2.2904e-08 AU q .5023250537551313 1.9186e-07 AU i 25.61799926326053 5.69e-05 deg node 103.9394649590055 0.0001122 deg peri 252.9169753137533 0.00012071 deg M 75.85628730628432 0.00017136 deg tp 2455151.401973391451 (2009-Nov-15.90197340) 0.00010898 JED period 233.0102118985902 0.64 1.0803e-05 2.958e-08 d yr n 1.544996663737115 7.1628e-08 deg/d Q .9797869145712451 3.0283e-08 AU   Orbit Determination Parameters    # obs. used (total)      290      data-arc span      1916 days (5.25 yr)      first obs. used      2003-02-11      last obs. used      2008-05-11      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      quality code      1      fit RMS      .61766      data source      ORB      producer      Otto Matic      solution date      2008-May-12 00:50:33   Additional Information  Earth MOID = .207133 AU   T_jup = 7.666  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.345 mag .49947 49 autocmod 2.4a rotation period rot_per 2.9745 h n/a IAU Lightcurve Data (A.W. Harris, E-mail Mar. 2006) No lightcurve published Published Reference List: [Pravec, P., Wolf, M., Sarounova, L.: 2005, posted on WWW: http://sunkl.asu.cas.cz/~ppravec/neo.htm] 163693 Atira           Discovered 2003 Feb. 11 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Atira is the Pawnee goddess of Earth and the evening star. This is the first numbered minor planet to have an orbit completely interior to that of the earth. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20080122/MPCPages.arc Last Updated: 2008-03-05 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2009-Nov-23 19:06 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin