+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   2906 Caltech (1983 AE2) Classification: Main-belt Asteroid          SPK-ID: 2002906 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1087185683775999 1.0952e-07   a 3.167728768374134 4.5047e-08 AU q 2.823337831667961 3.4654e-07 AU i 30.64797724144238 1.0379e-05 deg node 84.51751376732714 2.0444e-05 deg peri 295.300035914931 5.6573e-05 deg M 225.1937282575535 5.9908e-05 deg tp 2457171.630724159955 (2015-May-29.13072416) 0.00034821 JED period 2059.303748329785 5.64 4.3926e-05 1.203e-07 d yr n .1748163670813404 3.729e-09 deg/d Q 3.512119705080308 4.9944e-08 AU   Orbit Determination Parameters    # obs. used (total)      680      data-arc span      20417 days (55.90 yr)      first obs. used      1957-05-29      last obs. used      2013-04-22      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .51996      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:54:47   Additional Information  Earth MOID = 1.93422 AU   T_jup = 2.977  [ 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 10.00 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 13 diameter diameter 57.98 km 2.3 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 13 rotation period rot_per 11.442 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.0526   0.004 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 13 SMASSII spectral type spec_B Xc   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 2906 Caltech (1983 AE2)          Discovered 1983-Jan-13 by Shoemaker, C. at Palomar (675) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1983 AE2 = 1957 KJ = 1957 MA = 1974 LC = 1976 YS2 = 1983 CD  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-21 03:19 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin