+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   1128 Astrid (1929 EB) Classification: Main-belt Asteroid          SPK-ID: 2001128 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ 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 .04670118995023376 4.8447e-08   a 2.786627099600028 1.1664e-08 AU q 2.656488298101138 1.3558e-07 AU i 1.014810543822858 5.353e-06 deg node 59.41068996313044 0.00032642 deg peri 236.0127628994501 0.00033422 deg M 267.6992594341136 7.4644e-05 deg tp 2456836.131620873957 (2014-Jun-27.63162087) 0.00035294 JED period 1699.091280883899 4.65 1.0668e-05 2.921e-08 d yr n .2118779632679424 1.3303e-09 deg/d Q 2.916765901098918 1.2209e-08 AU   Orbit Determination Parameters    # obs. used (total)      1636      data-arc span      33946 days (92.94 yr)      first obs. used      1920-05-09      last obs. used      2013-04-17      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .57175      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:41:55   Additional Information  Earth MOID = 1.64067 AU   T_jup = 3.329  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 10.70 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5 diameter diameter 34.69 km 2.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5 rotation period rot_per 10.228 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. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.0770   0.010 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5 SMASSII spectral type spec_B C   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) 1128 Astrid (1929 EB)          Discovered 1929-Mar-10 by Delporte, E. at Uccle (012) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1929 EB = 1949 QF2 = 1954 UL3 = 1964 VW = 1972 LM1 = A917 SQ = A920 JA  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-22 19:48 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin