+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   283 Emma Classification: Main-belt Asteroid          SPK-ID: 2000283 [ 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 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .14870385326109 6.3132e-08   a 3.047489618256508 1.3068e-08 AU q 2.594316169248597 1.9186e-07 AU i 7.992638827307021 6.8564e-06 deg node 304.3761219665133 4.5924e-05 deg peri 53.61952047854297 5.0439e-05 deg M 264.7707525879339 2.5037e-05 deg tp 2456914.519542164333 (2014-Sep-14.01954216) 0.00013671 JED period 1943.174394505539 5.32 1.2499e-05 3.422e-08 d yr n .1852638656715141 1.1916e-09 deg/d Q 3.500663067264419 1.5011e-08 AU   Orbit Determination Parameters    # obs. used (total)      1372      data-arc span      43310 days (118.58 yr)      first obs. used      1894-01-11      last obs. used      2012-08-10      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .57459      data source      ORB      producer      Otto Matic      solution date      2013-Mar-29 14:43:41   Additional Information  Earth MOID = 1.59907 AU   T_jup = 3.206  [ 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 8.72 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4 diameter diameter 148.06 km 4.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4 rotation period rot_per 6.896 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Stanzel, R. (1978) Astron. Astrophys. Suppl. Ser. 34, 373-376.] [Michalowski, T.; Kaasalainen, M.; Polinska, M.; Marciniak, A.; et al. (2006) Astron. Astrophys. 459, 663-668.] [Strabla, L.; Quadri, U.; Girelli, R. (2011) Minor Planet Bul. 38, 169-172.] [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J. (2011) Database of Asteroid Models from Inversion Techniques (DAMIT). http://astro.troja.mff.cuni.cz/projects/aster oids3D/web.php] geometric albedo albedo 0.0262   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4 B-V BV .712 mag .031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=1; phase=18.01 deg. U-B UB .297 mag .034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=1; phase=18.01 deg. Tholen spectral type spec_T X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 283 Emma          Discovered 1889-Feb-08 by Charlois, A. at Nice Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1980 FJ12  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-Jun-19 14:32 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin