+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   147 Protogeneia Classification: Main-belt Asteroid          SPK-ID: 2000147 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02872572650142451 4.748e-08   a 3.136574966399761 1.5298e-08 AU q 3.046474571763747 1.4702e-07 AU i 1.930447184819502 5.4124e-06 deg node 248.3871214793142 0.00015104 deg peri 101.9901411715245 0.00017704 deg M 238.7044180655014 9.5929e-05 deg tp 2457084.135200387672 (2015-Mar-02.63520039) 0.00054288 JED period 2028.999475615395 5.56 1.4845e-05 4.064e-08 d yr n .1774273499458703 1.2981e-09 deg/d Q 3.226675361035775 1.5738e-08 AU   Orbit Determination Parameters    # obs. used (total)      1341      data-arc span      47171 days (129.15 yr)      first obs. used      1884-02-27      last obs. used      2013-04-22      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .60735      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:32:38   Additional Information  Earth MOID = 2.03998 AU   T_jup = 3.210  [ 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 8.27 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11 diameter diameter 132.93 km 5.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11 rotation period rot_per 7.8528 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Buchheim, R.K. (2005) Minor Planet Bul. 32, 35-36.] [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.0492   0.004 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11 B-V BV .678 mag .023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=1.00, mean=2.06, max.=3.43) deg. U-B UB .293 mag .028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=1.00, mean=2.22, max.=3.43) deg. Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 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) 147 Protogeneia          Discovered 1875-Jul-10 by Schulhof, L. at Vienna Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-19 11:26 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin