+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   1746 Brouwer (1963 RF) Classification: Outer Main-belt Asteroid          SPK-ID: 2001746 [ 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 .20560988195996 6.3652e-08   a 3.956993318526405 4.0557e-08 AU q 3.14339638938784 2.5201e-07 AU i 8.36157460131921 8.2285e-06 deg node 321.9996955264712 4.4536e-05 deg peri 48.13335834000779 4.8237e-05 deg M 90.37153013310206 1.8368e-05 deg tp 2455678.768704983645 (2011-Apr-27.26870498) 0.00014138 JED period 2875.056622624537 7.87 4.4202e-05 1.21e-07 d yr n .1252149252181923 1.9251e-09 deg/d Q 4.770590247664969 4.8896e-08 AU   Orbit Determination Parameters    # obs. used (total)      1176      data-arc span      26432 days (72.37 yr)      first obs. used      1940-11-29      last obs. used      2013-04-12      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .60896      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:47:10   Additional Information  Earth MOID = 2.15039 AU   T_jup = 3.004  [ 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 9.95 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 diameter diameter 64.25 km 4.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 rotation period rot_per 19.8 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: [Dahlgren, M.; Lahulla, J.F.; Lagerkvist, C.-I.; Lagerros, J.; et al. (1998) Icarus 133, 247-285.] [Slyusarev, I.G.; Shevchenko, V.G.; Belskaya, I.N.; Krugly, Yu.N.; Chiorny, V.G. (2012) ACM 2012, #6398.] geometric albedo albedo 0.0448   0.008 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 B-V BV .721 mag .023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=11.87, mean=12.43, max.=12.99) deg. U-B UB .227 mag .035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=11.87, mean=12.43, max.=12.99) deg. Tholen spectral type spec_T D   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 1746 Brouwer (1963 RF)          Discovered 1963-Sep-14 by Goethe Link Observatory at Brooklyn Discovered by the Indiana Asteroid Program, Goethe Link Observatory, University of Indiana. This program was conceived and directed by F. K. Edmondson; the plates were blinked and measured astrometrically by B. Potter and, following her retirement, by D. Owings; and the photometry was performed under the direction of T. Gehrels. During the years 1947-1967, in which the plates were exposed, a large number of people participated in various aspects of the program. Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1963 RF = 1940 WE = 1947 QA  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-22 02:20 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin