+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   2145 Blaauw (1976 UF) Classification: Outer Main-belt Asteroid          SPK-ID: 2002145 [ 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 .09563859090856644 9.7376e-08   a 3.21875632645056 3.4119e-08 AU q 2.910919006910795 3.2744e-07 AU i 15.01000893743868 9.0658e-06 deg node 264.371216249922 3.2369e-05 deg peri 278.5579649942651 5.8371e-05 deg M 41.53383938237649 4.7901e-05 deg tp 2456157.150669825024 (2012-Aug-17.65066982) 0.0002805 JED period 2109.26223449894 5.77 3.3538e-05 9.182e-08 d yr n .1706757908579911 2.7138e-09 deg/d Q 3.526593645990325 3.7383e-08 AU   Orbit Determination Parameters    # obs. used (total)      893      data-arc span      18115 days (49.60 yr)      first obs. used      1963-09-13      last obs. used      2013-04-18      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .48971      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:49:52   Additional Information  Earth MOID = 1.96072 AU   T_jup = 3.129  [ 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 10.60 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10 diameter diameter 34.20 km 1.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10 rotation period rot_per 12.141 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: [Moravec, P.; Cochren, J.; Gerhardt, M.; Harris, A.; et al. (2012) Minor Planet Bul. 39, 213-216.] geometric albedo albedo 0.0869   0.010 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10 2145 Blaauw (1976 UF)          Discovered 1976-Oct-24 by West, R. M. at La Silla (809) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1976 UF = 1929 XS = 1963 RK = 1980 TW  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-25 15:00 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin