+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   7569 (1989 BK) Classification: Main-belt Asteroid          SPK-ID: 2007569 [ 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 .3019863908081807 9.9055e-08   a 2.551148359704338 1.2837e-08 AU q 1.780736274141014 2.5804e-07 AU i 8.76106392054947 6.8252e-06 deg node 93.21213705680537 5.8498e-05 deg peri 316.2293870216928 5.9532e-05 deg M 24.56133235716118 1.1128e-05 deg tp 2456298.956665437065 (2013-Jan-06.45666544) 4.5648e-05 JED period 1488.339472430872 4.07 1.1233e-05 3.075e-08 d yr n .2418803012810108 1.8256e-09 deg/d Q 3.321560445267661 1.6713e-08 AU   Orbit Determination Parameters    # obs. used (total)      908      data-arc span      22404 days (61.34 yr)      first obs. used      1951-12-04      last obs. used      2013-04-06      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .51925      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:26:55   Additional Information  Earth MOID = .802755 AU   T_jup = 3.359  [ 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 13.3 mag n/a PDS3 (MPC 29594)   rotation period rot_per 3.60 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: [Carbo, L.; Green, D.; Kragh, K.; Krotz, J.; et al. (2009) Minor Planet Bul. 36, 152-157.] 7569 (1989 BK)          Discovered 1989-Jan-28 by Oshima, Y. at Gekko Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1989 BK = 1951 WL = 1955 VY = 1993 BK  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-19 01:10 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin