+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   173571 (2001 BU29) Classification: Main-belt Asteroid          SPK-ID: 2173571 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1001010938858902 3.2606e-08   a 2.305542854606575 1.0542e-08 au q 2.074755492859659 7.56e-08 au i 5.471344955391256 3.9191e-06 deg node 126.8464688972182 3.8157e-05 deg peri 344.9542422768915 4.4126e-05 deg M 253.4635414383021 2.3193e-05 deg tp 2459578.902485949331 (2021-Dec-30.40248595) 8.3819e-05 TDB period 1278.669262906539 3.50 8.7701e-06 2.401e-08 d yr n .2815427025919784 1.931e-09 deg/d Q 2.536330216353491 1.1597e-08 au   Orbit Determination Parameters    # obs. used (total)      521      data-arc span      7221 days (19.77 yr)      first obs. used      2001-01-03      last obs. used      2020-10-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .5251      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 20:57:36   Additional Information  Earth MOID = 1.0917 au   Jupiter MOID = 2.53715 au   T_jup = 3.575  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.78   n/a E2021B55   rotation period rot_per 2.39 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.] 173571 (2001 BU29)          Discovered 2001-Jan-20 by LINEAR at Socorro Reference: 20080122/Numbers.arc Last Updated: 2008-01-28 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jun-19 20:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin