+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   187466 (2005 YR171) Classification: Main-belt Asteroid          SPK-ID: 2187466 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3411595849760602 7.5341e-08   a 2.553558262621018 1.9985e-08 au q 1.682387385533042 1.9886e-07 au i 5.736382694002707 6.1436e-06 deg node 154.0719275371144 5.9484e-05 deg peri 185.5640533056253 6.0369e-05 deg M 300.4709062502432 9.3561e-06 deg tp 2459446.958530149295 (2021-Aug-20.45853015) 3.8678e-05 TDB period 1490.448875750084 4.08 1.7498e-05 4.791e-08 d yr n .2415379727928113 2.8356e-09 deg/d Q 3.424729139708995 2.6804e-08 au   Orbit Determination Parameters    # obs. used (total)      597      data-arc span      14532 days (39.79 yr)      first obs. used      1980-08-04      last obs. used      2020-05-18      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .53146      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 21:55:32   Additional Information  Earth MOID = .671918 au   Jupiter MOID = 1.98617 au   T_jup = 3.348  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.02   n/a E2021B55   diameter diameter 2.181 km 0.301 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.162   0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   187466 (2005 YR171)          Discovered 2005-Dec-22 by CSS at Catalina Reference: 20080520/Numbers.arc Last Updated: 2008-05-22 [ show close-approach data ] Alternate Designations  2005 YR171 = 1980 PS4 = 2005 WD207 = 2005 WP124  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-17 18:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin