+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   173132 (1994 RY2) Classification: Outer Main-belt Asteroid          SPK-ID: 2173132 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1419407961604535 4.5777e-08   a 3.206377639307598 3.2864e-08 au q 2.751261844393202 1.4573e-07 au i 4.55300942526703 6.5179e-06 deg node 317.5173458170155 6.3903e-05 deg peri 299.7653741856446 6.8051e-05 deg M 238.2898357453995 2.5414e-05 deg tp 2459709.497626636289 (2022-May-09.99762664) 0.00015171 TDB period 2097.106245417101 5.74 3.2242e-05 8.827e-08 d yr n .1716651222544036 2.6393e-09 deg/d Q 3.661493434221994 3.7529e-08 au   Orbit Determination Parameters    # obs. used (total)      455      data-arc span      9297 days (25.45 yr)      first obs. used      1994-08-10      last obs. used      2020-01-23      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52485      source      ORB      producer      Otto Matic      solution date      2020-Feb-24 16:59:26   Additional Information  Earth MOID = 1.73992 au   Jupiter MOID = 1.44803 au   T_jup = 3.172  [ 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 15.0   n/a MPO427056   diameter diameter 5.087 km 0.191 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.075   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   173132 (1994 RY2)          Discovered 1994-Sep-02 by Spacewatch at Kitt Peak Reference: 20080122/Numbers.arc Last Updated: 2008-01-28 [ show close-approach data ] Alternate Designations  1994 RY2 = 2000 SF27 = 2002 XZ116  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-05 08:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin