+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   118413 (1999 SP1) Classification: Main-belt Asteroid          SPK-ID: 2118413 [ 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 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1895227829661138 6.2167e-08   a 3.127702687287248 2.8413e-08 au q 2.534931769701976 1.909e-07 au i 13.30773627158672 7.23e-06 deg node 212.125267199529 2.4279e-05 deg peri 236.147331422279 2.8841e-05 deg M 247.63086646292 1.8531e-05 deg tp 2459831.139476532855 (2022-Sep-08.63947653) 0.00010772 TDB period 2020.39656625911 5.53 2.7531e-05 7.538e-08 d yr n .1781828409392729 2.428e-09 deg/d Q 3.72047360487252 3.3798e-08 au   Orbit Determination Parameters    # obs. used (total)      375      data-arc span      9330 days (25.54 yr)      first obs. used      1994-11-28      last obs. used      2020-06-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55457      source      ORB      producer      Otto Matic      solution date      2020-Jun-24 01:51:55   Additional Information  Earth MOID = 1.57774 au   Jupiter MOID = 1.74444 au   T_jup = 3.145  [ 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 15.22   n/a E2021B55   diameter diameter 5.289 km 0.170 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.063   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   118413 (1999 SP1)          Discovered 1999-Sep-19 by Sarounova, L. at Ondrejov Reference: 20051116/Numbers.arc Last Updated: 2005-11-21 [ show close-approach data ] Alternate Designations  1999 SP1 = 1994 WO8  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-10 23:08 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin