+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15055 (1998 YS9) Classification: Outer Main-belt Asteroid          SPK-ID: 2015055 [ 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 27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1355906759492054 4.0921e-08   a 3.210696122694754 1.8288e-08 au q 2.775355665151079 1.3354e-07 au i 3.013847637301264 3.9382e-06 deg node 137.2654634863052 8.9677e-05 deg peri 18.87827602888532 9.0951e-05 deg M 259.4603711415586 1.6802e-05 deg tp 2459787.356621610156 (2022-Jul-26.85662161) 0.00010052 TDB period 2101.344377122375 5.75 1.7954e-05 4.916e-08 d yr n .1713188965689629 1.4637e-09 deg/d Q 3.646036580238428 2.0768e-08 au   Orbit Determination Parameters    # obs. used (total)      1193      data-arc span      8944 days (24.49 yr)      first obs. used      1996-09-10      last obs. used      2021-03-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .56348      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 00:46:19   Additional Information  Earth MOID = 1.78512 au   Jupiter MOID = 1.34091 au   T_jup = 3.175  [ 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 13.99   n/a E2021B10   diameter diameter 8.424 km 0.058 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.090   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15055 (1998 YS9)          Discovered 1998-Dec-25 by Korlevic, K., Juric, M. at Visnjan Reference: 20000523/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1998 YS9 = 1996 RY26  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-17 01:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin