+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .135627745290322 4.9436e-08   a 3.210034493778006 2.1213e-08 au q 2.774664753082734 1.5554e-07 au i 3.013912630750535 5.0708e-06 deg node 137.2676057297882 9.0785e-05 deg peri 18.97174840415456 9.2052e-05 deg M 225.0828846025879 1.6958e-05 deg tp 2459787.776924168005 (2022-Jul-27.27692417) 0.00010292 TDB period 2100.694873779654 5.75 2.0823e-05 5.701e-08 d yr n .1713718658018495 1.6987e-09 deg/d Q 3.645404234473277 2.409e-08 au   Orbit Determination Parameters    # obs. used (total)      964      data-arc span      8477 days (23.21 yr)      first obs. used      1996-09-10      last obs. used      2019-11-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .59923      source      ORB      producer      Otto Matic      solution date      2019-Dec-13 23:53:50   Additional Information  Earth MOID = 1.78462 au   Jupiter MOID = 1.34223 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 13.9   n/a MPO412294   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 ] 2020-Oct-19 15:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin