+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   173355 (1999 YP2) Classification: Main-belt Asteroid          SPK-ID: 2173355 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ 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 .1251126910928307 6.0654e-08   a 2.554166476517548 1.5672e-08 au q 2.234607835141345 1.5547e-07 au i 9.938375080066272 6.9041e-06 deg node 100.5787489172228 2.22e-05 deg peri 216.756500032276 3.0238e-05 deg M 146.0870844673724 1.9368e-05 deg tp 2458395.463536986882 (2018-Oct-03.96353699) 7.8619e-05 TDB period 1490.981406596348 4.08 1.3723e-05 3.757e-08 d yr n .2414517031582692 2.2223e-09 deg/d Q 2.873725117893752 1.7633e-08 au   Orbit Determination Parameters    # obs. used (total)      316      data-arc span      7815 days (21.40 yr)      first obs. used      1998-09-22      last obs. used      2020-02-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52626      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 10:22:16   Additional Information  Earth MOID = 1.22887 au   Jupiter MOID = 2.38688 au   T_jup = 3.407  [ hide covariance matrix ] Orbital Elements at Epoch 2457131.5 (2015-Apr-19.0) TDB Reference: JPL 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1265685137325409 6.0734e-08   q 2.229960333742989 1.5591e-07 au tp 2456904.225289298224 (2014-Sep-03.72528930) 7.4398e-05 TDB node 100.6725041404571 2.2216e-05 deg peri 216.4866436845793 2.9975e-05 deg i 9.937084477292867 6.9044e-06 deg   Orbit Determination Parameters    # obs. used (total)      316      data-arc span      7815 days (21.40 yr)      first obs. used      1998-09-22      last obs. used      2020-02-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52626      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 10:22:16   Additional Information  Jupiter MOID = 2.38688 au   T_jup = 3.407  Orbit Covariance (6×6)   e q tp node peri i e 3.68857532345483E-15 -9.432453946068621E-15 -2.135965283099453E-12 9.961541263792619E-15 -5.881951633886369E-13 -6.904818207181724E-15 q -9.432453946068621E-15 2.430729240442874E-14 5.549316806791881E-12 -2.527591362807566E-14 1.531922185355272E-12 1.851173958164712E-14 tp -2.135965283099453E-12 5.549316806791881E-12 5.534994181278494E-9 -1.513855180317913E-12 1.506314405428069E-9 8.352131938942626E-12 node 9.961541263792619E-15 -2.527591362807566E-14 -1.513855180317913E-12 4.935432083792798E-10 -4.86011827779884E-10 4.786457430512565E-11 peri -5.881951633886369E-13 1.531922185355272E-12 1.506314405428069E-9 -4.86011827779884E-10 8.984873612429673E-10 -4.494513256637878E-11 i -6.904818207181724E-15 1.851173958164712E-14 8.352131938942626E-12 4.786457430512565E-11 -4.494513256637878E-11 4.767128157444113E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.0   n/a MPO449898   173355 (1999 YP2)          Discovered 1999-Dec-16 by Spacewatch at Kitt Peak Reference: 20080122/Numbers.arc Last Updated: 2008-01-28 Alternate Designations  1999 YP2 = 2005 GS47  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-20 11:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin