+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   305974 (2009 HS85) Classification: Main-belt Asteroid          SPK-ID: 2305974 [ 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 10 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1304248574166042 1.4597e-07   a 2.627089028587295 4.6679e-08 au q 2.284451316613072 4.1483e-07 au i 8.936145259801146 8.9375e-06 deg node 188.5570808868474 3.6357e-05 deg peri 336.8918077541097 4.278e-05 deg M 300.3351993825082 2.5636e-05 deg tp 2459458.266399801220 (2021-Aug-31.76639980) 0.0001151 TDB period 1555.28725426151 4.26 4.1453e-05 1.135e-07 d yr n .2314684949764712 6.1693e-09 deg/d Q 2.969726740561518 5.2768e-08 au   Orbit Determination Parameters    # obs. used (total)      165      data-arc span      6673 days (18.27 yr)      first obs. used      2002-10-05      last obs. used      2021-01-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57088      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 20:16:42   Additional Information  Earth MOID = 1.29343 au   Jupiter MOID = 2.01116 au   T_jup = 3.373  [ hide covariance matrix ] Orbital Elements at Epoch 2457045.5 (2015-Jan-23.0) TDB Reference: JPL 10 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1296752883818737 1.4688e-07   q 2.286741913888757 4.1729e-07 au tp 2456349.697477060328 (2013-Feb-26.19747706) 8.7866e-05 TDB node 188.589658215043 3.6327e-05 deg peri 337.2872864481249 4.2688e-05 deg i 8.938329048542451 8.942e-06 deg   Orbit Determination Parameters    # obs. used (total)      165      data-arc span      6673 days (18.27 yr)      first obs. used      2002-10-05      last obs. used      2021-01-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57088      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 20:16:42   Additional Information  Jupiter MOID = 2.01116 au   T_jup = 3.373  Orbit Covariance (6×6)   e q tp node peri i e 2.157353273475345E-14 -6.116409031628873E-14 2.630531167268433E-12 -1.25979166295659E-13 9.49820688845662E-13 -8.531510618184715E-14 q -6.116409031628873E-14 1.741335469615504E-13 -7.192982384631828E-12 3.563135129990861E-13 -2.558194910788113E-12 2.44802274793352E-13 tp 2.630531167268433E-12 -7.192982384631828E-12 7.72036013928463E-9 -1.876524595601916E-11 1.974208245840765E-9 -3.567170383110711E-12 node -1.25979166295659E-13 3.563135129990861E-13 -1.876524595601916E-11 1.319660782060652E-9 -1.30883588737772E-9 -1.000278005548215E-10 peri 9.49820688845662E-13 -2.558194910788113E-12 1.974208245840765E-9 -1.30883588737772E-9 1.822261966345912E-9 9.773425287480124E-11 i -8.531510618184715E-14 2.44802274793352E-13 -3.567170383110711E-12 -1.000278005548215E-10 9.773425287480124E-11 7.99600775424865E-11 [ 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 16.8   n/a MPO494624   305974 (2009 HS85)          Discovered 2009-Apr-29 by Spacewatch at Kitt Peak Reference: 20111110/Numbers.arc Last Updated: 2011-11-14 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-25 19:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin