+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100573 (1997 HR2) Classification: Main-belt Asteroid          SPK-ID: 2100573 [ 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 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2342721418863958 3.6974e-08   a 2.398294289461344 7.7146e-09 au q 1.836440749395323 8.8313e-08 au i 3.067625627403937 4.3179e-06 deg node 130.4503430147862 0.00010377 deg peri 172.2260740143938 0.00010465 deg M 80.30852698865898 1.4027e-05 deg tp 2458897.870474897344 (2020-Feb-18.37047490) 5.2326e-05 TDB period 1356.601012646406 3.71 6.5457e-06 1.792e-08 d yr n .2653691075298003 1.2804e-09 deg/d Q 2.960147829527365 9.5219e-09 au   Orbit Determination Parameters    # obs. used (total)      454      data-arc span      8657 days (23.70 yr)      first obs. used      1997-04-29      last obs. used      2021-01-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .56372      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:32:47   Additional Information  Earth MOID = .819162 au   Jupiter MOID = 2.28482 au   T_jup = 3.488  [ 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 16.88   n/a E2021B55   100573 (1997 HR2)          Discovered 1997-Apr-29 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2195-Oct-08 17:57 00:43 Psych 0.02932294597994 0.0292800675933556 0.0293658650947438 2.78594255474856 2.7859424066423 2523048.247703749 43.2001064965909 2741.58604402862 75.883354452239 38.8832771563109 36241.0385095231 T 18 CATAB v2.0f-lin.ifort 2021-Apr-13 15:32:48 2021-Apr-13 15:32 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-22 01:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin