+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100572 (1997 HJ2) Classification: Main-belt Asteroid          SPK-ID: 2100572 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1042032473351636 3.4163e-08   a 2.705771330185496 1.3297e-08 au q 2.423821171033782 8.9031e-08 au i 4.616574202133365 3.8473e-06 deg node 95.10055447509184 5.805e-05 deg peri 153.4755334508546 6.3406e-05 deg M 94.45368396427564 2.4912e-05 deg tp 2458773.968152740463 (2019-Oct-17.46815274) 0.00011246 TDB period 1625.68000070288 4.45 1.1983e-05 3.281e-08 d yr n .2214457948946596 1.6323e-09 deg/d Q 2.98772148933721 1.4682e-08 au   Orbit Determination Parameters    # obs. used (total)      494      data-arc span      10978 days (30.06 yr)      first obs. used      1990-12-19      last obs. used      2021-01-08      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .63112      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:25:41   Additional Information  Earth MOID = 1.40925 au   Jupiter MOID = 2.03542 au   T_jup = 3.353  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.83   n/a E2021B55   diameter diameter 2.762 km 0.592 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.133   0.046 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   100572 (1997 HJ2)          Discovered 1997-Apr-29 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 Alternate Designations  1997 HJ2 = 2001 FF60  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-02 05:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin