+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   101796 (1999 HN3) Classification: Main-belt Asteroid          SPK-ID: 2101796 [ 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 27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .102886342227597 1.2527e-07   a 2.536316223255874 1.2843e-08 au q 2.275363924312564 3.2049e-07 au i 15.73145065990678 6.4462e-06 deg node 53.7979655242051 1.5903e-05 deg peri 339.4104632402754 2.8261e-05 deg M 287.9195242922701 2.0537e-05 deg tp 2459495.905563102475 (2021-Oct-08.40556310) 8.4838e-05 TDB period 1475.378757877516 4.04 1.1206e-05 3.068e-08 d yr n .2440051397499426 1.8533e-09 deg/d Q 2.797268522199185 1.4164e-08 au   Orbit Determination Parameters    # obs. used (total)      1372      data-arc span      8319 days (22.78 yr)      first obs. used      1997-12-06      last obs. used      2020-09-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .53441      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:38:38   Additional Information  Earth MOID = 1.28786 au   Jupiter MOID = 2.61497 au   T_jup = 3.388  [ 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 14.11   n/a E2021B55   diameter diameter 3.838 km 0.107 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.362   0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   101796 (1999 HN3)          Discovered 1999-Apr-18 by CSS at Catalina 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 2193-Nov-18 03:19 00:02 Amphi 0.0364179810074861 0.0363905281386762 0.0364454360623208 4.24711258302655 4.24711254585905 2522358.638399669 2.43585593065047 1439.33390379472 108.681139301659 -18.1130547919778 15986.389314518 T 27 CATAB v2.0f-lin.ifort 2021-Apr-13 15:38:42 2021-Apr-13 15:38 Alternate Designations  1999 HN3 = 2001 UM66  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-17 20:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin