+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   187801 (1999 HZ5) Classification: Main-belt Asteroid          SPK-ID: 2187801 [ 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 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2764324701664877 6.5683e-08   a 2.659040896728865 1.7713e-08 au q 1.923995653372392 1.7753e-07 au i 11.78363598551441 5.9692e-06 deg node 4.829750625348262 3.5553e-05 deg peri 298.9638908613585 3.6378e-05 deg M 275.9410653022241 1.0707e-05 deg tp 2459570.300363132415 (2021-Dec-21.80036313) 4.8902e-05 TDB period 1583.747536253176 4.34 1.5825e-05 4.333e-08 d yr n .2273089566103993 2.2713e-09 deg/d Q 3.394086140085338 2.261e-08 au   Orbit Determination Parameters    # obs. used (total)      277      data-arc span      7982 days (21.85 yr)      first obs. used      1999-04-06      last obs. used      2021-02-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .61391      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 21:56:53   Additional Information  Earth MOID = .939694 au   Jupiter MOID = 2.02555 au   T_jup = 3.302  [ 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 15.97   n/a E2021B55   diameter diameter 3.035 km 0.711 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.070   0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   187801 (1999 HZ5)          Discovered 1999-Apr-18 by Spacewatch at Kitt Peak Reference: 20080618/Numbers.arc Last Updated: 2008-06-20 [ show close-approach data ] Alternate Designations  1999 HZ5 = 2000 QZ140  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-23 12:51 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin