+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120697 (1997 HP1) Classification: Main-belt Asteroid          SPK-ID: 2120697 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05146514789462981 6.0634e-08   a 3.129461886276659 3.2001e-08 au q 2.968403667468823 1.8613e-07 au i 11.7262476500205 8.8767e-06 deg node 198.1612535407446 2.3902e-05 deg peri 226.9895894433353 7.8265e-05 deg M 187.1919050186726 7.6385e-05 deg tp 2459971.154134327823 (2023-Jan-26.65413433) 0.00043183 TDB period 2022.101385908886 5.54 3.1016e-05 8.492e-08 d yr n .1780326162222517 2.7308e-09 deg/d Q 3.290520105084494 3.3648e-08 au   Orbit Determination Parameters    # obs. used (total)      361      data-arc span      8014 days (21.94 yr)      first obs. used      1997-04-28      last obs. used      2019-04-07      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .62468      source      ORB      producer      Otto Matic      solution date      2019-Jul-13 13:26:33   Additional Information  Earth MOID = 1.99257 au   Jupiter MOID = 1.93206 au   T_jup = 3.179  [ 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 15.2   n/a MPO296896   diameter diameter 3.929 km 0.663 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.095   0.057 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   120697 (1997 HP1)          Discovered 1997-Apr-28 by Spacewatch at Kitt Peak Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 [ show close-approach data ] Alternate Designations  1997 HP1 = 2005 QB89  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-29 12:20 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin