+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   46778 (1998 HR51) Classification: Main-belt Asteroid          SPK-ID: 2046778 [ 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 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1216514510025541 3.2563e-08   a 2.166104633282553 6.3032e-09 au q 1.902594861620375 7.2173e-08 au i 2.890960432907503 2.9541e-06 deg node 82.10212011417541 6.8805e-05 deg peri 167.6765896457548 7.031e-05 deg M 298.3897768315954 1.5895e-05 deg tp 2459199.781899899181 (2020-Dec-16.28189990) 5.1767e-05 TDB period 1164.44122865142 3.19 5.0827e-06 1.392e-08 d yr n .3091611591397605 1.3495e-09 deg/d Q 2.429614404944731 7.07e-09 au   Orbit Determination Parameters    # obs. used (total)      1676      data-arc span      8073 days (22.10 yr)      first obs. used      1998-03-22      last obs. used      2020-04-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4716      source      ORB      producer      Otto Matic      solution date      2020-May-20 09:35:18   Additional Information  Earth MOID = .888564 au   Jupiter MOID = 2.58976 au   T_jup = 3.681  [ 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 15.3   n/a MPO502467   diameter diameter 2.177 km 0.496 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.258   0.238 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   46778 (1998 HR51)          Discovered 1998-Apr-30 by LONEOS at Anderson Mesa Reference: 20020921/Numbers.arc Last Updated: 2004-04-19 [ 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 2066-Jun-10 23:49 < 00:01 Juno 0.0303641804986831 0.0303635698844775 0.0303647912324966 8.22576280283078 8.22576275412189 2475812.492043710 0.221982481784831 301.848994861278 28.881063682055 88.1622750633919 157159.77385283 T 33 CATAB v2.0f-lin.ifort 2020-May-20 09:35:30 2020-May-20 09:35 Alternate Designations  1998 HR51 = 1999 TD17  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-24 15:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin