+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100844 (1998 HH23) Classification: Main-belt Asteroid          SPK-ID: 2100844 [ 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 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04523545383114329 4.2227e-08   a 3.118489645401607 2.092e-08 au q 2.977423351024144 1.3196e-07 au i 3.427718131548384 4.5529e-06 deg node 150.5075818453466 6.7973e-05 deg peri 52.15445881781451 8.1959e-05 deg M 359.5701253213642 4.4355e-05 deg tp 2459002.901896281544 (2020-Jun-02.40189628) 0.00024783 TDB period 2011.476144861336 5.51 2.0241e-05 5.542e-08 d yr n .1789730397348645 1.801e-09 deg/d Q 3.25955593977907 2.1867e-08 au   Orbit Determination Parameters    # obs. used (total)      650      data-arc span      8959 days (24.53 yr)      first obs. used      1995-11-15      last obs. used      2020-05-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .59874      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 20:03:56   Additional Information  Earth MOID = 1.97554 au   Jupiter MOID = 1.69844 au   T_jup = 3.213  [ 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 15.11   n/a E2021B55   diameter diameter 4.898 km 0.494 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.067   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   100844 (1998 HH23)          Discovered 1998-Apr-20 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1998 HH23 = 2001 XK78  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-01 16:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin