+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21519 Josephhenry (1998 KR54) Classification: Main-belt Asteroid          SPK-ID: 2021519 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1212443345431985 2.5687e-08   a 2.397913673948063 8.9091e-09 au q 2.107180226258194 6.1979e-08 au i 14.03244308462755 4.2877e-07 deg node 104.2141384679291 1.1119e-06 deg peri 288.5135189641743 3.6607e-06 deg M 252.3871076434794 5.6065e-06 deg tp 2459605.925019918337 (2022-Jan-26.42501992) 2.3065e-05 TDB period 1356.278081320037 3.71 7.5586e-06 2.069e-08 d yr n .2654322922107682 1.4793e-09 deg/d Q 2.688647121637933 9.9892e-09 au   Orbit Determination Parameters    # obs. used (total)      1942      data-arc span      14102 days (38.61 yr)      first obs. used      1982-01-26      last obs. used      2020-09-05      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47078      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:46:52   Additional Information  Earth MOID = 1.16088 au   Jupiter MOID = 2.72302 au   T_jup = 3.477  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.99   n/a E2021B10   diameter diameter 3.764 km 0.197 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.376   0.057 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   21519 Josephhenry           Discovered 1998 May 23 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Joseph Kent Henry (b. 1989) was awarded second place in the 2006 Intel International Science and Engineering Fair for his environmental sciences team project. He attends the Bishop Moore Catholic High School, Orlando, Florida, U.S.A. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20060711/MPCPages.arc Last Updated: 2006-07-17 Alternate Designations  1998 KR54 = 1982 BK5  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-20 10:00 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin