+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21571 Naegeli (1998 RD51) Classification: Main-belt Asteroid          SPK-ID: 2021571 [ 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 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05709057047800716 3.3701e-08   a 2.649270054821328 9.9302e-09 au q 2.498021716041277 8.775e-08 au i 5.11567689783621 3.9427e-06 deg node 234.0610807529104 3.4893e-05 deg peri 36.76115911266837 4.8266e-05 deg M 138.3869802861471 3.407e-05 deg tp 2458595.046903335040 (2019-Apr-21.54690334) 0.00014821 TDB period 1575.026164663008 4.31 8.8554e-06 2.424e-08 d yr n .2285676314952046 1.2851e-09 deg/d Q 2.800518393601379 1.0497e-08 au   Orbit Determination Parameters    # obs. used (total)      2069      data-arc span      14330 days (39.23 yr)      first obs. used      1981-10-24      last obs. used      2021-01-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47679      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:53:20   Additional Information  Earth MOID = 1.48246 au   Jupiter MOID = 2.24104 au   T_jup = 3.383  [ 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 13.69   n/a E2021B10   diameter diameter 4.958 km 0.123 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.286   0.046 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21571 Naegeli           Discovered 1998 Sept. 14 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Kaleb Markus Naegeli (b. 1987) was awarded first place in the 2006 Intel International Science and Engineering Fair for his medicine and health project. He attends the Northwestern High School, Kokomo, Indiana, 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 [ show close-approach data ] Alternate Designations  1998 RD51 = 1981 UA29  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-10 12:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin