+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21990 Garretyazzie (1999 XH22) Classification: Main-belt Asteroid          SPK-ID: 2021990 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1011577801028427 3.4394e-08   a 2.918046596503443 1.3952e-08 au q 2.622863480564499 9.8531e-08 au i 2.562018019084909 3.4809e-06 deg node 148.9657140413079 8.3559e-05 deg peri 189.4997681672201 8.5812e-05 deg M 181.6836171505976 2.0973e-05 deg tp 2460298.331718484392 (2023-Dec-19.83171848) 0.00010727 TDB period 1820.693160474062 4.98 1.3058e-05 3.575e-08 d yr n .1977268920515224 1.4181e-09 deg/d Q 3.213229712442387 1.5363e-08 au   Orbit Determination Parameters    # obs. used (total)      1868      data-arc span      10161 days (27.82 yr)      first obs. used      1993-07-12      last obs. used      2021-05-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .52474      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 18:38:37   Additional Information  Earth MOID = 1.61296 au   Jupiter MOID = 2.13097 au   T_jup = 3.272  [ 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 14.06   n/a MPCxxxxx   diameter diameter 4.772 km 0.100 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.234   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21990 Garretyazzie           Discovered 1999 Dec. 6 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Garrett Michael Yazzie (b. 1991) is a finalist in the 2005 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for his engineering project. He attends the Pinon Unified School District #4 Middle School, Pinon, Arizona. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20051019/MPCPages.arc Last Updated: 2005-10-26 Alternate Designations  1999 XH22 = 1993 OB12 = 1998 MU29  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-31 07:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin