+ 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 | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1010607285746641 3.4398e-08   a 2.918206376718731 1.4467e-08 au q 2.623290314156305 9.8705e-08 au i 2.561733766863789 3.4849e-06 deg node 148.9664694619443 8.9736e-05 deg peri 189.4392039934677 9.2073e-05 deg M 143.0064827572449 2.1626e-05 deg tp 2458477.188026078321 (2018-Dec-24.68802608) 0.00010916 TDB period 1820.842703011046 4.99 1.3541e-05 3.707e-08 d yr n .197710653097428 1.4703e-09 deg/d Q 3.213122439281156 1.5929e-08 au   Orbit Determination Parameters    # obs. used (total)      1746      data-arc span      10052 days (27.52 yr)      first obs. used      1993-07-12      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53499      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:55:29   Additional Information  Earth MOID = 1.61228 au   Jupiter MOID = 2.13149 au   T_jup = 3.272  [ 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 14.02   n/a E2021B10   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 [ show close-approach data ] Alternate Designations  1999 XH22 = 1993 OB12 = 1998 MU29  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-11 05:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin