+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21813 Danwinegar (1999 TK25) Classification: Main-belt Asteroid          SPK-ID: 2021813 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1632797907908803 4.2684e-08   a 2.431981092980255 1.1016e-08 au q 2.034887728911063 1.0832e-07 au i 2.987187017696007 4.6063e-06 deg node .639153528080514 7.3054e-05 deg peri 229.0741771856555 7.4401e-05 deg M 357.7483941917329 1.7484e-05 deg tp 2459209.164202175260 (2020-Dec-25.66420218) 6.731e-05 TDB period 1385.283681380371 3.79 9.4122e-06 2.577e-08 d yr n .2598745692588226 1.7657e-09 deg/d Q 2.829074457049448 1.2815e-08 au   Orbit Determination Parameters    # obs. used (total)      1404      data-arc span      9056 days (24.79 yr)      first obs. used      1995-08-23      last obs. used      2020-06-08      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .48877      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:54:50   Additional Information  Earth MOID = 1.02502 au   Jupiter MOID = 2.16593 au   T_jup = 3.487  [ 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 14.71   n/a E2021B10   diameter diameter 5.971 km 0.115 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.079   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21813 Danwinegar           Discovered 1999 Oct. 3 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Daniel Rees Winegar (b. 1986) was awarded second place in the 2005 Intel International Science and Engineering Fair for his engineering team project. He attends the Copper Hills High School, West Jordan, Utah, 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: 20050822/MPCPages.arc Last Updated: 2005-08-26 Alternate Designations  1999 TK25 = 1995 QW9  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-10 20:19 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin