+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   74504 (1999 DF7) Classification: Main-belt Asteroid          SPK-ID: 2074504 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1858496426552427 3.1708e-08   a 2.68707533420232 1.259e-08 au q 2.187683343553102 8.4897e-08 au i 11.40846384761186 5.7116e-06 deg node 42.36514619608815 2.2498e-05 deg peri 72.56986832456829 2.9132e-05 deg M 307.631642454945 1.838e-05 deg tp 2459234.537064837496 (2021-Jan-20.03706484) 8.2867e-05 TDB period 1608.859763627519 4.40 1.1308e-05 3.096e-08 d yr n .2237609567587811 1.5727e-09 deg/d Q 3.186467324851538 1.493e-08 au   Orbit Determination Parameters    # obs. used (total)      1057      data-arc span      9798 days (26.83 yr)      first obs. used      1993-10-09      last obs. used      2020-08-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52747      source      ORB      producer      Otto Matic      solution date      2020-Aug-25 07:12:44   Additional Information  Earth MOID = 1.23535 au   Jupiter MOID = 2.05598 au   T_jup = 3.321  [ 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 14.8   n/a MPO359267   diameter diameter 6.139 km 0.198 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.068   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   74504 (1999 DF7)          Discovered 1999-Feb-18 by LONEOS at Anderson Mesa Reference: 20040415/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 DF7 = 1993 TM33  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-25 18:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin