+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21131 (1993 FQ7) Classification: Main-belt Asteroid          SPK-ID: 2021131 [ 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 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .03843216337150671 5.4405e-08   a 3.010016229665491 2.2824e-08 au q 2.894334794176101 1.5694e-07 au i 10.83556277768481 7.2026e-06 deg node 20.38359444105473 2.2944e-05 deg peri 123.286532694839 8.7633e-05 deg M 153.4632424726709 8.311e-05 deg tp 2458387.382043299745 (2018-Sep-25.88204330) 0.0004402 TDB period 1907.44350044748 5.22 2.1696e-05 5.94e-08 d yr n .1887342927408047 2.1467e-09 deg/d Q 3.125697665154882 2.3702e-08 au   Orbit Determination Parameters    # obs. used (total)      865      data-arc span      10892 days (29.82 yr)      first obs. used      1990-09-25      last obs. used      2020-07-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .58786      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:58:45   Additional Information  Earth MOID = 1.91801 au   Jupiter MOID = 1.86369 au   T_jup = 3.222  [ 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 14.2   n/a MPO302194   diameter diameter 4.724 km 0.680 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.199   0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21131 (1993 FQ7)          Discovered 1993-Mar-17 by UESAC at La Silla Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1993 FQ7 = 1990 SG24 = 1993 HH9 = 2000 QE223  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-10 20:23 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin