+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .03878342770611665 5.5344e-08   a 3.0094429648029 2.4324e-08 au q 2.892726451141785 1.6089e-07 au i 10.84751502346962 7.1992e-06 deg node 20.25031688157912 2.2822e-05 deg peri 124.8856105310962 8.5717e-05 deg M 188.8716618337272 8.1081e-05 deg tp 2460302.956639657232 (2023-Dec-24.45663966) 0.00042907 TDB period 1906.898610559393 5.22 2.3119e-05 6.33e-08 d yr n .1887882229325203 2.2888e-09 deg/d Q 3.126159478464015 2.5267e-08 au   Orbit Determination Parameters    # obs. used (total)      878      data-arc span      10892 days (29.82 yr)      first obs. used      1990-09-25      last obs. used      2020-07-21      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .58736      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:40:09   Additional Information  Earth MOID = 1.91648 au   Jupiter MOID = 1.86056 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-Jul-31 07:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin