+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21596 (1998 WG7) Classification: Main-belt Asteroid          SPK-ID: 2021596 [ 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 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2305502734771179 2.3048e-08   a 2.37992419150321 5.7834e-09 au q 1.831232018297336 5.5782e-08 au i 6.08854505161876 3.0496e-06 deg node 96.97736100308597 3.1393e-05 deg peri 217.0233294660715 3.2449e-05 deg M 95.0973521670044 9.5297e-06 deg tp 2458846.250670996713 (2019-Dec-28.75067100) 3.4785e-05 TDB period 1341.044261855189 3.67 4.8882e-06 1.338e-08 d yr n .2684475152982491 9.7851e-10 deg/d Q 2.928616364709083 7.1167e-09 au   Orbit Determination Parameters    # obs. used (total)      2147      data-arc span      12665 days (34.67 yr)      first obs. used      1986-06-10      last obs. used      2021-02-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49016      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:49:42   Additional Information  Earth MOID = .819448 au   Jupiter MOID = 2.36582 au   T_jup = 3.495  [ 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 14.4   n/a MPO492977   diameter diameter 7.330 km 0.088 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.052   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21596 (1998 WG7)          Discovered 1998-Nov-23 by Urata, T. at Oohira Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1998 WG7 = 1986 LR = 1993 FU55  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-20 12:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin