+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   7683 Wuwenjun (1997 DE) Classification: Main-belt Asteroid          SPK-ID: 2007683 [ 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 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1228454557930912 1.9913e-08   a 2.257736182790866 6.2691e-09 au q 1.980383552355369 4.6047e-08 au i 7.061973122804783 7.7599e-07 deg node 94.21937169721429 6.5587e-06 deg peri 348.0658508206642 9.8268e-06 deg M 93.75739332202141 8.7014e-06 deg tp 2458877.790879169634 (2020-Jan-29.29087917) 2.9808e-05 TDB period 1239.105305540156 3.39 5.161e-06 1.413e-08 d yr n .2905322077069691 1.2101e-09 deg/d Q 2.535088813226364 7.0393e-09 au   Orbit Determination Parameters    # obs. used (total)      2051      data-arc span      16515 days (45.22 yr)      first obs. used      1975-12-11      last obs. used      2021-02-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44677      source      ORB      producer      Otto Matic      solution date      2021-Mar-16 20:01:47   Additional Information  Earth MOID = .99665 au   Jupiter MOID = 2.65905 au   T_jup = 3.602  [ 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 14.03   n/a E2021B10   diameter diameter 5.825 km 0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.138   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   7683 Wuwenjun           Discovered 1997 Feb. 19 by the Beijing Schmidt CCD Asteroid Program at Xinglong. Wenjun Wu (b. 1919), a member of the Chinese Academy of Sciences, is the originator in the research on mathematics mechanization in China. He made outstanding achievements in characteristic classes and imbedding classes and invented Wu's Method to prove geometry theorems by computers. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010804/MPCPages.arc Last Updated: 2009-05-11 [ show close-approach data ] Alternate Designations  1997 DE = 1975 XD7 = 1978 TN = 1983 AF6 = 1996 CC8  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-11 19:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin