+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   39805 (1997 WG2) Classification: Main-belt Asteroid          SPK-ID: 2039805 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1060456330506276 3.1212e-08   a 2.272951339366528 7.8176e-09 au q 2.031914775690133 7.0364e-08 au i 1.006618554705734 3.4035e-06 deg node 222.9390678651179 0.00020372 deg peri 253.6128415611566 0.00020471 deg M 227.4152136062247 1.9789e-05 deg tp 2459661.472297259540 (2022-Mar-22.97229726) 6.9652e-05 TDB period 1251.65210524656 3.43 6.4574e-06 1.768e-08 d yr n .2876198573796864 1.4839e-09 deg/d Q 2.513987903042923 8.6467e-09 au   Orbit Determination Parameters    # obs. used (total)      1140      data-arc span      9886 days (27.07 yr)      first obs. used      1993-09-14      last obs. used      2020-10-08      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47698      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 00:19:40   Additional Information  Earth MOID = 1.04837 au   Jupiter MOID = 2.55096 au   T_jup = 3.603  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.92   n/a E2021B10   39805 (1997 WG2)          Discovered 1997-Nov-23 by Kobayashi, T. at Oizumi Reference: 20020526/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-05 14:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin