+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21416 Sisichen (1998 FN70) Classification: Main-belt Asteroid          SPK-ID: 2021416 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1514410484239022 3.317e-08   a 2.413358543211892 8.516e-09 au q 2.047876995205102 7.9804e-08 au i 6.517905360961672 4.2342e-06 deg node 30.80692878695379 2.6556e-05 deg peri 292.5325777963743 2.9664e-05 deg M 318.2195909115231 1.4332e-05 deg tp 2459555.428354302462 (2021-Dec-06.92835430) 5.4825e-05 TDB period 1369.402760698819 3.75 7.2483e-06 1.984e-08 d yr n .2628883264528316 1.3915e-09 deg/d Q 2.778840091218682 9.8056e-09 au   Orbit Determination Parameters    # obs. used (total)      1611      data-arc span      13427 days (36.76 yr)      first obs. used      1984-09-23      last obs. used      2021-06-28      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .53989      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 05:07:51   Additional Information  Earth MOID = 1.04606 au   Jupiter MOID = 2.55447 au   T_jup = 3.494  [ 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 14.83   n/a E2021B10   21416 Sisichen           Discovered 1998 Mar. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Sisi Monica Chen (b. 1987) is a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors, for her mathematics project. She attends the Northview High School, Duluth, Georgia. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20050224/MPCPages.arc Last Updated: 2005-02-28 Alternate Designations  1998 FN70 = 1984 SO6  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Aug-01 05:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin