+ 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 | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1513148029891651 3.518e-08   a 2.413176220678816 8.9746e-09 au q 2.048026936268663 8.3906e-08 au i 6.51797991946156 4.3214e-06 deg node 30.80821678435385 2.688e-05 deg peri 292.5403986360734 3.0138e-05 deg M 266.6685013855323 1.5057e-05 deg tp 2459555.483135501959 (2021-Dec-06.98313550) 5.8105e-05 TDB period 1369.247581768661 3.75 7.6384e-06 2.091e-08 d yr n .2629181199903869 1.4667e-09 deg/d Q 2.778325505088969 1.0333e-08 au   Orbit Determination Parameters    # obs. used (total)      1552      data-arc span      13044 days (35.71 yr)      first obs. used      1984-09-23      last obs. used      2020-06-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54662      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:57:08   Additional Information  Earth MOID = 1.04499 au   Jupiter MOID = 2.55573 au   T_jup = 3.494  [ 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 14.83   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 [ show close-approach data ] Alternate Designations  1998 FN70 = 1984 SO6  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-11 05:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin