+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21398 Zengguoshou (1998 FX55) Classification: Main-belt Asteroid          SPK-ID: 2021398 [ 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 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1658761756101959 2.57e-08   a 2.233968097058655 6.1413e-09 au q 1.863406012683378 5.7698e-08 au i 3.605748283486812 9.8122e-07 deg node 115.6730198481458 2.3527e-05 deg peri 270.3660695125535 2.4813e-05 deg M 82.00282306493018 8.3743e-06 deg tp 2458922.694921928997 (2020-Mar-14.19492193) 2.7898e-05 TDB period 1219.59006248325 3.34 5.0291e-06 1.377e-08 d yr n .2951811523185024 1.2172e-09 deg/d Q 2.604530181433931 7.16e-09 au   Orbit Determination Parameters    # obs. used (total)      2003      data-arc span      16215 days (44.39 yr)      first obs. used      1976-10-22      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .48113      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:44:47   Additional Information  Earth MOID = .870476 au   Jupiter MOID = 2.84625 au   T_jup = 3.619  [ 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 14.4   n/a MPO337439   21398 Zengguoshou           Discovered 1998 Mar. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Zeng Guoshou (b. 1944), a 2003 Intel International Science and Engineering Fair Excellence in Teaching Award finalist, is a teacher at the First Middle School of Xiamen, Fujian, China. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20041226/MPCPages.arc Last Updated: 2004-12-25 Alternate Designations  1998 FX55 = 1976 UZ16 = 1986 VA9 = 1986 VH4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-20 11:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin