+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120730 Zhouyouyuan (1997 SN33) Classification: Main-belt Asteroid          SPK-ID: 2120730 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2355015949832947 5.554e-08   a 2.335502931072478 1.2236e-08 au q 1.78548826571675 1.282e-07 au i 1.440714965845986 4.697e-06 deg node 230.2105217143172 0.00016639 deg peri 144.0484271164801 0.0001666 deg M 110.060215613048 8.5489e-06 deg tp 2458601.937063116908 (2019-Apr-28.43706312) 2.9531e-05 TDB period 1303.674143092474 3.57 1.0245e-05 2.805e-08 d yr n .2761426249860538 2.1702e-09 deg/d Q 2.885517596428207 1.5118e-08 au   Orbit Determination Parameters    # obs. used (total)      452      data-arc span      8176 days (22.38 yr)      first obs. used      1997-09-26      last obs. used      2020-02-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57222      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 17:55:13   Additional Information  Earth MOID = .786607 au   Jupiter MOID = 2.58158 au   T_jup = 3.530  [ 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 16.98   n/a E2021B55   120730 Zhouyouyuan           Discovered 1997 Sept. 26 by Beijing Schmidt CCD Asteroid Program at Xinglong. Zhou Youyuan (b. 1938) is a leading astrophysicist and an Academician of the Chinese Academy of Sciences. He has made significant contributions to the study of quasars, active galactic nuclei, cosmology, large scale structures of the universe, and high-energy astrophysics. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2018-09-25 Last Updated: 2018-10-01 Alternate Designations  1997 SN33 = 2001 YC100  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-01 16:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin