+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   4566 Chaokuangpiu (1981 WM4) Classification: Main-belt Asteroid          SPK-ID: 2004566 [ 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 46 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2116708980319552 1.2416e-08   a 2.836724015034931 9.5595e-09 au q 2.236272095303673 3.4602e-08 au i 10.80223870596195 5.8429e-07 deg node 252.4227395917953 3.4679e-06 deg peri 121.7304679094557 6.4484e-06 deg M 87.4539676287707 4.4655e-06 deg tp 2458776.563244701699 (2019-Oct-20.06324470) 2.0597e-05 TDB period 1745.115013594651 4.78 8.8213e-06 2.415e-08 d yr n .2062901282698032 1.0428e-09 deg/d Q 3.437175934766188 1.1583e-08 au   Orbit Determination Parameters    # obs. used (total)      2839      data-arc span      14356 days (39.30 yr)      first obs. used      1981-11-24      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .40234      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 16:30:40   Additional Information  Earth MOID = 1.25897 au   Jupiter MOID = 2.14316 au   T_jup = 3.252  [ 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 12.33   n/a E2021B10   diameter diameter 10.511 km 1.192 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.262   0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   4566 Chaokuangpiu           Discovered 1981 Nov. 27 at the Purple Mountain Observatory. Named in honor of Kuang-Piu Chao, consulting professor at Tsinghua University and Zhejiang University. For many years, he made remarkable contributions to the development of Chinese educational and cultural programs. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 19981005/MPCPages.arc Last Updated: 2009-11-17 Alternate Designations  1981 WM4 = 1986 XC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-14 04:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin