+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3643 Tienchanglin (1978 UN2) Classification: Main-belt Asteroid          SPK-ID: 2003643 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1509141504462244 4.2479e-08   a 2.402470441899826 7.8403e-09 au q 2.039903656188348 1.0166e-07 au i 13.87823578628933 4.7181e-06 deg node 56.7781579984331 1.4635e-05 deg peri 4.455325592897768 2.084e-05 deg M 46.93046101893443 1.2735e-05 deg tp 2458823.188123356132 (2019-Dec-05.68812336) 4.8265e-05 TDB period 1360.145930934684 3.72 6.6581e-06 1.823e-08 d yr n .2646774818879987 1.2956e-09 deg/d Q 2.765037227611303 9.0235e-09 au   Orbit Determination Parameters    # obs. used (total)      2079      data-arc span      30302 days (82.96 yr)      first obs. used      1937-11-30      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43126      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:13:21   Additional Information  Earth MOID = 1.05276 au   Jupiter MOID = 2.58341 au   T_jup = 3.470  [ 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 13.0   n/a MPO358664   diameter diameter 9.775 km 0.167 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.135   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   3643 Tienchanglin           Discovered 1978 Oct. 29 at the Purple Mountain Observatory. Chang-lin Tien (b. 1935) was the seventh chancellor of the University of California at Berkeley, serving from 1990 to 1997, and is now the Nippon Electric Company distinguished professor of engineering there. His professional work is mainly in energy, environment and high-tech areas. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 19990928/MPCPages.arc Last Updated: 2010-06-11 [ show close-approach data ] Alternate Designations  1978 UN2 = 1937 WK = 1963 TY = 1967 TJ = 1978 WY14 = 1983 AS  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-26 03:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin