+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3960 Chaliubieju (1955 BG) Classification: Main-belt Asteroid          SPK-ID: 2003960 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2785657819160609 3.7059e-08   a 2.64176796063661 8.6177e-09 au q 1.905861803041075 9.7349e-08 au i 14.41378779696391 5.1268e-06 deg node 84.83153816689008 1.8452e-05 deg peri 12.49759096549622 2.0688e-05 deg M 86.77455618232551 9.044e-06 deg tp 2458622.466462448094 (2019-May-18.96646245) 3.8879e-05 TDB period 1568.340761463968 4.29 7.6741e-06 2.101e-08 d yr n .2295419521354262 1.1232e-09 deg/d Q 3.377674118232144 1.1018e-08 au   Orbit Determination Parameters    # obs. used (total)      2237      data-arc span      23947 days (65.56 yr)      first obs. used      1955-01-20      last obs. used      2020-08-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38532      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 03:55:38   Additional Information  Earth MOID = .924897 au   Jupiter MOID = 1.85062 au   T_jup = 3.295  [ 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 12.4   n/a MPO502191   diameter diameter 8.997 km 0.259 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 3.986 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Linder, T.; Sampson, R.; Holmes, R. (2013) Minor Planet Bull. 40, 4-6.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.288   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   3960 Chaliubieju           Discovered 1955 Jan. 20 at the Purple Mountain Observatory. Named in honor of Cha Liubieju, a friend of the discoverer. She devotes her every effort to caring for and educating sick and destitute mothers and children in China. 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 [ show close-approach data ] Alternate Designations  1955 BG = 1984 YZ3 = A921 EF  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-22 03:20 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin