+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3089 Oujianquan (1981 XK2) Classification: Main-belt Asteroid          SPK-ID: 2003089 [ 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 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1867346511815098 4.8354e-08   a 2.928485139453672 1.4175e-08 au q 2.381635488447556 1.4453e-07 au i 16.70117255193011 5.1747e-06 deg node 88.21649045829777 1.2554e-05 deg peri 184.0874816525335 1.6369e-05 deg M 54.41098290209934 9.7709e-06 deg tp 2458723.839578555674 (2019-Aug-28.33957856) 4.9498e-05 TDB period 1830.471467482252 5.01 1.329e-05 3.639e-08 d yr n .1966706427252686 1.4279e-09 deg/d Q 3.475334790459789 1.6822e-08 au   Orbit Determination Parameters    # obs. used (total)      2408      data-arc span      20222 days (55.36 yr)      first obs. used      1964-06-11      last obs. used      2019-10-23      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42159      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 16:38:22   Additional Information  Earth MOID = 1.36571 au   Jupiter MOID = 1.647 au   T_jup = 3.189  [ 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 11.3   n/a MPO492787   diameter diameter 35.887 km 0.104 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 14.328 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Clark, M. (2015) Minor Planet Bull. 42, 15-20.] geometric albedo albedo 0.050   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   3089 Oujianquan (1981 XK2)          Discovered 1981-Dec-03 by Purple Mountain Observatory at Nanking Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1981 XK2 = 1934 NF = 1944 MD = 1964 LA = 1974 ML = 1976 YU2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-03 18:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin