+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1865870333565899 3.4144e-08   a 2.928214041669177 1.2306e-08 au q 2.381847270601015 9.8273e-08 au i 16.70110954767138 3.8645e-06 deg node 88.21670752072529 1.2476e-05 deg peri 184.0730432774394 1.6167e-05 deg M 93.77890662891338 9.6846e-06 deg tp 2458723.733953066434 (2019-Aug-28.23395307) 4.9106e-05 TDB period 1830.217295828078 5.01 1.1538e-05 3.159e-08 d yr n .196697955385193 1.24e-09 deg/d Q 3.474580812737338 1.4603e-08 au   Orbit Determination Parameters    # obs. used (total)      2991      data-arc span      20673 days (56.60 yr)      first obs. used      1964-06-11      last obs. used      2021-01-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38604      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:07:55   Additional Information  Earth MOID = 1.36411 au   Jupiter MOID = 1.6469 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 11.32   n/a E2020-QM5   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. 2020-October); 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 ] 2021-Feb-25 03:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin