+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1522 Kokkola (1938 WO) Classification: Main-belt Asteroid          SPK-ID: 2001522 [ 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 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0725177319867004 2.4409e-08   a 2.36766953811899 5.8655e-09 au q 2.195971513120603 5.7411e-08 au i 5.351975134068315 3.1339e-06 deg node 60.61177091383929 3.6123e-05 deg peri 30.09891909890867 4.6523e-05 deg M 107.3700199116265 2.8329e-05 deg tp 2458603.618742809745 (2019-Apr-30.11874281) 0.00010473 TDB period 1330.699693509327 3.64 4.9448e-06 1.354e-08 d yr n .2705343675631324 1.0053e-09 deg/d Q 2.539367563117378 6.2908e-09 au   Orbit Determination Parameters    # obs. used (total)      2886      data-arc span      29895 days (81.85 yr)      first obs. used      1938-10-22      last obs. used      2020-08-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41094      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:18:10   Additional Information  Earth MOID = 1.21418 au   Jupiter MOID = 2.58203 au   T_jup = 3.537  [ 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 MPO492768   diameter diameter 9.422 km 0.094 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 5.83 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Binzel, R.P. (1987) Icarus 72, 135-208.] geometric albedo albedo 0.206   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.880   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=2.32 deg. U-B UB 0.510   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=2.32 deg. 1522 Kokkola (1938 WO)          Discovered 1938-Nov-18 by Oterma, L. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1938 WO = 1949 WB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 06:46 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin