+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3231 Mila (1972 RU2) Classification: Main-belt Asteroid          SPK-ID: 2003231 [ 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 .1269600215678771 3.3499e-08   a 2.445651188199045 8.2759e-09 au q 2.13515126059779 8.3287e-08 au i 6.374942129248327 4.5366e-06 deg node 324.3167637422135 2.5615e-05 deg peri 54.74422202746728 3.0893e-05 deg M 141.8293431327996 1.6692e-05 deg tp 2458450.131218870991 (2018-Nov-27.63121887) 6.4128e-05 TDB period 1396.980038333286 3.82 7.0909e-06 1.941e-08 d yr n .2576987430897796 1.3081e-09 deg/d Q 2.7561511158003 9.3267e-09 au   Orbit Determination Parameters    # obs. used (total)      2582      data-arc span      25863 days (70.81 yr)      first obs. used      1949-08-21      last obs. used      2020-06-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43041      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:02:04   Additional Information  Earth MOID = 1.14382 au   Jupiter MOID = 2.74025 au   T_jup = 3.479  [ 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 13.4   n/a MPO452208   diameter diameter 13.424 km 0.193 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.052   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   3231 Mila (1972 RU2)          Discovered 1972-Sep-04 by Zhuravleva, L. at Nauchnyj Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1972 RU2 = 1949 QJ1 = 1949 QN1 = 1955 EL = 1972 QJ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-25 08:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin