+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   312041 (2007 RB209) Classification: Main-belt Asteroid          SPK-ID: 2312041 [ 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 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1626279903167525 6.6386e-08   a 2.225866413555448 1.7657e-08 au q 1.863878232005368 1.4688e-07 au i 3.318657407740856 8.0032e-06 deg node 34.71646548398009 9.5089e-05 deg peri 266.4199616767409 0.00010013 deg M 342.3710810465743 3.5742e-05 deg tp 2459059.897785248741 (2020-Jul-29.39778525) 0.0001206 TDB period 1212.961653862027 3.32 1.4433e-05 3.952e-08 d yr n .2967942134475337 3.5315e-09 deg/d Q 2.587854595105528 2.0528e-08 au   Orbit Determination Parameters    # obs. used (total)      197      data-arc span      5753 days (15.75 yr)      first obs. used      2003-05-10      last obs. used      2019-02-08      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57413      source      ORB      producer      Otto Matic      solution date      2020-Feb-25 18:43:19   Additional Information  Earth MOID = .852058 au   Jupiter MOID = 2.62431 au   T_jup = 3.626  [ 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 17.5   n/a MPO423175   rotation period rot_per 5.13 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 lower-limit; Incomplete or inconclusive result. Published Reference List: [Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.] 312041 (2007 RB209)          Discovered 2007-Sep-10 by Spacewatch at Kitt Peak Reference: 20120109/Numbers.arc Last Updated: 2012-01-11 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-03 15:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin