+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   249018 (2007 RF139) Classification: Main-belt Asteroid          SPK-ID: 2249018 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09667931310136701 4.3773e-08   a 2.406068154516058 1.6957e-08 au q 2.173451138062372 1.0989e-07 au i 4.383133509306852 5.2017e-06 deg node 215.2448470141083 6.6145e-05 deg peri 64.05878336867337 7.2119e-05 deg M 253.6678953761501 2.9943e-05 deg tp 2459603.144919479268 (2022-Jan-23.64491948) 0.00011348 TDB period 1363.20231340577 3.73 1.4411e-05 3.946e-08 d yr n .2640840588808792 2.7917e-09 deg/d Q 2.638685170969745 1.8596e-08 au   Orbit Determination Parameters    # obs. used (total)      256      data-arc span      8490 days (23.24 yr)      first obs. used      1998-01-31      last obs. used      2021-04-30      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49624      source      ORB      producer      Otto Matic      solution date      2021-May-04 11:11:59   Additional Information  Earth MOID = 1.1596 au   Jupiter MOID = 2.45006 au   T_jup = 3.512  [ hide covariance matrix ] Orbital Elements at Epoch 2457660.5 (2016-Sep-29.0) TDB Reference: JPL 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09756163456735976 4.3671e-08   q 2.170697050421805 1.0969e-07 au tp 2458239.284834295207 (2018-Apr-30.78483430) 0.00011294 TDB node 215.2748547850489 6.6171e-05 deg peri 63.97162759989755 7.2069e-05 deg i 4.382167942849322 5.2026e-06 deg   Orbit Determination Parameters    # obs. used (total)      256      data-arc span      8490 days (23.24 yr)      first obs. used      1998-01-31      last obs. used      2021-04-30      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49624      source      ORB      producer      Otto Matic      solution date      2021-May-04 11:11:59   Additional Information  Jupiter MOID = 2.45006 au   T_jup = 3.512  Orbit Covariance (6×6)   e q tp node peri i e 1.907132593677527E-15 -4.746477039545336E-15 4.735297589533181E-13 4.17124656821599E-15 1.456357646045376E-13 -5.8252417199621E-16 q -4.746477039545336E-15 1.203273580292221E-14 -1.285560803929964E-12 -1.036411352793837E-14 -4.099923089721537E-13 1.730465971652086E-15 tp 4.735297589533181E-13 -1.285560803929964E-12 1.275626792074658E-8 5.863858270625804E-11 3.246320810553251E-9 -3.486110641142585E-12 node 4.17124656821599E-15 -1.036411352793837E-14 5.863858270625804E-11 4.37863042291244E-9 -4.350264042709433E-9 -4.810415911583601E-11 peri 1.456357646045376E-13 -4.099923089721537E-13 3.246320810553251E-9 -4.350264042709433E-9 5.1938851263613E-9 4.704824442321402E-11 i -5.8252417199621E-16 1.730465971652086E-15 -3.486110641142585E-12 -4.810415911583601E-11 4.704824442321402E-11 2.706661574605119E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.9   n/a MPO454844   diameter diameter 2.625 km 0.142 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.049   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   249018 (2007 RF139)          Discovered 2007-Sep-15 by Ferrando, R. at Pla D'Arguines Reference: 20100824/Numbers.arc Last Updated: 2010-08-27 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-May-06 02:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin