+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120805 (1998 FF138) Classification: Main-belt Asteroid          SPK-ID: 2120805 [ 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 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1380040014828673 6.0615e-08   a 2.614312830753908 1.4538e-08 au q 2.253527198981867 1.582e-07 au i 4.135282226407946 7.8966e-06 deg node 8.217437098051313 5.8215e-05 deg peri 214.0483370732913 6.2937e-05 deg M 64.87856061286834 2.1672e-05 deg tp 2458722.251095090358 (2019-Aug-26.75109509) 9.2819e-05 TDB period 1543.95542720476 4.23 1.2879e-05 3.526e-08 d yr n .2331673529279008 1.945e-09 deg/d Q 2.97509846252595 1.6544e-08 au   Orbit Determination Parameters    # obs. used (total)      475      data-arc span      8644 days (23.67 yr)      first obs. used      1995-09-17      last obs. used      2019-05-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .59016      source      ORB      producer      Otto Matic      solution date      2019-Jul-13 06:24:45   Additional Information  Earth MOID = 1.24667 au   Jupiter MOID = 2.00885 au   T_jup = 3.391  [ 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 16.0   n/a MPO432708   diameter diameter 3.463 km 0.159 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.077   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   120805 (1998 FF138)          Discovered 1998-Mar-28 by LINEAR at Socorro Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 [ show close-approach data ] Alternate Designations  1998 FF138 = 2002 CB109  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-26 17:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin