+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1382596542505348 4.9003e-08   a 2.612720606540307 1.2961e-08 au q 2.251486758826796 1.241e-07 au i 4.137056741349407 5.5592e-06 deg node 8.191609462182399 5.4655e-05 deg peri 213.8148913797226 5.9751e-05 deg M 111.7729196198103 2.1244e-05 deg tp 2458721.570071355807 (2019-Aug-26.07007136) 9.1049e-05 TDB period 1542.545143299193 4.22 1.1478e-05 3.143e-08 d yr n .2333805279954612 1.7366e-09 deg/d Q 2.973954454253817 1.4753e-08 au   Orbit Determination Parameters    # obs. used (total)      542      data-arc span      9163 days (25.09 yr)      first obs. used      1995-09-17      last obs. used      2020-10-18      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .56204      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 17:08:13   Additional Information  Earth MOID = 1.24355 au   Jupiter MOID = 2.00846 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 16.02   n/a E2021B55   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 ] 2021-Apr-18 21:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin