+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1616 Filipoff (1950 EA) Classification: Main-belt Asteroid          SPK-ID: 2001616 [ 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 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0188379226212149 3.6097e-08   a 2.912104515947913 1.0103e-08 au q 2.857246516411596 1.0514e-07 au i 8.47725902192437 4.0496e-06 deg node 48.25119159435944 1.9997e-05 deg peri 11.17571739305288 8.47e-05 deg M 221.3917884028885 8.3424e-05 deg tp 2459899.368269664065 (2022-Nov-15.86826966) 0.0004218 TDB period 1815.134718066778 4.97 9.4464e-06 2.586e-08 d yr n .1983323862503277 1.0322e-09 deg/d Q 2.966962515484231 1.0294e-08 au   Orbit Determination Parameters    # obs. used (total)      3061      data-arc span      33496 days (91.71 yr)      first obs. used      1929-01-16      last obs. used      2020-10-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42685      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:17:10   Additional Information  Earth MOID = 1.86763 au   Jupiter MOID = 2.09295 au   T_jup = 3.266  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.30   n/a E2021B10   diameter diameter 23.715 km 0.184 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 5.652 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Ruthroff, J.C. (2013) Minor Planet Bull. 40, 90-91.] geometric albedo albedo 0.083   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   1616 Filipoff (1950 EA)          Discovered 1950-Mar-15 by Boyer, L. at Algiers Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1950 EA = 1929 BB = 1957 UG  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-07 22:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin