+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .01948001972535336 3.6098e-08   a 2.910163531425135 1.0362e-08 au q 2.853473488428969 1.0494e-07 au i 8.481091883819605 4.0838e-06 deg node 48.27040789542978 2.0787e-05 deg peri 11.89532507659959 8.4394e-05 deg M 180.9674699212291 8.2587e-05 deg tp 2459902.286991784177 (2022-Nov-18.78699178) 0.00041723 TDB period 1813.32027704388 4.96 9.6847e-06 2.652e-08 d yr n .1985308412184531 1.0603e-09 deg/d Q 2.966853574421301 1.0564e-08 au   Orbit Determination Parameters    # obs. used (total)      2926      data-arc span      33389 days (91.41 yr)      first obs. used      1929-01-16      last obs. used      2020-06-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43511      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:33:49   Additional Information  Earth MOID = 1.86495 au   Jupiter MOID = 2.09684 au   T_jup = 3.267  [ 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 11.2   n/a MPO272644   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. 2019-August); 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 ] 2020-Aug-06 08:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin