+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 45 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .01791848753068247 1.4043e-08   a 2.914495147197677 9.8885e-09 au q 2.862271802244381 4.5293e-08 au i 8.473232633155401 4.3117e-07 deg node 48.16372779080842 1.1104e-06 deg peri 9.793616243973267 5.361e-05 deg M 261.6439096667699 5.6e-05 deg tp 2459893.026221001492 (2022-Nov-09.52622100) 0.0002835 TDB period 1817.3703220099 4.98 9.2491e-06 2.532e-08 d yr n .1980884113931508 1.0081e-09 deg/d Q 2.966718492150973 1.0066e-08 au   Orbit Determination Parameters    # obs. used (total)      3229      data-arc span      33764 days (92.44 yr)      first obs. used      1929-01-16      last obs. used      2021-06-26      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42747      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:35:06   Additional Information  Earth MOID = 1.87263 au   Jupiter MOID = 2.08846 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-Jul-29 23:07 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin