+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1668 Hanna (1933 OK) Classification: Main-belt Asteroid          SPK-ID: 2001668 [ 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 42 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2149866971487456 3.5732e-08   a 2.807189485714873 8.4307e-09 au q 2.203681089910347 9.9486e-08 au i 4.740623529696852 3.8392e-06 deg node 160.9542072348187 3.6885e-05 deg peri 191.1764788162897 3.7474e-05 deg M 186.5556586000653 7.1295e-06 deg tp 2460028.182274568274 (2023-Mar-24.68227457) 3.5312e-05 TDB period 1717.932199111171 4.70 7.7391e-06 2.119e-08 d yr n .2095542537629005 9.4402e-10 deg/d Q 3.4106978815194 1.0243e-08 au   Orbit Determination Parameters    # obs. used (total)      3171      data-arc span      31955 days (87.49 yr)      first obs. used      1933-07-24      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44416      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:57:14   Additional Information  Earth MOID = 1.19664 au   Jupiter MOID = 2.02812 au   T_jup = 3.283  [ 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 12.26   n/a E2021B10   diameter diameter 24.813 km 0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   geometric albedo albedo 0.038   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1668 Hanna (1933 OK)          Discovered 1933-Jul-24 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1933 OK = 1938 SY = 1966 QM  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-27 19:19 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin