+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1568 Aisleen (1946 QB) Classification: Main-belt Asteroid          SPK-ID: 2001568 [ 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 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2542980202368623 3.6278e-08   a 2.352051536845237 6.6621e-09 au q 1.753929487530424 8.4866e-08 au i 24.87190532040446 4.8562e-06 deg node 146.139515167777 8.1417e-06 deg peri 229.1269436287222 1.234e-05 deg M 134.8734011713981 1.1626e-05 deg tp 2458506.880297593936 (2019-Jan-23.38029759) 4.1811e-05 TDB period 1317.554768566685 3.61 5.5979e-06 1.533e-08 d yr n .273233423451254 1.1609e-09 deg/d Q 2.95017358616005 8.3563e-09 au   Orbit Determination Parameters    # obs. used (total)      2600      data-arc span      26991 days (73.90 yr)      first obs. used      1946-08-21      last obs. used      2020-07-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38462      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:17:42   Additional Information  Earth MOID = .815203 au   Jupiter MOID = 2.64455 au   T_jup = 3.392  [ 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 11.7   n/a MPO263359   diameter diameter 12.448 km 0.084 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 6.6746 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Malcolm, G. (2001) Minor Planet Bull. 28, 64.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Warner, Brian D. (2014) Minor Planet Bull. 41, 235-241.] [Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.165   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1568 Aisleen (1946 QB)          Discovered 1946-Aug-21 by Johnson, E. L. at Johannesburg (UO) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-27 22:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin