+ 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 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2542980199490903 3.6279e-08   a 2.352051536961884 6.6632e-09 au q 1.753929488294262 8.487e-08 au i 24.87190532870694 4.8574e-06 deg node 146.1395151423658 8.1461e-06 deg peri 229.1269434176444 1.2344e-05 deg M 134.873401281695 1.1627e-05 deg tp 2458506.880297153542 (2019-Jan-23.38029715) 4.1813e-05 TDB period 1317.554768664699 3.61 5.5988e-06 1.533e-08 d yr n .273233423430928 1.1611e-09 deg/d Q 2.950173585629505 8.3576e-09 au   Orbit Determination Parameters    # obs. used (total)      2588      data-arc span      26964 days (73.82 yr)      first obs. used      1946-08-21      last obs. used      2020-06-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38509      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:33:03   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 6.683 h n/a LCDB (Rev. 2019-August); 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.] 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 ] 2020-Jul-10 02:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin