+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 51 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2546525344492828 1.2239e-08   a 2.35142740864891 6.0299e-09 au q 1.752630459462955 2.7984e-08 au i 24.8735129533541 7.5176e-07 deg node 146.1431295951514 2.253e-06 deg peri 229.1159480768391 5.3976e-06 deg M 243.1131684094431 4.6906e-06 deg tp 2459824.120854272519 (2022-Sep-01.62085427) 1.8114e-05 TDB period 1317.03037410883 3.61 5.066e-06 1.387e-08 d yr n .2733422152420702 1.0514e-09 deg/d Q 2.950224357834863 7.5655e-09 au   Orbit Determination Parameters    # obs. used (total)      3152      data-arc span      27340 days (74.85 yr)      first obs. used      1946-08-21      last obs. used      2021-06-28      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .36268      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:31:30   Additional Information  Earth MOID = .813149 au   Jupiter MOID = 2.64571 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 11.80   n/a MPO614063   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-Jul-29 23:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin