+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   465 Alekto (A901 AC) Classification: Main-belt Asteroid          SPK-ID: 2000465 [ 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 54 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2057618962411084 3.0014e-08   a 3.094725713577748 1.0279e-08 au q 2.457949082405873 9.4072e-08 au i 4.648662827865488 3.4546e-06 deg node 300.5729361755929 4.1991e-05 deg peri 284.0687912533771 4.2761e-05 deg M 297.6926008486524 9.7438e-06 deg tp 2459544.666657824082 (2021-Nov-26.16665782) 5.466e-05 TDB period 1988.527823408432 5.44 9.9072e-06 2.712e-08 d yr n .1810384525487518 9.0196e-10 deg/d Q 3.731502344749623 1.2394e-08 au   Orbit Determination Parameters    # obs. used (total)      4556      data-arc span      43841 days (120.03 yr)      first obs. used      1901-01-13      last obs. used      2021-01-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .39046      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:46:53   Additional Information  Earth MOID = 1.45294 au   Jupiter MOID = 1.32247 au   T_jup = 3.186  [ 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 9.83   n/a E2021B10   diameter diameter 73.34 km 2.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17 rotation period rot_per 10.936 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pilcher, F. (2013) Minor Planet Bull. 40, 33.] [Pilcher, F. (2015) Minor Planet Bull. 42, 91-94.] [Pilcher, F. (2016) Minor Planet Bull. 43, 296-299.] geometric albedo albedo 0.0433   0.004 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17 465 Alekto (A901 AC)          Discovered 1901-Jan-13 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A901 AC = 1949 YE1 = 1949 YU = 1968 PB = A907 EF = A916 YC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-07 09:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin