+ 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 57 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2057618703061339 2.1381e-08   a 3.094725728442804 8.74e-09 au q 2.4579491744739 6.8137e-08 au i 4.648662648537075 1.4388e-06 deg node 300.5729240672022 1.2854e-05 deg peri 284.0688180409799 1.5804e-05 deg M 297.6925814596111 4.8557e-06 deg tp 2459544.666767402836 (2021-Nov-26.16676740) 2.7178e-05 TDB period 1988.52783773583 5.44 8.4239e-06 2.306e-08 d yr n .1810384512443647 7.6692e-10 deg/d Q 3.731502282411708 1.0538e-08 au   Orbit Determination Parameters    # obs. used (total)      4744      data-arc span      43896 days (120.18 yr)      first obs. used      1901-01-13      last obs. used      2021-03-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .3855      source      ORB      producer      Otto Matic      solution date      2021-May-03 18:26:36   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-Jun-19 17:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin