+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1421 Esperanto (1936 FQ) Classification: Main-belt Asteroid          SPK-ID: 2001421 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08427526658536423 3.8379e-08   a 3.088269707551718 1.2671e-08 au q 2.828004954660292 1.1884e-07 au i 9.801715731377893 4.2579e-06 deg node 42.57951775167034 1.9658e-05 deg peri 162.5643886751695 2.8118e-05 deg M 222.9712405159012 2.1697e-05 deg tp 2460151.036901789913 (2023-Jul-25.53690179) 0.00012136 TDB period 1982.308572791902 5.43 1.22e-05 3.34e-08 d yr n .1816064385440117 1.1177e-09 deg/d Q 3.348534460443144 1.3739e-08 au   Orbit Determination Parameters    # obs. used (total)      3403      data-arc span      41793 days (114.42 yr)      first obs. used      1906-10-17      last obs. used      2021-03-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41062      source      ORB      producer      Otto Matic      solution date      2021-May-03 19:28:23   Additional Information  Earth MOID = 1.82546 au   Jupiter MOID = 1.61373 au   T_jup = 3.198  [ 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 10.41   n/a MPCxxxxx   diameter diameter 43.31 km 3.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 rotation period rot_per 21.982 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Ferrero, A. (2012) Minor Planet Bull. 39, 138-139.] geometric albedo albedo 0.0714   0.011 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 1421 Esperanto (1936 FQ)          Discovered 1936-Mar-18 by Vaisala, Y. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1936 FQ = 1931 HC = 1958 GD = A906 UD = A917 XD = A920 GD  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Aug-02 05:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin