+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08442549478143371 3.838e-08   a 3.087700401634264 1.2766e-08 au q 2.82701976748946 1.188e-07 au i 9.802642706238188 4.2584e-06 deg node 42.57996837608098 1.9661e-05 deg peri 162.6626195316587 2.8106e-05 deg M 187.2634914248411 2.1602e-05 deg tp 2460151.395505638281 (2023-Jul-25.89550564) 0.0001213 TDB period 1981.760456162249 5.43 1.229e-05 3.365e-08 d yr n .1816566673739939 1.1266e-09 deg/d Q 3.348381035779069 1.3843e-08 au   Orbit Determination Parameters    # obs. used (total)      3398      data-arc span      41779 days (114.38 yr)      first obs. used      1906-10-17      last obs. used      2021-03-06      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41042      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 12:25:27   Additional Information  Earth MOID = 1.82285 au   Jupiter MOID = 1.61496 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 10.42   n/a E2021B10   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-Apr-16 17:07 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin