+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08454431663848337 3.8455e-08   a 3.087438036108901 1.302e-08 au q 2.826412697182413 1.1911e-07 au i 9.803119585711153 4.2654e-06 deg node 42.57857852759063 2.0783e-05 deg peri 162.7471196995304 2.9318e-05 deg M 150.829162582042 2.1861e-05 deg tp 2458170.307852504477 (2018-Feb-20.80785250) 0.00011871 TDB period 1981.507872761818 5.43 1.2534e-05 3.432e-08 d yr n .1816798232036461 1.1493e-09 deg/d Q 3.34846337503539 1.4121e-08 au   Orbit Determination Parameters    # obs. used (total)      3158      data-arc span      41669 days (114.08 yr)      first obs. used      1906-10-17      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4139      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:00:28   Additional Information  Earth MOID = 1.82314 au   Jupiter MOID = 1.61601 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 10.4   n/a MPO452179   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-Jan-27 23:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin