+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1404 Ajax (1936 QW) Classification: Jupiter Trojan          SPK-ID: 2001404 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1146447518053788 3.9881e-08   a 5.291168380842654 7.1788e-08 au q 4.68456369506048 2.5524e-07 au i 18.02954660034046 1.9624e-06 deg node 332.8800812889296 7.5749e-06 deg peri 60.93802546402937 1.2104e-05 deg M 327.0615926763036 1.376e-05 deg tp 2459607.248439459049 (2022-Jan-27.74843946) 0.00017257 TDB period 4445.553082340878 12.17 9.0472e-05 2.477e-07 d yr n .08097980011306853 1.648e-09 deg/d Q 5.897773066624828 8.0018e-08 au   Orbit Determination Parameters    # obs. used (total)      2064      data-arc span      30855 days (84.48 yr)      first obs. used      1936-08-17      last obs. used      2021-02-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .45152      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 12:24:15   Additional Information  Earth MOID = 3.73109 au   Jupiter MOID = .0428397 au   T_jup = 2.889  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 9.41   n/a E2021B10   diameter diameter 83.990 km 1.279 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 29.38 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Binzel, R.P.; Sauter, L.M. (1992) Icarus 95, 222-238.] [French, L.M.; Stephens, R.D.; Lederer, S.M.; Coley, D.R.; Rohl, D.A. (2011) Minor Planet Bull. 38, 116-120.] geometric albedo albedo 0.048   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   1404 Ajax (1936 QW)          Discovered 1936-Aug-17 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jun-21 22:51 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin