+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1147222397690661 5.4437e-08   a 5.294003637539105 7.6602e-08 au q 4.686663682895036 3.3476e-07 au i 18.02582613050427 6.5879e-06 deg node 332.8779859593355 1.206e-05 deg peri 60.61500843812647 2.8133e-05 deg M 311.1547803540633 2.5094e-05 deg tp 2459604.162705799696 (2022-Jan-24.66270580) 0.00031252 TDB period 4449.126765385903 12.18 9.6565e-05 2.644e-07 d yr n .08091475450886029 1.7562e-09 deg/d Q 5.901343592183174 8.539e-08 au   Orbit Determination Parameters    # obs. used (total)      1863      data-arc span      30766 days (84.23 yr)      first obs. used      1936-08-17      last obs. used      2020-11-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47064      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:00:20   Additional Information  Earth MOID = 3.73393 au   Jupiter MOID = .0437748 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 9.3   n/a MPO263357   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-Jan-21 21:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin