+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2101 Adonis (1936 CA) Classification: Apollo [NEO, PHA]          SPK-ID: 2002101 [ 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 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .7639569352283845 7.2613e-08   a 1.874240000609561 9.0149e-09 au q .4424013538614354 1.3627e-07 au i 1.322075868227243 9.8922e-06 deg node 349.498676640785 0.00048176 deg peri 43.60366892933326 0.00048203 deg M 52.96872421676497 1.0414e-05 deg tp 2459062.603500214801 (2020-Aug-01.10350021) 2.6958e-05 TDB period 937.2085255351394 2.57 6.7618e-06 1.851e-08 d yr n .3841194250707894 2.7714e-09 deg/d Q 3.306078647357687 1.5902e-08 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] -3.250572977799101E-14 5.715E-15 ALN [SET] 1. n/a NK [SET] 0. n/a NM [SET] 2. n/a R0 [SET] 1. n/a   Orbit Determination Parameters    # obs. used (total)      115      # delay obs. used      0      # Doppler obs. used      5      data-arc span      30790 days (84.30 yr)      first obs. used      1936-02-21      last obs. used      2020-06-09      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .39197      source      ORB      producer      Otto Matic      solution date      2021-Jan-28 10:24:33   Additional Information  Earth MOID = .0115597 au   Jupiter MOID = 2.14546 au   T_jup = 3.551   Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2  [ 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 18.64   n/a E2021B10   diameter diameter 0.6 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15) 2101 Adonis (1936 CA)          Discovered 1936-Feb-12 by Delporte, E. at Uccle Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-10 15:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin