+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   1566 Icarus (1949 MA) Classification: Apollo [NEO, PHA]          SPK-ID: 2001566 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 70 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .8269180171846691 6.6833e-08   a 1.077945820142032 3.6181e-10 AU q .1865729999176811 7.2046e-08 AU i 22.83037445902777 1.6182e-05 deg node 88.02911716001863 4.272e-06 deg peri 31.34755145239992 8.3593e-06 deg M 62.69922265923063 9.8107e-06 deg tp 2456329.304346315622 (2013-Feb-05.80434632) 1.1106e-05 JED period 408.7839408420903 1.12 2.0581e-07 5.635e-10 d yr n .8806608186672011 4.4338e-10 deg/d Q 1.969318640366384 6.6099e-10 AU   Orbit Determination Parameters    # obs. used (total)      781      # delay obs. used      0      # Doppler obs. used      11      data-arc span      23295 days (63.78 yr)      first obs. used      1949-06-27      last obs. used      2013-04-07      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      1.0146      data source      ORB      producer      Otto Matic      solution date      2013-May-02 01:50:32   Additional Information  Earth MOID = .0346317 AU   T_jup = 5.299  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.9 mag n/a PDS3 (MPC 28106)   diameter diameter 1.0 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   rotation period rot_per 2.273 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Miner, E.; Young, J. (1969) Icarus 10, 436-440.] [Gehrels, T.; Roemer, E.; Taylor, R.C.; Zellner, B.H. (1970) Astron. J. 75, 186-195.] [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.] geometric albedo albedo 0.51   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   B-V BV .774 mag .035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=13; phase (min.=38.56, mean=70.86, max.=102.48) deg. U-B UB .520 mag .067 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=9; phase (min.=38.56, mean=68.16, max.=100.85) deg. 1566 Icarus (1949 MA)          Discovered 1949-Jun-27 by Baade, W. at Palomar (675) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-24 14:18 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin