+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1566 Icarus (1949 MA) Classification: Apollo [NEO, PHA]          SPK-ID: 2001566 [ 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 119 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .8270729144647164 3.1056e-08   a 1.078076432375286 2.8762e-09 au q .1864286154349344 3.3466e-08 au i 22.81881891932611 1.0277e-05 deg node 87.9891132689737 3.6602e-06 deg peri 31.40697081110056 5.9314e-06 deg M 8.160598893187423 6.8452e-06 deg tp 2459191.231866381697 (2020-Dec-07.73186638) 7.7386e-06 TDB period 408.8582402174673 1.12 1.6362e-06 4.48e-09 d yr n .8805007814163655 3.5236e-09 deg/d Q 1.969724249315637 5.2549e-09 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] -3.052890990344277E-15 6.964E-16 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)      1052      # delay obs. used      10      # Doppler obs. used      13      data-arc span      26002 days (71.19 yr)      first obs. used      1949-07-01      last obs. used      2020-09-08      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .34334      source      ORB      producer      Otto Matic      solution date      2020-Sep-10 06:23:50   Additional Information  Earth MOID = .0337001 au   Jupiter MOID = 3.21481 au   T_jup = 5.298   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 16.34   n/a E2021B10   diameter diameter 1.0 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   rotation period rot_per 2.2726 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 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.] [Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D. (2015) Minor Planet Bull. 42, 256-266.] [Oey, J.; Williams, H.; Groom, R. (2017) Minor Planet Bull. 44, 200-204.] geometric albedo albedo 0.51   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   B-V BV 0.774   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=13; phase (min.=38.56, mean=70.86, max.=102.48) deg. U-B UB 0.520   0.067 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 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-Mar-08 16:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin