+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 119 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .8270213517584103 3.1066e-08   a 1.078168924356222 2.7933e-09 au q .186500203111228 3.3477e-08 au i 22.82210584381254 1.0278e-05 deg node 87.9975459324354 3.6595e-06 deg peri 31.39333873322229 5.932e-06 deg M 192.0831791807477 6.1861e-06 deg tp 2459191.230586607055 (2020-Dec-07.73058661) 7.7365e-06 TDB period 408.9108574324997 1.12 1.5891e-06 4.351e-09 d yr n .8803874816638403 3.4213e-09 deg/d Q 1.969837645601215 5.1034e-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 = .0342447 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 16.9   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 2.2726 h n/a LCDB (Rev. 2019-August); 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 ] 2020-Dec-01 22:11 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin