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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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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.DBLast Updated: 2003-08-29

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