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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 120 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .8270729145479981 3.1056e-08  
a 1.078076432371657 2.8762e-09 au
q .1864286153445228 3.3466e-08 au
i 22.81881894498625 1.0277e-05 deg
node 87.98911315982905 3.6602e-06 deg
peri 31.40697086798488 5.9314e-06 deg
M 8.160598764810214 6.8452e-06 deg
tp 2459191.231866527544
(2020-Dec-07.73186653)		 7.7386e-06 TDB
period 408.8582402154029
1.12		 1.6362e-06
4.48e-09		 d
yr
n .8805007814208112 3.5236e-09 deg/d
Q 1.969724249398791 5.2549e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.047565013120468E-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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .34334  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:37:29  

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.DBLast Updated: 2003-08-29

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