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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 126 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .8270025770484959 2.7843e-08  
a 1.078113048682535 2.8486e-09 au
q .1865107790724681 3.0025e-08 au
i 22.81198494640687 8.8353e-06 deg
node 87.98055047960553 3.4722e-06 deg
peri 31.41889965374378 5.3847e-06 deg
M 180.7299314535884 7.3441e-06 deg
tp 2459600.110497151425
(2022-Jan-20.61049715)
9.1277e-06 TDB
period 408.8790703816576
1.12
1.6205e-06
4.437e-09
d
yr
n .8804559246917855 3.4895e-09 deg/d
Q 1.969715318292603 5.2044e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.050593663835279E-15 6.923E-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)      1078  
   # delay obs. used      10  
   # Doppler obs. used      13  
   data-arc span      26339 days (72.11 yr)  
   first obs. used      1949-07-01  
   last obs. used      2021-08-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .34741  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-12 06:00:59  

Additional Information
 Earth MOID = .0340552 au 
 Jupiter MOID = 3.21503 au 
 T_jup = 5.298 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455778.5 (2011-Aug-05.0) TDB
Reference: JPL 126 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .8268376356225552 2.7871e-08  
q .1866515121792161 3.0044e-08 au
tp 2455920.524388305835
(2011-Dec-25.02438831)
4.1409e-06 TDB
node 88.02814198304424 3.4686e-06 deg
peri 31.35043680238967 5.3836e-06 deg
i 22.82833282993349 8.841e-06 deg

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.050593663835279E-15 6.923E-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)      1078  
   # delay obs. used      10  
   # Doppler obs. used      13  
   data-arc span      26339 days (72.11 yr)  
   first obs. used      1949-07-01  
   last obs. used      2021-08-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .34741  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-12 06:00:59  

Additional Information
 Jupiter MOID = 3.21503 au 
 T_jup = 5.298 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
Orbit Covariance (7×7)
  e q tp node peri i A2
e 7.767738446213125E-16 -8.372941034184509E-16 4.760920988041347E-14 4.899808183995391E-14 -1.280078704402422E-13 -1.196011828656776E-13 -2.208139969047034E-25
q -8.372941034184509E-16 9.026439230076678E-16 -5.255496388740722E-14 -5.280319307133463E-14 1.379973561154226E-13 1.288691123601429E-13 4.717055934165279E-25
tp 4.760920988041347E-14 -5.255496388740722E-14 1.714668202391803E-11 6.806054991729212E-13 -5.917883223703233E-12 -1.072959525855796E-11 -2.55122762591191E-21
node 4.899808183995391E-14 -5.280319307133463E-14 6.806054991729212E-13 1.203108689880423E-11 -1.646467450621935E-11 -8.738884470599438E-12 3.416389855232977E-23
peri -1.280078704402422E-13 1.379973561154226E-13 -5.917883223703233E-12 -1.646467450621935E-11 2.898363458426829E-11 2.022396473871281E-11 4.754090118754258E-23
i -1.196011828656776E-13 1.288691123601429E-13 -1.072959525855796E-11 -8.738884470599438E-12 2.022396473871281E-11 7.816282829880499E-11 -2.774249750687881E-23
A2 -2.208139969047034E-25 4.717055934165279E-25 -2.55122762591191E-21 3.416389855232977E-23 4.754090118754258E-23 -2.774249750687881E-23 4.793147790185389E-31

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 16.35   n/a MPO636085  
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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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