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21056 (1991 CA1)
Classification: Mars-crossing Asteroid          SPK-ID: 2021056
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1067051833475523 3.8762e-08  
a 1.850248360528658 5.391e-09 au
q 1.652817269979939 7.2436e-08 au
i 25.5591964229663 4.4095e-06 deg
node 123.9546772498787 9.4922e-06 deg
peri 305.3330650327467 2.7458e-05 deg
M 293.3715912113357 2.9643e-05 deg
tp 2459170.637642139375
(2020-Nov-17.13764214)
7.613e-05 TDB
period 919.2708078088705
2.52
4.0177e-06
1.1e-08
d
yr
n .3916147417517572 1.7116e-09 deg/d
Q 2.047679451077376 5.9663e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1470  
   data-arc span      10767 days (29.48 yr)  
   first obs. used      1991-02-08  
   last obs. used      2020-08-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44548  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:40:57  

Additional Information
 Earth MOID = .72155 au 
 Jupiter MOID = 3.14851 au 
 T_jup = 3.882 
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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 14.8   n/a MPO431743  
rotation period rot_per 5.60 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2006) Minor Planet Bull. 33, 58-62.]
[Warner, B.D. (2011) Minor Planet Bull. 38, 142-149.]
[Stephens, R.D. (2016) Minor Planet Bull. 43, 252-255.]

21056 (1991 CA1)          Discovered 1991-Feb-14 by Helin, E. F. at Palomar
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1991 CA1 = 1999 LZ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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