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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1067971399224063 8.7179e-09  
a 1.850381202584188 3.4378e-09 au
q 1.652765782382014 1.5959e-08 au
i 25.55925769937098 6.4816e-07 deg
node 123.9546616280971 1.5401e-06 deg
peri 305.3464994182693 6.1653e-06 deg
M 11.6844643045069 5.4936e-06 deg
tp 2459170.660156288025
(2020-Nov-17.16015629)
1.4011e-05 TDB
period 919.3698107466898
2.52
2.5621e-06
7.015e-09
d
yr
n .3915725704628225 1.0912e-09 deg/d
Q 2.047996622786362 3.8049e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2075  
   data-arc span      10982 days (30.07 yr)  
   first obs. used      1991-02-08  
   last obs. used      2021-03-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41329  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 02:52:12  

Additional Information
 Earth MOID = .721387 au 
 Jupiter MOID = 3.14799 au 
 T_jup = 3.882 
[ 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 14.86   n/a E2021B10  
rotation period rot_per 5.60 h n/a LCDB (Rev. 2020-October); 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

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