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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1068686767050671 8.7115e-09  
a 1.850424701181036 3.436e-09 au
q 1.65267226202345 1.5939e-08 au
i 25.55905988749576 6.4814e-07 deg
node 123.9542866551532 1.5396e-06 deg
peri 305.3312448243222 6.1584e-06 deg
M 88.4388127038663 5.5418e-06 deg
tp 2459170.636551149939
(2020-Nov-17.13655115)
1.4001e-05 TDB
period 919.402229632909
2.52
2.5608e-06
7.011e-09
d
yr
n .3915587632887705 1.0906e-09 deg/d
Q 2.048177140338623 3.8032e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2174  
   data-arc span      11083 days (30.34 yr)  
   first obs. used      1991-02-08  
   last obs. used      2021-06-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41417  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:04:53  

Additional Information
 Earth MOID = .721788 au 
 Jupiter MOID = 3.14802 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 14.87   n/a MPCxxxxx  
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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