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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1068686767455595 8.7111e-09  
a 1.850424701179814 3.4353e-09 au
q 1.65267226194743 1.5938e-08 au
i 25.55905988821511 6.4814e-07 deg
node 123.95428665324 1.5396e-06 deg
peri 305.3312448419404 6.1579e-06 deg
M 88.4388126991348 5.5418e-06 deg
tp 2459170.636551162247
(2020-Nov-17.13655116)
1.4001e-05 TDB
period 919.402229631998
2.52
2.5603e-06
7.01e-09
d
yr
n .3915587632891585 1.0904e-09 deg/d
Q 2.048177140412198 3.8024e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2188  
   data-arc span      11114 days (30.43 yr)  
   first obs. used      1991-02-08  
   last obs. used      2021-07-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41304  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:56:44  

Additional Information
 Earth MOID = .721788 au 
 Jupiter MOID = 3.14802 au 
 T_jup = 3.882 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457737.5 (2016-Dec-15.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1069703543393418 8.7169e-09  
q 1.65239331988539 1.5944e-08 au
tp 2457331.588618477266
(2015-Nov-05.08861848)
1.3758e-05 TDB
node 123.9751557638986 1.5401e-06 deg
peri 305.1955169905659 6.1462e-06 deg
i 25.55220889034829 6.4796e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2188  
   data-arc span      11114 days (30.43 yr)  
   first obs. used      1991-02-08  
   last obs. used      2021-07-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41304  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:56:44  

Additional Information
 Jupiter MOID = 3.14802 au 
 T_jup = 3.882 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.598510556992264E-17 -1.364533052115718E-16 1.599774666155633E-14 -5.137668295360733E-15 1.356911687971365E-14 1.704245236071662E-15
q -1.364533052115718E-16 2.54215592134558E-16 -3.58058109593645E-14 9.334331743460943E-15 -2.774727968858579E-14 -3.142747446606933E-15
tp 1.599774666155633E-14 -3.58058109593645E-14 1.892888412305033E-10 4.43606348937375E-12 8.235169116008375E-11 -2.261776782866407E-12
node -5.137668295360733E-15 9.334331743460943E-15 4.43606348937375E-12 2.371912989963972E-12 4.152994176718104E-14 2.315113643946494E-13
peri 1.356911687971365E-14 -2.774727968858579E-14 8.235169116008375E-11 4.152994176718104E-14 3.777565457608871E-11 -1.291141344852367E-12
i 1.704245236071662E-15 -3.142747446606933E-15 -2.261776782866407E-12 2.315113643946494E-13 -1.291141344852367E-12 4.198460097839153E-13

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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