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138971 (2001 CB21)
Classification: Apollo [NEO, PHA]          SPK-ID: 2138971
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 175 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3334579454766005 2.9315e-08  
a 1.034366115816757 2.7019e-09 au
q .6894485159658902 2.8684e-08 au
i 7.898927831124632 3.1325e-06 deg
node 353.7266290153026 8.8153e-06 deg
peri 271.7987410901699 8.4314e-06 deg
M 55.93680209191985 2.0684e-05 deg
tp 2458940.795785598880
(2020-Apr-01.29578560)
2.1848e-05 TDB
period 384.2464420665875
1.05
1.5055e-06
4.122e-09
d
yr
n .9368987206851332 3.6709e-09 deg/d
Q 1.379283715667625 3.6029e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1158  
   # delay obs. used      1  
   # Doppler obs. used      1  
   data-arc span      7289 days (19.96 yr)  
   first obs. used      2001-02-02  
   last obs. used      2021-01-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40661  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jan-18 06:08:00  

Additional Information
 Earth MOID = .0239178 au 
 Jupiter MOID = 3.71708 au 
 T_jup = 5.863 
[ 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 18.4   n/a MPO214609  
rotation period rot_per 3.3020 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Galad, A.; Pravec, P.; Kusnirak, P.; Gajdos, S.; et al. (2005) Earth, Moon, and Planets 97, 147-163.]

138971 (2001 CB21)          Discovered 2001-Feb-02 by LINEAR at Socorro
Reference: 20061205/Numbers.arcLast Updated: 2006-12-13

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