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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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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 181 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3334009856404969 1.891e-08  
a 1.034411033419044 1.5443e-09 au
q .6895373753197295 1.8767e-08 au
i 7.898893736516076 3.0853e-06 deg
node 353.7240095641626 8.6636e-06 deg
peri 271.8053033608434 8.2924e-06 deg
M 243.3070671812646 1.2212e-05 deg
tp 2459325.060458300935
(2021-Apr-20.56045830)
1.3299e-05 TDB
period 384.2714713322987
1.05
8.6055e-07
2.356e-09
d
yr
n .9368376964125189 2.098e-09 deg/d
Q 1.379284691518358 2.0592e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1185  
   # delay obs. used      1  
   # Doppler obs. used      1  
   data-arc span      7320 days (20.04 yr)  
   first obs. used      2001-02-02  
   last obs. used      2021-02-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40804  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 18:28:42  

Additional Information
 Earth MOID = .023946 au 
 Jupiter MOID = 3.71608 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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