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21374 (1997 WS22)
Classification: Amor [NEO]          SPK-ID: 2021374
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 284 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1205178728937508 2.2628e-08  
a 1.269403223595435 1.6284e-09 au
q 1.116417447243242 2.8972e-08 au
i 23.97969465563321 4.4446e-06 deg
node 59.21085870797861 4.4148e-06 deg
peri 197.2121070151839 1.1647e-05 deg
M 339.589890605384 1.2885e-05 deg
tp 2459426.116971937454
(2021-Jul-30.61697194)
1.8735e-05 TDB
period 522.3935693502865
1.43
1.0052e-06
2.752e-09
d
yr
n .6891355888008742 1.3261e-09 deg/d
Q 1.422388999947627 1.8247e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1352  
   # delay obs. used      1  
   # Doppler obs. used      0  
   data-arc span      17084 days (46.77 yr)  
   first obs. used      1974-09-22  
   last obs. used      2021-07-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44707  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-03 06:40:38  

Additional Information
 Earth MOID = .109569 au 
 Jupiter MOID = 3.59663 au 
 T_jup = 4.995 
[ 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 17.45   n/a MPO614063  
rotation period rot_per 3.405 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:
[Warner, Brian D. (2014) Minor Planet Bull. 41, 213-224.]

21374 (1997 WS22)          Discovered 1997-Nov-24 by Hartley, M. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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