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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 201 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1205852926388441 2.4079e-08  
a 1.269393185891397 2.0411e-09 au
q 1.116323037096928 3.0553e-08 au
i 23.98065997470429 9.5795e-06 deg
node 59.21489410859957 6.0069e-06 deg
peri 197.2058056955663 1.4358e-05 deg
M 66.690638912586 1.3022e-05 deg
tp 2458903.726812006783
(2020-Feb-24.22681201)
1.8807e-05 TDB
period 522.3873731847456
1.43
1.26e-06
3.45e-09
d
yr
n .6891437628081484 1.6622e-09 deg/d
Q 1.422463334685866 2.2873e-09 au
  Orbit Determination Parameters
   # obs. used (total)      923  
   # delay obs. used      1  
   # Doppler obs. used      0  
   data-arc span      16772 days (45.92 yr)  
   first obs. used      1974-09-22  
   last obs. used      2020-08-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45036  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 07:20:46  

Additional Information
 Earth MOID = .109127 au 
 Jupiter MOID = 3.59887 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 17.4   n/a MPO302195  
rotation period rot_per 3.405 h n/a LCDB (Rev. 2019-August); 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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