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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 200 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1205317810421956 2.4091e-08  
a 1.269394691642141 2.0354e-09 au
q 1.116392288613006 3.0561e-08 au
i 23.98193942988599 9.5919e-06 deg
node 59.218268520422 6.0063e-06 deg
peri 197.199168252973 1.4367e-05 deg
M 151.0398048722666 1.2789e-05 deg
tp 2458381.329368604613
(2018-Sep-19.82936860)
1.8388e-05 TDB
period 522.388302666743
1.43
1.2564e-06
3.44e-09
d
yr
n .689142536619281 1.6575e-09 deg/d
Q 1.422397094671277 2.2808e-09 au
  Orbit Determination Parameters
   # obs. used (total)      919  
   # delay obs. used      1  
   # Doppler obs. used      0  
   data-arc span      15826 days (43.33 yr)  
   first obs. used      1974-09-22  
   last obs. used      2018-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44972  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Feb-06 10:24:30  

Additional Information
 Earth MOID = .109111 au 
 Jupiter MOID = 3.59916 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-January); 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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