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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 271 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1205277295581755 2.2867e-08  
a 1.269417887411422 1.6385e-09 au
q 1.116417831581187 2.9272e-08 au
i 23.9800237653183 4.5465e-06 deg
node 59.21459588687527 4.4508e-06 deg
peri 197.198198330778 1.1655e-05 deg
M 204.5319045016434 1.272e-05 deg
tp 2459426.102612785079
(2021-Jul-30.60261279)
1.8753e-05 TDB
period 522.4026212084593
1.43
1.0114e-06
2.769e-09
d
yr
n .689123647900583 1.3342e-09 deg/d
Q 1.422417943241656 1.8359e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1303  
   # delay obs. used      1  
   # Doppler obs. used      0  
   data-arc span      17005 days (46.56 yr)  
   first obs. used      1974-09-22  
   last obs. used      2021-04-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44335  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:34:21  

Additional Information
 Earth MOID = .107831 au 
 Jupiter MOID = 3.59778 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. 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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