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338847 (2003 XZ21)
Classification: Mars-crossing Asteroid          SPK-ID: 2338847
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3238655380874059 7.1747e-08  
a 2.107194764576017 1.4006e-08 au
q 1.424746998291641 1.59e-07 au
i 5.099346044794138 3.1239e-06 deg
node 122.398714728994 3.8623e-05 deg
peri 193.3734343669904 3.9728e-05 deg
M 352.3946706425381 6.3178e-06 deg
tp 2459420.103204567569
(2021-Jul-24.60320457)
1.9472e-05 TDB
period 1117.26307237277
3.06
1.1139e-05
3.05e-08
d
yr
n .3222159658740494 3.2126e-09 deg/d
Q 2.789642530860394 1.8542e-08 au
  Orbit Determination Parameters
   # obs. used (total)      768  
   data-arc span      6447 days (17.65 yr)  
   first obs. used      2003-12-14  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44071  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 04:22:35  

Additional Information
 Earth MOID = .411039 au 
 Jupiter MOID = 2.52204 au 
 T_jup = 3.669 
[ 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 16.91   n/a MPO638826  
rotation period rot_per 22.6106 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]

338847 (2003 XZ21)          Discovered 2003-Dec-14 by NEAT at Palomar
Reference: 20121029/Numbers.arcLast Updated: 2012-11-08

[ show close-approach data ]
Alternate Designations
 2003 XZ21 = 2008 CH92 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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