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21993 (1999 XH26)
Classification: Main-belt Asteroid          SPK-ID: 2021993
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07274485198254525 3.5702e-08  
a 2.918691338083485 1.4876e-08 au
q 2.706371568711865 1.0242e-07 au
i 1.106110644344075 3.6592e-06 deg
node 324.1789831718777 0.00018934 deg
peri 14.30287387022886 0.00019113 deg
M 139.3020466209105 2.6835e-05 deg
tp 2458495.749038471087
(2019-Jan-12.24903847)
0.00013558 TDB
period 1821.296616271855
4.99
1.3924e-05
3.812e-08
d
yr
n .1976613785935156 1.5112e-09 deg/d
Q 3.131011107455105 1.5958e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1398  
   data-arc span      8736 days (23.92 yr)  
   first obs. used      1997-04-11  
   last obs. used      2021-03-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52853  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:57:12  

Additional Information
 Earth MOID = 1.69524 au 
 Jupiter MOID = 2.15187 au 
 T_jup = 3.276 
[ 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 14.5   n/a MPO333021  
rotation period rot_per 5.830 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

21993 (1999 XH26)          Discovered 1999-Dec-06 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XH26 = 1998 MQ42 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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