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173991 (2001 XR170)
Classification: Main-belt Asteroid          SPK-ID: 2173991
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1845805138029081 4.6751e-08  
a 3.147581073113239 2.2539e-08 au
q 2.566598941401689 1.5039e-07 au
i .2678061755952857 5.6552e-06 deg
node 131.3339862372187 0.001116 deg
peri 262.3163219512465 0.0011161 deg
M 75.09760905170258 1.5707e-05 deg
tp 2458175.011894348229
(2018-Feb-25.51189435)
8.7757e-05 TDB
period 2039.688346524857
5.58
2.1909e-05
5.998e-08
d
yr
n .1764975519977619 1.8958e-09 deg/d
Q 3.728563204824789 2.67e-08 au
  Orbit Determination Parameters
   # obs. used (total)      432  
   data-arc span      8555 days (23.42 yr)  
   first obs. used      1995-09-03  
   last obs. used      2019-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54404  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 10:50:03  

Additional Information
 Earth MOID = 1.57235 au 
 Jupiter MOID = 1.70607 au 
 T_jup = 3.182 
[ 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 15.6   n/a MPO254223  
rotation period rot_per 9.132 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:
[Masiero, J.; Jedicke, R.; Durecy, J.; Gwyn, S.; et al. (2009) Icarus 204, 145-171.]
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]

173991 (2001 XR170)          Discovered 2001-Dec-14 by LINEAR at Socorro
Reference: 20080122/Numbers.arcLast Updated: 2008-01-28

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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