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91851 (1999 UA8)
Classification: Main-belt Asteroid          SPK-ID: 2091851
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1451169205566641 4.5884e-08  
a 3.130593443762029 2.5573e-08 au
q 2.676291363688402 1.4687e-07 au
i 15.77266885644663 4.6866e-06 deg
node 227.2322219856384 1.947e-05 deg
peri 202.8161560896315 2.925e-05 deg
M 311.0090074298411 2.6795e-05 deg
tp 2459671.829135823672
(2022-Apr-02.32913582)
0.00015279 TDB
period 2023.198218623077
5.54
2.4791e-05
6.787e-08
d
yr
n .1779360997287771 2.1803e-09 deg/d
Q 3.584895523835657 2.9284e-08 au
  Orbit Determination Parameters
   # obs. used (total)      550  
   data-arc span      7712 days (21.11 yr)  
   first obs. used      1999-10-08  
   last obs. used      2020-11-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5484  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 14:48:05  

Additional Information
 Earth MOID = 1.69604 au 
 Jupiter MOID = 1.80147 au 
 T_jup = 3.139 
[ 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 14.72   n/a E2021B10  
diameter diameter 6.056 km 0.363 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 204.244 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.]
geometric albedo albedo 0.070   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

91851 (1999 UA8)          Discovered 1999-Oct-29 by CSS at Catalina
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

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