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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1451934908126153 4.7758e-08  
a 3.136163657750517 2.7165e-08 au
q 2.680813108522059 1.5153e-07 au
i 15.77104637340551 5.1763e-06 deg
node 227.3730484392499 2.0152e-05 deg
peri 201.9759139761205 2.9933e-05 deg
M 241.3751798730836 2.6418e-05 deg
tp 2459668.950988395773
(2022-Mar-30.45098840)
0.00015437 TDB
period 2028.600385357934
5.55
2.6357e-05
7.216e-08
d
yr
n .1774622555523572 2.3057e-09 deg/d
Q 3.591514206978975 3.1109e-08 au
  Orbit Determination Parameters
   # obs. used (total)      520  
   data-arc span      7601 days (20.81 yr)  
   first obs. used      1999-10-08  
   last obs. used      2020-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55087  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 08:20:19  

Additional Information
 Earth MOID = 1.70032 au 
 Jupiter MOID = 1.79233 au 
 T_jup = 3.138 
[ 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 14.7   n/a MPO445764  
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. 2019-August); 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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