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91861 (1999 UT18)
Classification: Main-belt Asteroid          SPK-ID: 2091861
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01464747977389586 4.4782e-08  
a 3.116148572331685 2.5405e-08 au
q 3.070504849146002 1.477e-07 au
i 7.928959458348899 5.5253e-06 deg
node 44.37683844384147 3.4628e-05 deg
peri 274.5997340156601 0.0001889 deg
M 331.7754710491618 0.00018551 deg
tp 2459158.025135721971
(2020-Nov-04.52513572)
0.0010354 TDB
period 2009.211525148422
5.50
2.4571e-05
6.727e-08
d
yr
n .1791747635796617 2.1912e-09 deg/d
Q 3.161792295517367 2.5778e-08 au
  Orbit Determination Parameters
   # obs. used (total)      625  
   data-arc span      8439 days (23.10 yr)  
   first obs. used      1997-05-08  
   last obs. used      2020-06-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56767  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-24 00:41:47  

Additional Information
 Earth MOID = 2.07081 au 
 Jupiter MOID = 1.86471 au 
 T_jup = 3.203 
[ 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 14.6   n/a MPO436414  
diameter diameter 7.693 km 0.144 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.043   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91861 (1999 UT18)          Discovered 1999-Oct-30 by Spacewatch at Kitt Peak
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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