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JPL Small-Body Database Browser
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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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01464748659826283 4.8016e-08  
a 3.116148579400345 2.8099e-08 au
q 3.070504834845383 1.5422e-07 au
i 7.928961365592245 6.1364e-06 deg
node 44.37683736439165 3.7459e-05 deg
peri 274.5997359045214 0.00021364 deg
M 331.7754642551915 0.00021178 deg
tp 2459158.025174176085
(2020-Nov-04.52517418)
0.0011824 TDB
period 2009.211531984954
5.50
2.7176e-05
7.44e-08
d
yr
n .1791747629700026 2.4235e-09 deg/d
Q 3.161792323955307 2.8511e-08 au
  Orbit Determination Parameters
   # obs. used (total)      577  
   data-arc span      8036 days (22.00 yr)  
   first obs. used      1997-05-08  
   last obs. used      2019-05-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58277  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 06:04:49  

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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