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91442 (1999 RD17)
Classification: Main-belt Asteroid          SPK-ID: 2091442
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2230090991681263 4.4436e-08  
a 2.808062657011761 1.7282e-08 au
q 2.181839133463913 1.2321e-07 au
i 6.91788646521805 5.0671e-06 deg
node 203.0390185338795 3.779e-05 deg
peri 104.20181946 3.9533e-05 deg
M 173.7237066967761 1.203e-05 deg
tp 2458171.097759036313
(2018-Feb-21.59775904)
5.3963e-05 TDB
period 1718.733801070044
4.71
1.5867e-05
4.344e-08
d
yr
n .2094565195470482 1.9336e-09 deg/d
Q 3.43428618055961 2.1136e-08 au
  Orbit Determination Parameters
   # obs. used (total)      614  
   data-arc span      7461 days (20.43 yr)  
   first obs. used      1999-08-22  
   last obs. used      2020-01-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54438  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 22:30:15  

Additional Information
 Earth MOID = 1.17998 au 
 Jupiter MOID = 1.90651 au 
 T_jup = 3.275 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456792.5 (2014-May-15.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2262313907279999 4.4835e-08  
q 2.169697002590641 1.2472e-07 au
tp 2456451.286925312267
(2013-Jun-07.78692531)
4.8235e-05 TDB
node 203.2213229378928 3.7956e-05 deg
peri 103.62645964506 3.9599e-05 deg
i 6.905714489921501 5.0635e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      614  
   data-arc span      7461 days (20.43 yr)  
   first obs. used      1999-08-22  
   last obs. used      2020-01-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54438  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 22:30:15  

Additional Information
 Jupiter MOID = 1.90651 au 
 T_jup = 3.275 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.010172911810963E-15 -5.561145640296013E-15 7.891445523237359E-13 -2.609806792668979E-14 1.604157222891758E-13 -5.891407605464665E-15
q -5.561145640296013E-15 1.555438629046634E-14 -2.149150933160172E-12 7.327330022377868E-14 -4.305953809429879E-13 1.687360318553198E-14
tp 7.891445523237359E-13 -2.149150933160172E-12 2.326607568859353E-9 -1.253630596243688E-11 5.665931955179293E-10 -5.87938179691955E-12
node -2.609806792668979E-14 7.327330022377868E-14 -1.253630596243688E-11 1.440647795650084E-9 -1.431953832166565E-9 -5.764830668947336E-11
peri 1.604157222891758E-13 -4.305953809429879E-13 5.665931955179293E-10 -1.431953832166565E-9 1.568043909212146E-9 5.595928445176403E-11
i -5.891407605464665E-15 1.687360318553198E-14 -5.87938179691955E-12 -5.764830668947336E-11 5.595928445176403E-11 2.5639224782132E-11

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 15.4   n/a MPO412707  
diameter diameter 3.988 km 0.892 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.084   0.093 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91442 (1999 RD17)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

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