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91609 (1999 TX21)
Classification: Main-belt Asteroid          SPK-ID: 2091609
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1265073500650823 3.602e-08  
a 2.746082393933813 1.4738e-08 au
q 2.398682787216869 9.4905e-08 au
i 7.200280836286273 5.438e-06 deg
node 22.42655215424363 2.8506e-05 deg
peri 96.53637595499875 3.6724e-05 deg
M 97.64900358440968 2.4243e-05 deg
tp 2458549.647909439197
(2019-Mar-07.14790944)
0.00011014 TDB
period 1662.144483241837
4.55
1.3381e-05
3.664e-08
d
yr
n .2165876695014251 1.7436e-09 deg/d
Q 3.093482000650758 1.6603e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1096  
   data-arc span      10363 days (28.37 yr)  
   first obs. used      1992-01-31  
   last obs. used      2020-06-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50665  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-24 00:40:21  

Additional Information
 Earth MOID = 1.42761 au 
 Jupiter MOID = 2.00939 au 
 T_jup = 3.325 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457246.5 (2015-Aug-12.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1276464325131617 3.6034e-08  
q 2.395244398874633 9.5111e-08 au
tp 2456887.964023934455
(2014-Aug-18.46402393)
0.00010337 TDB
node 22.4409526256399 2.8504e-05 deg
peri 96.64431039025277 3.6584e-05 deg
i 7.201461007897874 5.4386e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1096  
   data-arc span      10363 days (28.37 yr)  
   first obs. used      1992-01-31  
   last obs. used      2020-06-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50665  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-24 00:40:21  

Additional Information
 Jupiter MOID = 2.00939 au 
 T_jup = 3.325 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.298452014547626E-15 -3.400070619724912E-15 7.366082552156244E-13 6.426857571167547E-16 1.272229160462137E-13 -1.251105388930652E-15
q -3.400070619724912E-15 9.046115486412379E-15 -1.531790849331938E-12 -8.253263143487833E-16 -2.378606873042127E-13 3.712868070975058E-15
tp 7.366082552156244E-13 -1.531790849331938E-12 1.068568561511446E-8 5.006004446115685E-12 2.376915798253431E-9 -1.952484878996834E-12
node 6.426857571167547E-16 -8.253263143487833E-16 5.006004446115685E-12 8.124772429735542E-10 -8.045162533273658E-10 1.462988921549783E-12
peri 1.272229160462137E-13 -2.378606873042127E-13 2.376915798253431E-9 -8.045162533273658E-10 1.338368141578488E-9 -1.764802465295091E-12
i -1.251105388930652E-15 3.712868070975058E-15 -1.952484878996834E-12 1.462988921549783E-12 -1.764802465295091E-12 2.957824568034324E-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 14.7   n/a MPO325094  
diameter diameter 4.819 km 0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.117   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91609 (1999 TX21)          Discovered 1999-Oct-03 by Spacewatch at Kitt Peak
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1999 TX21 = 2000 WQ153 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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