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91448 (1999 RY21)
Classification: Main-belt Asteroid          SPK-ID: 2091448
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1110523663803179 4.0776e-08  
a 2.57575244359001 1.4393e-08 au
q 2.289709039519453 1.046e-07 au
i 10.53090021937641 5.6664e-06 deg
node 8.598081033846782 2.6369e-05 deg
peri 109.3463259480235 3.7461e-05 deg
M 253.2508041932843 2.7114e-05 deg
tp 2459448.230539910927
(2021-Aug-21.73053991)
0.00011457 TDB
period 1509.922329155322
4.13
1.2656e-05
3.465e-08
d
yr
n .2384228599370343 1.9984e-09 deg/d
Q 2.861795847660567 1.5991e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1099  
   data-arc span      7311 days (20.02 yr)  
   first obs. used      1999-08-22  
   last obs. used      2019-08-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49592  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 22:30:16  

Additional Information
 Earth MOID = 1.33001 au 
 Jupiter MOID = 2.23046 au 
 T_jup = 3.395 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456417.5 (2013-May-05.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1101454333704174 4.059e-08  
q 2.293194974069591 1.0411e-07 au
tp 2456423.093232908879
(2013-May-10.59323291)
0.00011274 TDB
node 8.737691662247089 2.6326e-05 deg
peri 108.4599941112277 3.7693e-05 deg
i 10.53827643304445 5.6704e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1099  
   data-arc span      7311 days (20.02 yr)  
   first obs. used      1999-08-22  
   last obs. used      2019-08-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49592  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 22:30:16  

Additional Information
 Jupiter MOID = 2.23046 au 
 T_jup = 3.395 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.64754429595649E-15 -4.193609869871582E-15 -5.346218852908102E-13 5.429689452479848E-15 -1.349525018123726E-13 -1.059977869509582E-15
q -4.193609869871582E-15 1.083806958480267E-14 1.440921822430651E-12 -1.465408585737329E-14 3.614454899521424E-13 3.437159895312336E-15
tp -5.346218852908102E-13 1.440921822430651E-12 1.271027006894952E-8 -7.955637875842516E-12 3.063818883118927E-9 9.635070937136517E-12
node 5.429689452479848E-15 -1.465408585737329E-14 -7.955637875842516E-12 6.930442456392838E-10 -6.826176214038681E-10 2.803155787851165E-11
peri -1.349525018123726E-13 3.614454899521424E-13 3.063818883118927E-9 -6.826176214038681E-10 1.420790541237083E-9 -2.519728397848729E-11
i -1.059977869509582E-15 3.437159895312336E-15 9.635070937136517E-12 2.803155787851165E-11 -2.519728397848729E-11 3.215374934832889E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.3   n/a MPO493511  
diameter diameter 3.279 km 0.341 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.208   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91448 (1999 RY21)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

Alternate Designations
 1999 RY21 = 2000 WD145 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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