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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1110523667417959 4.0474e-08  
a 2.575752444278852 1.4258e-08 au
q 2.28970903920072 1.0402e-07 au
i 10.53090020830342 5.6659e-06 deg
node 8.598080261704185 2.6188e-05 deg
peri 109.3463272309971 3.7318e-05 deg
M 253.2508032831482 2.7112e-05 deg
tp 2459448.230543907853
(2021-Aug-21.73054391)
0.00011456 TDB
period 1509.922329761028
4.13
1.2538e-05
3.433e-08
d
yr
n .2384228598413909 1.9797e-09 deg/d
Q 2.861795849356985 1.5842e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1134  
   data-arc span      7653 days (20.95 yr)  
   first obs. used      1999-08-22  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49058  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 08:17:20  

Additional Information
 Earth MOID = 1.33001 au 
 Jupiter MOID = 2.23046 au 
 T_jup = 3.395 
[ show covariance matrix ]

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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