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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .111284298019068 3.4815e-08  
a 2.576524621757479 1.1216e-08 au
q 2.289797887896353 9.3634e-08 au
i 10.5302330299869 5.421e-06 deg
node 8.593647741299483 2.1179e-05 deg
peri 109.2383968556868 3.3967e-05 deg
M 347.7717987074236 2.6622e-05 deg
tp 2459447.810937630697
(2021-Aug-21.31093763)
0.00011176 TDB
period 1510.601363608963
4.14
9.8638e-06
2.701e-08
d
yr
n .2383156858404573 1.5561e-09 deg/d
Q 2.863251355618605 1.2464e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1544  
   data-arc span      7905 days (21.64 yr)  
   first obs. used      1999-08-22  
   last obs. used      2021-04-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45256  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 23:40:37  

Additional Information
 Earth MOID = 1.33065 au 
 Jupiter MOID = 2.22845 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 14.33   n/a MPCxxxxx  
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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