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JPL Small-Body Database Browser
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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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1110523462927878 4.1376e-08  
a 2.575752451688878 1.4852e-08 au
q 2.289709098459428 1.0647e-07 au
i 10.53089858401415 5.9132e-06 deg
node 8.598085215958305 2.7163e-05 deg
peri 109.3463388411864 3.8906e-05 deg
M 253.2507812127735 2.8215e-05 deg
tp 2459448.230638408126
(2021-Aug-21.73063841)
0.00011915 TDB
period 1509.922336276734
4.13
1.3059e-05
3.575e-08
d
yr
n .2384228588125346 2.0621e-09 deg/d
Q 2.861795804918329 1.6501e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1040  
   data-arc span      6870 days (18.81 yr)  
   first obs. used      1999-08-22  
   last obs. used      2018-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49906  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-04 03:23:11  

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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