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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 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 
[ 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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