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JPL Small-Body Database Browser
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47451 (1999 XR221)
Classification: Main-belt Asteroid          SPK-ID: 2047451
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .117539442427547 4.0163e-08  
a 2.210169450897373 8.1233e-09 au
q 1.950387365968498 8.9875e-08 au
i 6.536705760402511 3.8884e-06 deg
node 49.14923087644477 4.0849e-05 deg
peri 338.2281782827338 4.5378e-05 deg
M 1.939297720879267 2.019e-05 deg
tp 2458594.034847539511
(2019-Apr-20.53484754)
6.7294e-05 TDB
period 1200.153468298272
3.29
6.6166e-06
1.812e-08
d
yr
n .2999616378315793 1.6537e-09 deg/d
Q 2.469951535826247 9.0781e-09 au
  Orbit Determination Parameters
   # obs. used (total)      807  
   data-arc span      9428 days (25.81 yr)  
   first obs. used      1994-02-13  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52656  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 04:03:31  

Additional Information
 Earth MOID = .956415 au 
 Jupiter MOID = 2.95082 au 
 T_jup = 3.640 
[ 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 15.7   n/a MPO347852  
diameter diameter 1.891 km 0.396 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.197   0.200 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

47451 (1999 XR221)          Discovered 1999-Dec-15 by LINEAR at Socorro
Reference: 20020921/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XR221 = 2001 HR32 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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