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JPL Small-Body Database Browser
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12215 (1981 US22)
Classification: Main-belt Asteroid          SPK-ID: 2012215
[ 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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1532098403700961 3.466e-08  
a 2.300968849676587 7.2038e-09 au
q 1.948437779521073 8.1441e-08 au
i 6.535498207952084 3.8761e-06 deg
node 76.21263216977907 3.2226e-05 deg
peri 288.633173677376 3.4554e-05 deg
M 295.0804013062785 1.2569e-05 deg
tp 2458830.399412546670
(2019-Dec-12.89941255)		 4.463e-05 TDB
period 1274.865990889214
3.49		 5.987e-06
1.639e-08		 d
yr
n .2823826210540775 1.3261e-09 deg/d
Q 2.6534999198321 8.3075e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1705  
   data-arc span      13916 days (38.10 yr)  
   first obs. used      1981-10-24  
   last obs. used      2019-11-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50054  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 23:23:16  

Additional Information
 Earth MOID = .957938 au 
 Jupiter MOID = 2.82014 au 
 T_jup = 3.567 
[ 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 14.5   n/a MPO347621  
diameter diameter 3.139 km 0.118 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.341   0.064 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

12215 (1981 US22)          Discovered 1981-Oct-24 by Bus, S. J. at Palomar
Reference: 19991123/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 US22 = 1981 WB6 = 1988 VP7 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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