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102581 (1999 US44)
Classification: Main-belt Asteroid          SPK-ID: 2102581
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1304055694841403 3.4912e-08  
a 2.342888177753046 1.0829e-08 au
q 2.0373625106955 8.316e-08 au
i 6.085607132316302 4.3371e-06 deg
node 244.3079661969325 3.897e-05 deg
peri 66.51570794437423 4.278e-05 deg
M 25.31427059618797 1.7471e-05 deg
tp 2459108.393838058691
(2020-Sep-15.89383806)		 6.3483e-05 TDB
period 1309.862678953283
3.59		 9.0815e-06
2.486e-08		 d
yr
n .274837970257827 1.9055e-09 deg/d
Q 2.648413844810592 1.2241e-08 au
   Orbit Determination Parameters
   # obs. used (total)      800  
   data-arc span      8264 days (22.63 yr)  
   first obs. used      1998-04-20  
   last obs. used      2020-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48788  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 08:31:50  

Additional Information
 Earth MOID = 1.03005 au 
 Jupiter MOID = 2.58237 au 
 T_jup = 3.544 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.66   n/a E2021B55  

102581 (1999 US44)          Discovered 1999-Oct-30 by CSS at Catalina
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

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Alternate Designations
 1999 US44 = 1998 HP45 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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