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150309 (1999 US2)
Classification: Main-belt Asteroid          SPK-ID: 2150309
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1424468271902593 4.8469e-08  
a 2.182712445820278 7.7271e-09 au
q 1.871791983244489 1.0729e-07 au
i 3.186478129522578 4.2886e-06 deg
node 286.4288341052546 9.7754e-05 deg
peri 32.7528623704869 9.9139e-05 deg
M 322.8114615112042 1.6478e-05 deg
tp 2459518.174571145119
(2021-Oct-30.67457115)
5.4083e-05 TDB
period 1177.858754127692
3.22
6.2547e-06
1.712e-08
d
yr
n .305639363581087 1.623e-09 deg/d
Q 2.493632908396067 8.8278e-09 au
  Orbit Determination Parameters
   # obs. used (total)      345  
   data-arc span      7919 days (21.68 yr)  
   first obs. used      1999-10-12  
   last obs. used      2021-06-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .60318  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 15:07:39  

Additional Information
 Earth MOID = .858861 au 
 Jupiter MOID = 2.77187 au 
 T_jup = 3.664 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456984.5 (2014-Nov-23.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1427521257379281 4.854e-08  
q 1.871137136864119 1.0745e-07 au
tp 2457161.908769868442
(2015-May-19.40876987)
5.1875e-05 TDB
node 286.5182666325429 9.7754e-05 deg
peri 32.6199438624786 9.9129e-05 deg
i 3.186396584378002 4.2899e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      345  
   data-arc span      7919 days (21.68 yr)  
   first obs. used      1999-10-12  
   last obs. used      2021-06-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .60318  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 15:07:39  

Additional Information
 Jupiter MOID = 2.77187 au 
 T_jup = 3.664 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.356110740790423E-15 -5.205869508043042E-15 6.858334947741551E-13 -1.048122781491179E-14 1.715733790655992E-13 -2.466819862825449E-15
q -5.205869508043042E-15 1.154524188927153E-14 -1.484554720347124E-12 2.236181513310507E-14 -3.712343759542031E-13 5.516643581728026E-15
tp 6.858334947741551E-13 -1.484554720347124E-12 2.690998805396531E-9 -2.075428973536096E-11 8.823894767053456E-10 -3.191210470543714E-12
node -1.048122781491179E-14 2.236181513310507E-14 -2.075428973536096E-11 9.555852279355642E-9 -9.546692739534344E-9 1.068334333066503E-10
peri 1.715733790655992E-13 -3.712343759542031E-13 8.823894767053456E-10 -9.546692739534344E-9 9.82654322535646E-9 -1.076387913077488E-10
i -2.466819862825449E-15 5.516643581728026E-15 -3.191210470543714E-12 1.068334333066503E-10 -1.076387913077488E-10 1.840334355654237E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.51   n/a E2021B55  

150309 (1999 US2)          Discovered 1999-Oct-19 by Pravec, P., Kusnirak, P. at Ondrejov
Reference: 20070303/Numbers.arcLast Updated: 2007-03-07

Alternate Designations
 1999 US2 = 2002 RD32 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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