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155400 (1995 UD1)
Classification: Main-belt Asteroid          SPK-ID: 2155400
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1429650601120941 6.4624e-08  
a 2.244462594738099 9.9886e-09 au
q 1.92358286496202 1.4331e-07 au
i 8.505154011614376 6.7627e-06 deg
node 5.630480156496219 3.2368e-05 deg
peri 13.13503392077542 4.0379e-05 deg
M 178.7169651444415 2.362e-05 deg
tp 2458590.780246927544
(2019-Apr-17.28024693)
7.8966e-05 TDB
period 1228.194038146753
3.36
8.1988e-06
2.245e-08
d
yr
n .2931132938433828 1.9567e-09 deg/d
Q 2.565342324514178 1.1417e-08 au
  Orbit Determination Parameters
   # obs. used (total)      284  
   data-arc span      8884 days (24.32 yr)  
   first obs. used      1995-10-21  
   last obs. used      2020-02-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56942  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 19:40:03  

Additional Information
 Earth MOID = .92461 au 
 Jupiter MOID = 2.90475 au 
 T_jup = 3.604 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456995.5 (2014-Dec-04.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1430821595839809 6.5046e-08  
q 1.923474955847511 1.4448e-07 au
tp 2457360.513332414035
(2015-Dec-04.01333241)
7.5841e-05 TDB
node 5.678997080379662 3.2333e-05 deg
peri 12.71813077695925 4.0303e-05 deg
i 8.510928940277141 6.7663e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      284  
   data-arc span      8884 days (24.32 yr)  
   first obs. used      1995-10-21  
   last obs. used      2020-02-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56942  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 19:40:03  

Additional Information
 Jupiter MOID = 2.90475 au 
 T_jup = 3.604 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.230936926716307E-15 -9.38183367016055E-15 -2.304162754920135E-12 -3.47997089540157E-14 -8.061081641582268E-13 3.876661807447387E-15
q -9.38183367016055E-15 2.087358802427914E-14 5.372757751060867E-12 7.875680941268074E-14 1.85956452468594E-12 -9.664020003615744E-15
tp -2.304162754920135E-12 5.372757751060867E-12 5.751833418375736E-9 3.443036229797193E-11 1.836075528754981E-9 -1.672612963946467E-11
node -3.47997089540157E-14 7.875680941268074E-14 3.443036229797193E-11 1.045445641182825E-9 -1.021210693486283E-9 -5.854254833380358E-11
peri -8.061081641582268E-13 1.85956452468594E-12 1.836075528754981E-9 -1.021210693486283E-9 1.624332876133651E-9 5.274835513415373E-11
i 3.876661807447387E-15 -9.664020003615744E-15 -1.672612963946467E-11 -5.854254833380358E-11 5.274835513415373E-11 4.57833411542754E-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 17.30   n/a E2021B55  

155400 (1995 UD1)          Discovered 1995-Oct-21 by Klet at Klet
Reference: 20070502/Numbers.arcLast Updated: 2007-05-02
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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