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157194 Saddlemyer (2004 QR16)
Classification: Main-belt Asteroid          SPK-ID: 2157194
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04080967210492408 4.9097e-08  
a 2.607889586127436 1.9372e-08 au
q 2.50146246723173 1.1988e-07 au
i 5.131308168327607 4.397e-06 deg
node 93.79763738046323 5.6229e-05 deg
peri 81.04652433715363 8.1441e-05 deg
M 108.5686951914605 5.8727e-05 deg
tp 2458736.589347938717
(2019-Sep-10.08934794)
0.00024979 TDB
period 1538.26878408683
4.21
1.714e-05
4.693e-08
d
yr
n .2340293216141082 2.6077e-09 deg/d
Q 2.714316705023143 2.0163e-08 au
  Orbit Determination Parameters
   # obs. used (total)      446  
   data-arc span      9642 days (26.40 yr)  
   first obs. used      1994-02-13  
   last obs. used      2020-07-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60949  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 12:55:26  

Additional Information
 Earth MOID = 1.5114 au 
 Jupiter MOID = 2.25635 au 
 T_jup = 3.404 
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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 16.41   n/a E2021B55  

157194 Saddlemyer           Discovered 2004 Aug. 21 by D. D. Balam at Mauna Kea.
Leslie K. Saddlemyer (b. 1959) is a systems engineer at the Herzberg Institute of Astrophysics, National Research Council of Canada. Currently the project manager for the Gemini Planetary Imager, he has been responsible for care and maintenance of the 1.82-m Plaskett Telescope at the Dominion Astrophysical Observatory.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070730/MPCPages.arcLast Updated: 2007-08-07

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