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22156 Richoffman (2000 WQ94)
Classification: Main-belt Asteroid          SPK-ID: 2022156
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1927025038398303 3.6888e-08  
a 2.303244000504957 7.6816e-09 au
q 1.859403114653584 8.7016e-08 au
i 2.62521154723143 3.6468e-06 deg
node 276.5913047665616 8.5214e-05 deg
peri 95.17859772551272 8.5818e-05 deg
M 309.5218836727299 1.1277e-05 deg
tp 2459379.523065344197
(2021-Jun-14.02306534)
4.0412e-05 TDB
period 1276.757300253961
3.50
6.3872e-06
1.749e-08
d
yr
n .2819643168896643 1.4106e-09 deg/d
Q 2.747084886356329 9.1619e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1808  
   data-arc span      12316 days (33.72 yr)  
   first obs. used      1986-11-29  
   last obs. used      2020-08-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52028  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 04:01:41  

Additional Information
 Earth MOID = .860255 au 
 Jupiter MOID = 2.72987 au 
 T_jup = 3.563 
[ 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 14.78   n/a E2021B10  
diameter diameter 6.351 km 0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.067   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

22156 Richoffman           Discovered 2000 Nov. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Richard Hoffman mentored a finalist in the 2005 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition. He teaches at the Kastner Intermediate School, Fresno, California.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20051019/MPCPages.arcLast Updated: 2005-10-26

[ show close-approach data ]
Alternate Designations
 2000 WQ94 = 1986 WQ1 = 1999 LT34 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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