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JPL Small-Body Database Browser
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4961 Timherder (1958 TH1)
Classification: Main-belt Asteroid          SPK-ID: 2004961
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.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2192445974456291 3.5303e-08  
a 3.157184516159107 1.6222e-08 au
q 2.46498886785223 1.1215e-07 au
i 7.799617602757396 4.4252e-06 deg
node 313.7356963402578 2.5234e-05 deg
peri 54.65778659121175 2.676e-05 deg
M 28.92978923668337 7.8651e-06 deg
tp 2458835.838850798738
4.4888e-05 TDB
period 2049.030265221872
n .175692866089032 1.3541e-09 deg/d
Q 3.849380164465984 1.9778e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2144  
   data-arc span      32615 days (89.30 yr)  
   first obs. used      1930-10-17  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45646  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:26:14  

Additional Information
 Earth MOID = 1.47364 au 
 Jupiter MOID = 1.70624 au 
 T_jup = 3.154 
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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 12.2   n/a MPO502201  
diameter diameter 11.484 km 0.258 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 4.121566 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.212   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

4961 Timherder           Discovered 1958 Oct. 8 at the Lowell Observatory.
Timothy Scott Herder (b. 1955) is the deputy project manager of NASA's New Horizons-Pluto Kuiper Belt mission. As such, he has helped further the exploration of the planets.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20051215/MPCPages.arcLast Updated: 2006-03-22

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Alternate Designations
 1958 TH1 = 1930 UU = 1969 TQ3 = 1980 RY2 = 1982 BM3 = 1988 BE2 = 1991 QA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Feb-28 10:25 UT
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