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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2194148524782026 1.8354e-08  
a 3.158093944633791 1.3454e-08 au
q 2.465161227659663 6.0137e-08 au
i 7.799697817391904 2.6361e-07 deg
node 313.7344516075781 1.2675e-06 deg
peri 54.703748539 2.3603e-06 deg
M 64.00956396675649 3.5809e-06 deg
tp 2458836.016089178810
(2019-Dec-18.51608918)
1.8584e-05 TDB
period 2049.915665161768
5.61
1.31e-05
3.587e-08
d
yr
n .1756169807949591 1.1223e-09 deg/d
Q 3.851026661607919 1.6406e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2484  
   data-arc span      33027 days (90.42 yr)  
   first obs. used      1930-10-17  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43706  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:58:28  

Additional Information
 Earth MOID = 1.47232 au 
 Jupiter MOID = 1.70581 au 
 T_jup = 3.154 
[ 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 12.24   n/a E2021B10  
diameter diameter 11.484 km 0.258 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.121 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
[Marchini, A.; Bernardi, E.; Saya, L.F.; Papini, R.; et al. (2020) Minor Planet Bull. 47, 69-70.]
geometric albedo albedo 0.212   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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

[ show close-approach data ]
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 ]
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