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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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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2191295334087668 3.5395e-08  
a 3.156982772800265 1.6474e-08 au
q 2.465194610817028 1.1244e-07 au
i 7.799231404910884 4.52e-06 deg
node 313.7381624092253 2.5272e-05 deg
peri 54.58952379721261 2.682e-05 deg
M 318.6899299027801 8.1041e-06 deg
tp 2458835.604085465174
(2019-Dec-18.10408547)
4.5945e-05 TDB
period 2048.8338695208
5.61
1.6037e-05
4.391e-08
d
yr
n .1757097075343644 1.3753e-09 deg/d
Q 3.848770934783502 2.0083e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2044  
   data-arc span      32558 days (89.14 yr)  
   first obs. used      1930-10-17  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46512  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 21:52:07  

Additional Information
 Earth MOID = 1.47296 au 
 Jupiter MOID = 1.70303 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 12.1   n/a MPO416765  
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 4.121566 h n/a LCDB (Rev. 2019-January); 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] (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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