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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2192445948091492 3.5354e-08  
a 3.157184518385514 1.6267e-08 au
q 2.464988877914363 1.1236e-07 au
i 7.799617378470311 4.4666e-06 deg
node 313.7356963914697 2.5235e-05 deg
peri 54.65778741721114 2.6775e-05 deg
M 28.92978765573473 7.944e-06 deg
tp 2458835.838859622928
(2019-Dec-18.33885962)
4.5325e-05 TDB
period 2049.030267389298
5.61
1.5836e-05
4.336e-08
d
yr
n .1756928659031873 1.3578e-09 deg/d
Q 3.849380158856665 1.9833e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2112  
   data-arc span      32589 days (89.22 yr)  
   first obs. used      1930-10-17  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45672  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 19:47:20  

Additional Information
 Earth MOID = 1.47364 au 
 Jupiter MOID = 1.70624 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 12.2   n/a MPO502201  
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-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] (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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1922-Aug-25 20:49 00:02 Jupiter 1.80731110447039 1.80731030347035 1.80731190548604 1.29428472614636 0.858978460637404 2423292.367486343 2.19399460582321 389.264770490884 223.445305247196 89.9636591903034 2192406.60903206 T 31 CATAB v2.0f-lin.ifort 2020-Jan-28 19:47:50 2020-Jan-28 19:47
1933-Jan-28 13:04 00:02 Jupiter 1.675096219361 1.67509577886253 1.67509665986241 2.1357495008309 1.88417458224524 2427101.044209428 1.68310734351309 488.258536912356 32.9255929518905 -86.2448794779761 1614029.47185498 T 31 CATAB v2.0f-lin.ifort 2020-Jan-28 19:47:50 2020-Jan-28 19:47
1943-Jul-28 19:18 00:01 Jupiter 1.91786752345618 1.91786678798013 1.91786825893354 3.26219254062413 3.1238764388897 2430934.304170649 1.4204482985048 113.775875651379 14.7994436887409 -77.4804096044585 2329622.9188217 T 31 CATAB v2.0f-lin.ifort 2020-Jan-28 19:47:50 2020-Jan-28 19:47
2017-May-21 07:47 < 00:01 Jupiter 1.76397680612553 1.76397635742866 1.76397725483013 1.21597435203995 0.719887497586079 2457894.823994496 0.305173204440842 531.350690134925 265.89054334988 -36.8567503894768 2129283.63085847 T 31 CATAB v2.0f-lin.ifort 2020-Jan-28 19:47:50 2020-Jan-28 19:47
2027-Oct-28 02:46 < 00:01 Jupiter 1.70933362190655 1.70933315922874 1.70933408458602 2.24036257085386 2.00702980308189 2461706.615069150 0.450456410443853 339.997859036747 13.8141768920094 -85.4629564714256 2155082.96630223 T 31 CATAB v2.0f-lin.ifort 2020-Jan-28 19:47:50 2020-Jan-28 19:47
2038-Apr-24 02:39 < 00:01 Jupiter 1.99383042382079 1.99382979957379 1.99383104806814 3.55950439630176 3.43808494097757 2465537.610297983 0.685903975933842 73.3554176504104 17.0942816851383 -73.7841118277247 2773323.06528056 T 31 CATAB v2.0f-lin.ifort 2020-Jan-28 19:47:50 2020-Jan-28 19:47
2101-Oct-12 16:33 00:02 Jupiter 1.97294603906181 1.97294508888464 1.97294698923875 2.34285994695922 2.15182607230796 2488719.189876136 2.04753991927637 94.3992749444773 14.0777309834997 77.102843345068 1453199.77696527 T 31 CATAB v2.0f-lin.ifort 2020-Jan-28 19:47:50 2020-Jan-28 19:47
2112-Feb-14 14:11 00:02 Jupiter 1.73017865278712 1.73017799169135 1.7301793138945 1.18210282993269 0.646723611821176 2492496.090724803 2.34135712302689 1032.02481241741 480.09451108378 -20.6443673659164 1384964.36092511 T 31 CATAB v2.0f-lin.ifort 2020-Jan-28 19:47:50 2020-Jan-28 19:47
2122-Jul-24 16:03 00:02 Jupiter 1.75464215341017 1.75464130706017 1.75464299976337 2.38674227448292 2.17510321619949 2496309.168721382 2.44129256937092 268.611338442331 14.8900696786972 -85.8881916423838 1129917.74996006 T 31 CATAB v2.0f-lin.ifort 2020-Jan-28 19:47:50 2020-Jan-28 19:47
2196-Jul-09 10:17 00:04 Jupiter 1.90786643469622 1.9078648758822 1.90786799351067 2.01902278434993 1.78564458223614 2523322.928580526 4.2780599977585 221.044581681033 25.2778492266034 58.1069830852904 1315486.0972477 T 31 CATAB v2.0f-lin.ifort 2020-Jan-28 19:47:50 2020-Jan-28 19:47

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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