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4739 Tomahrens (1985 TH1)
Classification: Main-belt Asteroid          SPK-ID: 2004739
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06463497713189942 1.1897e-08  
a 2.742884221976242 1.0275e-08 au
q 2.56559796301336 3.5378e-08 au
i 1.753253316960938 7.9888e-07 deg
node 172.4565990746318 4.0033e-05 deg
peri 270.4247733273435 4.6514e-05 deg
M 260.2688804080204 2.2073e-05 deg
tp 2459856.161187856221
(2022-Oct-03.66118786)
0.00010307 TDB
period 1659.241652006354
4.54
9.3236e-06
2.553e-08
d
yr
n .2169665880582784 1.2192e-09 deg/d
Q 2.920170480939124 1.0939e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2434  
   data-arc span      22916 days (62.74 yr)  
   first obs. used      1958-11-11  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45398  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 10:47:07  

Additional Information
 Earth MOID = 1.58221 au 
 Jupiter MOID = 2.21455 au 
 T_jup = 3.345 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.14   n/a MPO636135  
diameter diameter 6.983 km 0.277 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.104 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.251   0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4739 Tomahrens (1985 TH1)          Discovered 1985-Oct-15 by Bowell, E. at Flagstaff
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1985 TH1 = 1958 VT = 1973 AH3 = 1976 UY2 = 1982 BF11 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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