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3948 Bohr (1985 RF)
Classification: Main-belt Asteroid          SPK-ID: 2003948
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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1949637756764666 1.4562e-08  
a 2.262660047506092 4.855e-09 au
q 1.821523301572011 3.2898e-08 au
i 2.730194235626677 4.0371e-07 deg
node 190.6401906349335 1.6893e-05 deg
peri 121.0611759570797 1.7147e-05 deg
M 161.2105804019389 3.9812e-06 deg
tp 2458643.803577595290
(2019-Jun-09.30357760)
1.3163e-05 TDB
period 1243.161035497923
3.40
4.0012e-06
1.095e-08
d
yr
n .2895843657582216 9.3205e-10 deg/d
Q 2.703796793440173 5.8016e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2886  
   data-arc span      16594 days (45.43 yr)  
   first obs. used      1975-10-14  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47165  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:19:28  

Additional Information
 Earth MOID = .807238 au 
 Jupiter MOID = 2.56991 au 
 T_jup = 3.592 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457079.5 (2015-Feb-26.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1951711067913405 1.4569e-08  
q 1.82049011321889 3.2921e-08 au
tp 2457401.637818955956
(2016-Jan-14.13781896)
1.2705e-05 TDB
node 190.6689928118593 1.6887e-05 deg
peri 121.1719519052407 1.7141e-05 deg
i 2.730680045762927 4.0387e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2886  
   data-arc span      16594 days (45.43 yr)  
   first obs. used      1975-10-14  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47165  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:19:28  

Additional Information
 Jupiter MOID = 2.56991 au 
 T_jup = 3.592 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.122564805577347E-16 -4.762624687515486E-16 7.541243613753281E-15 1.475100304212294E-14 8.816501936829332E-15 -7.078864475559493E-18
q -4.762624687515486E-16 1.083824673170835E-15 -1.927729797229771E-14 -3.367635195942362E-14 -2.089699967957194E-14 3.192925275952112E-18
tp 7.541243613753281E-15 -1.927729797229771E-14 1.61406425993383E-10 8.531764703175725E-12 4.246674912909263E-11 -5.12885372856833E-13
node 1.475100304212294E-14 -3.367635195942362E-14 8.531764703175725E-12 2.851661712627551E-10 -2.801153209140831E-10 2.491160458952409E-12
peri 8.816501936829332E-15 -2.089699967957194E-14 4.246674912909263E-11 -2.801153209140831E-10 2.938282349749096E-10 -2.603025747275246E-12
i -7.078864475559493E-18 3.192925275952112E-18 -5.12885372856833E-13 2.491160458952409E-12 -2.603025747275246E-12 1.63114441945061E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.46   n/a MPCxxxxx  
diameter diameter 5.144 km 0.211 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 24.884 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Klinglesmith III, D.A.; Risley, E.; Turk, J.; Vargas, A.; et al. (2013) Minor Planet Bull. 40, 15-16.]
[Owings, L. (2013) Minor Planet Bull. 40, 104-106.]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.320   0.079 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3948 Bohr (1985 RF)          Discovered 1985-Sep-15 by Jensen, P. at Brorfelde
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1985 RF = 1975 TG5 = 1975 VH7 = 1978 NR1 = 1981 JF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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