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7150 McKellar (1929 TD1)
Classification: Main-belt Asteroid          SPK-ID: 2007150
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1856716722860781 3.2838e-08  
a 2.420384635983935 8.5888e-09 au
q 1.970987773045267 8.0255e-08 au
i 3.358474162773104 3.9946e-06 deg
node 46.86985815217545 6.6639e-05 deg
peri 291.1210957814111 6.7569e-05 deg
M 103.8478673324631 1.2289e-05 deg
tp 2458803.747118672218
(2019-Nov-16.24711867)
4.6353e-05 TDB
period 1375.387294384544
3.77
7.3209e-06
2.004e-08
d
yr
n .2617444566121954 1.3932e-09 deg/d
Q 2.869781498922602 1.0183e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1701  
   data-arc span      33348 days (91.30 yr)  
   first obs. used      1929-10-01  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .508  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:35:35  

Additional Information
 Earth MOID = .963161 au 
 Jupiter MOID = 2.51832 au 
 T_jup = 3.488 
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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 14.3   n/a MPO344359  
diameter diameter 8.439 km 0.149 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.052   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7150 McKellar           Discovered 1929 Oct. 11 by C. W. Tombaugh at the Lowell Observatory.
In 1941, Andrew McKellar (1910-1960) measured the temperature of interstellar space as about 2.7 Kelvin, based of the rotational spectrum of the cyanogen molecule. This radiation temperature arises from the cosmic primeval fireball and is one of the most fundamental and revealing cosmic parameters.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20100330/MPCPages.arcLast Updated: 2010-04-05

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Alternate Designations
 1929 TD1 = 1978 SR5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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