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

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1866875792496808 6.7179e-08  
a 2.419196153699009 1.391e-08 AU
q 1.967562280034802 1.6045e-07 AU
i 3.361312059360212 6.9738e-06 deg
node 46.88757095995515 9.9702e-05 deg
peri 291.3217165533019 0.00010132 deg
M 247.5961181823803 1.9428e-05 deg
tp 2457429.625043797908
(2016-Feb-11.12504380)
7.5266e-05 JED
period 1374.374383421258
3.76
1.1853e-05
3.245e-08
d
yr
n .2619373617135128 2.2591e-09 deg/d
Q 2.870830027363216 1.6506e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      937  
   data-arc span      30940 days (84.71 yr)  
   first obs. used      1929-10-01  
   last obs. used      2014-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55268  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Aug-13 14:09:57  

Additional Information
 Earth MOID = .962151 AU 
 T_jup = 3.488 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.2 mag n/a MPO256917  

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

[ show close-approach data ]
Alternate Designations
 1929 TD1 = 1978 SR5 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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