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20939 (1178 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2020939
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1120105687986274 3.9288e-08  
a 3.096545048715948 2.4918e-08 au
q 2.749699276498701 1.3175e-07 au
i 10.24134533815968 6.367e-06 deg
node 195.9009389272993 2.3664e-05 deg
peri 87.07026342150699 3.7587e-05 deg
M 307.9687020389533 2.8927e-05 deg
tp 2459488.158154420266
(2021-Sep-30.65815442)
0.00016064 TDB
period 1990.281612210093
5.45
2.4024e-05
6.577e-08
d
yr
n .1808789257718362 2.1833e-09 deg/d
Q 3.443390820933195 2.7709e-08 au
  Orbit Determination Parameters
   # obs. used (total)      545  
   data-arc span      17042 days (46.66 yr)  
   first obs. used      1973-09-24  
   last obs. used      2020-05-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .59527  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:05  

Additional Information
 Earth MOID = 1.75681 au 
 Jupiter MOID = 1.74989 au 
 T_jup = 3.189 
[ 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 14.85   n/a E2021B10  
diameter diameter 3.922 km 0.786 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.151   0.044 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20939 (1178 T-2)          Discovered 1973-Sep-29 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1178 T-2 = 1993 FL70 = 2000 QH166 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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