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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1119838789673624 3.9271e-08  
a 3.097137854972305 2.4998e-08 au
q 2.75030834427585 1.3173e-07 au
i 10.24030692980545 6.3664e-06 deg
node 195.9010532409715 2.3666e-05 deg
peri 86.96489257360709 3.7593e-05 deg
M 271.8958476277923 2.8846e-05 deg
tp 2459487.728975692450
(2021-Sep-30.22897569)
0.00016069 TDB
period 1990.853172371161
5.45
2.4103e-05
6.599e-08
d
yr
n .1808269966846576 2.1893e-09 deg/d
Q 3.443967365668759 2.7798e-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.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59554  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:59:49  

Additional Information
 Earth MOID = 1.75924 au 
 Jupiter MOID = 1.74985 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 14.8   n/a MPO435894  
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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