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20951 (4261 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2020951
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05576113339682591 5.0778e-08  
a 2.674011279942545 1.5155e-08 au
q 2.524905380257052 1.3751e-07 au
i 4.90346057246436 5.9261e-06 deg
node 49.54739100486629 5.2149e-05 deg
peri 13.61844010310378 7.0795e-05 deg
M 191.7460693668639 4.6544e-05 deg
tp 2459746.959066270386
(2022-Jun-16.45906627)
0.00020702 TDB
period 1597.141076265685
4.37
1.3578e-05
3.717e-08
d
yr
n .2254027558052198 1.9163e-09 deg/d
Q 2.823117179628039 1.6e-08 au
  Orbit Determination Parameters
   # obs. used (total)      884  
   data-arc span      17097 days (46.81 yr)  
   first obs. used      1973-09-19  
   last obs. used      2020-07-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54366  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:59:45  

Additional Information
 Earth MOID = 1.53798 au 
 Jupiter MOID = 2.35208 au 
 T_jup = 3.372 
[ 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 MPO474041  
diameter diameter 3.063 km 0.458 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.272   0.076 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20951 (4261 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
 4261 T-2 = 1993 FA7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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