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181688 (2331 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2181688
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2196902945591559 6.6845e-08  
a 2.392425732771584 1.4957e-08 au
q 1.86683301882809 1.6152e-07 au
i .7388435154886437 7.2634e-06 deg
node 174.1052706765311 0.00054745 deg
peri 233.7695808375937 0.00054774 deg
M 248.2436532296057 2.1077e-05 deg
tp 2459620.090667605761
(2022-Feb-09.59066761)
8.2151e-05 TDB
period 1351.624714866663
3.70
1.2675e-05
3.47e-08
d
yr
n .2663461211091526 2.4977e-09 deg/d
Q 2.918018446715077 1.8243e-08 au
  Orbit Determination Parameters
   # obs. used (total)      198  
   data-arc span      17069 days (46.73 yr)  
   first obs. used      1973-09-30  
   last obs. used      2020-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .59474  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:31:37  

Additional Information
 Earth MOID = .876036 au 
 Jupiter MOID = 2.4716 au 
 T_jup = 3.498 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456929.5 (2014-Sep-29.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2189414117534946 6.6632e-08  
q 1.868196919582361 1.6054e-07 au
tp 2456918.912837677920
(2014-Sep-18.41283768)
6.5367e-05 TDB
node 174.151996973703 0.00054911 deg
peri 233.9957103024978 0.0005494 deg
i .7368006560516048 7.2605e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      198  
   data-arc span      17069 days (46.73 yr)  
   first obs. used      1973-09-30  
   last obs. used      2020-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .59474  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:31:37  

Additional Information
 Jupiter MOID = 2.4716 au 
 T_jup = 3.498 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.439788349216128E-15 -1.066921196214822E-14 -5.161713825485838E-13 2.799944876750438E-15 -2.029197466029763E-13 -4.662413223247461E-16
q -1.066921196214822E-14 2.577435215724806E-14 1.659352570349421E-12 -7.81061908495417E-15 5.868912306238713E-13 1.141099037711012E-15
tp -5.161713825485838E-13 1.659352570349421E-12 4.272855826555378E-9 -4.029088979539524E-11 1.197121622192349E-9 -1.328969577644641E-13
node 2.799944876750438E-15 -7.81061908495417E-15 -4.029088979539524E-11 3.015264897261465E-7 -3.01511802094522E-7 5.322002770089083E-10
peri -2.029197466029763E-13 5.868912306238713E-13 1.197121622192349E-9 -3.01511802094522E-7 3.018396292978599E-7 -5.322152174983078E-10
i -4.662413223247461E-16 1.141099037711012E-15 -1.328969577644641E-13 5.322002770089083E-10 -5.322152174983078E-10 5.271457378286835E-11

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 17.57   n/a E2021B55  

181688 (2331 T-2)          Discovered 1973-Sep-30 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 20080321/Numbers.arcLast Updated: 2008-03-26

[ show close-approach data ]
Alternate Designations
 2331 T-2 = 1999 TL264 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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