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1161 Thessalia (1929 SF)
Classification: Main-belt Asteroid          SPK-ID: 2001161
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08803183753560528 4.1526e-08  
a 3.169590169148079 1.6367e-08 au
q 2.890565322323184 1.3382e-07 au
i 9.396508498339085 3.9722e-06 deg
node 72.56420973800917 2.6422e-05 deg
peri 310.1720327633162 3.3596e-05 deg
M 26.73656701545964 2.0084e-05 deg
tp 2458847.424306443160
(2019-Dec-29.92430644)
0.00011516 TDB
period 2061.11912754536
5.64
1.5965e-05
4.371e-08
d
yr
n .174662393448715 1.3529e-09 deg/d
Q 3.448615015972974 1.7808e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2508  
   data-arc span      33270 days (91.09 yr)  
   first obs. used      1929-09-29  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45171  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:21:52  

Additional Information
 Earth MOID = 1.90613 au 
 Jupiter MOID = 1.98962 au 
 T_jup = 3.176 
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Orbital Elements at Epoch 2456717.5 (2014-Mar-01.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08643647027757394 4.1348e-08  
q 2.895606886571922 1.3252e-07 au
tp 2456761.515529067250
(2014-Apr-14.01552907)
0.00012167 TDB
node 72.9003796281838 2.654e-05 deg
peri 306.0373187197231 3.4021e-05 deg
i 9.375945050973977 3.9594e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2508  
   data-arc span      33270 days (91.09 yr)  
   first obs. used      1929-09-29  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45171  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:21:52  

Additional Information
 Jupiter MOID = 1.98962 au 
 T_jup = 3.176 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.709661186210764E-15 -5.445682894829527E-15 -2.117825628030875E-13 1.479967597248264E-16 -5.316616785284499E-14 -1.116047196415864E-16
q -5.445682894829527E-15 1.756206637944289E-14 2.739558554629724E-13 -1.61144949809048E-15 9.78077511097866E-14 1.127298879560571E-15
tp -2.117825628030875E-13 2.739558554629724E-13 1.480396743751424E-8 3.582413319322343E-12 2.621433121810231E-9 2.558076388732276E-12
node 1.479967597248264E-16 -1.61144949809048E-15 3.582413319322343E-12 7.043809006656966E-10 -6.93974410551817E-10 -2.818402172330585E-11
peri -5.316616785284499E-14 9.78077511097866E-14 2.621433121810231E-9 -6.93974410551817E-10 1.157455978366187E-9 2.813451966381727E-11
i -1.116047196415864E-16 1.127298879560571E-15 2.558076388732276E-12 -2.818402172330585E-11 2.813451966381727E-11 1.567694146715592E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.2   n/a MPO502164  
diameter diameter 21.498 km 0.184 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.065   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1161 Thessalia (1929 SF)          Discovered 1929-Sep-29 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1929 SF = 1931 BB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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