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1261 Legia (1933 FB)
Classification: Main-belt Asteroid          SPK-ID: 2001261
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1784554117073848 3.4565e-08  
a 3.137250844245127 1.2786e-08 au
q 2.577391453206022 1.0855e-07 au
i 2.427213133928991 3.7272e-06 deg
node 67.28515861643271 9.0519e-05 deg
peri 104.3852924382553 9.106e-05 deg
M 235.2720833921946 1.1679e-05 deg
tp 2459703.707447397747
(2022-May-04.20744740)
6.8207e-05 TDB
period 2029.655332568481
5.56
1.2408e-05
3.397e-08
d
yr
n .1773700165852438 1.0843e-09 deg/d
Q 3.697110235284231 1.5068e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3178  
   data-arc span      31993 days (87.59 yr)  
   first obs. used      1933-03-23  
   last obs. used      2020-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43866  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:20:50  

Additional Information
 Earth MOID = 1.58442 au 
 Jupiter MOID = 1.27188 au 
 T_jup = 3.185 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456551.5 (2013-Sep-16.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1778333342031048 3.4757e-08  
q 2.580315833149581 1.0922e-07 au
tp 2455647.443590227064
(2011-Mar-26.94359023)
5.7951e-05 TDB
node 67.31690722346143 9.0566e-05 deg
peri 104.9643273682892 9.11e-05 deg
i 2.426803301364187 3.7244e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3178  
   data-arc span      31993 days (87.59 yr)  
   first obs. used      1933-03-23  
   last obs. used      2020-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43866  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:20:50  

Additional Information
 Jupiter MOID = 1.27188 au 
 T_jup = 3.185 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.20806095270707E-15 -3.778287209435081E-15 3.959808782545686E-13 -2.032082661959436E-15 7.465007396637963E-14 1.623473459380309E-16
q -3.778287209435081E-15 1.192871141225736E-14 -1.110581931688415E-12 5.160622281035207E-15 -2.035985071286873E-13 -4.059553416664399E-16
tp 3.959808782545686E-13 -1.110581931688415E-12 3.358316885090126E-9 -2.263672394791943E-12 5.93375239304562E-10 4.271848269491169E-14
node -2.032082661959436E-15 5.160622281035207E-15 -2.263672394791943E-12 8.202173108294656E-9 -8.195046124007964E-9 -8.920434872784743E-11
peri 7.465007396637963E-14 -2.035985071286873E-13 5.93375239304562E-10 -8.195046124007964E-9 8.299293851338129E-9 8.913809564362924E-11
i 1.623473459380309E-16 -4.059553416664399E-16 4.271848269491169E-14 -8.920434872784743E-11 8.913809564362924E-11 1.387119827408175E-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 11.2   n/a MPO350808  
diameter diameter 32.576 km 0.126 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 8.693 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.067   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1261 Legia (1933 FB)          Discovered 1933-Mar-23 by Delporte, E. at Uccle
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1933 FB = 1938 CS = 1938 DH = 1944 FD = 1966 DG 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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