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38 Leda (A856 AA)
Classification: Main-belt Asteroid          SPK-ID: 2000038
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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 110 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1547417218413425 3.5152e-08  
a 2.73864013188233 5.895e-09 au
q 2.314858242371057 9.5807e-08 au
i 6.971279645845406 3.7986e-06 deg
node 295.7222356245596 3.151e-05 deg
peri 169.24078422 3.3674e-05 deg
M 91.97851686519239 1.2292e-05 deg
tp 2458577.554137809925
(2019-Apr-04.05413781)
5.6188e-05 TDB
period 1655.392102175189
4.53
5.3449e-06
1.463e-08
d
yr
n .217471135404693 7.0217e-10 deg/d
Q 3.162422021393603 6.8072e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2960  
   data-arc span      60143 days (164.66 yr)  
   first obs. used      1856-01-29  
   last obs. used      2020-09-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42253  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:34:05  

Additional Information
 Earth MOID = 1.3321 au 
 Jupiter MOID = 1.97527 au 
 T_jup = 3.323 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454670.5 (2008-Jul-23.0) TDB
Reference: JPL 110 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1533102575042689 3.5203e-08  
q 2.320473346544391 9.5635e-08 au
tp 2455267.397130327686
(2010-Mar-11.89713033)
5.55e-05 TDB
node 295.7932866398621 3.148e-05 deg
peri 169.59156330908 3.3683e-05 deg
i 6.973090152951483 3.7996e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2960  
   data-arc span      60143 days (164.66 yr)  
   first obs. used      1856-01-29  
   last obs. used      2020-09-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42253  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:34:05  

Additional Information
 Jupiter MOID = 1.97527 au 
 T_jup = 3.323 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.239276260978022E-15 -3.362052445041078E-15 -3.458114119526414E-13 -2.967245264991186E-15 -8.030038577671316E-14 -7.333266186083552E-18
q -3.362052445041078E-15 9.146059101240703E-15 9.415155631032963E-13 8.644160219349042E-15 2.139680791679311E-13 -7.163482203778065E-17
tp -3.458114119526414E-13 9.415155631032963E-13 3.080269936274005E-9 -7.312950973334948E-12 6.824877428311042E-10 -1.847242325087081E-13
node -2.967245264991186E-15 8.644160219349042E-15 -7.312950973334948E-12 9.910104388349239E-10 -9.847219626558124E-10 -1.968619724832661E-11
peri -8.030038577671316E-14 2.139680791679311E-13 6.824877428311042E-10 -9.847219626558124E-10 1.134573110250801E-9 1.949086880772798E-11
i -7.333266186083552E-18 -7.163482203778065E-17 -1.847242325087081E-13 -1.968619724832661E-11 1.949086880772798E-11 1.443663610324857E-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 8.55   n/a E2021B10 IRAS observations used: 25
diameter diameter 92.255 km 0.490 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 12.838 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[De Young, J.A.; Schmidt, R.E. (1996) Minor Planet Bull. 23, 44.]
[Pilcher, F. (2009) Minor Planet Bull. 36, 25-27.]
[Pilcher, F. (2010) Minor Planet Bull. 37, 119-122.]
[Pilcher, F. (2011) Minor Planet Bull. 38, 183-185.]
[Franco, L.; Pilcher, F.; Durech, J. (2013) Minor Planet Bull. 40, 229-231.]
[Pilcher, F. (2013) Minor Planet Bull. 40, 33.]
geometric albedo albedo 0.055   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.726   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=4.56, mean=11.52, max.=18.34) deg.
U-B UB 0.419   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=4.56, mean=11.52, max.=18.34) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Cgh   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

38 Leda (A856 AA)          Discovered 1856-Jan-12 by Chacornac, J. at Paris
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A856 AA = 1949 QO2 = A904 SF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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