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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 112 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1545581906416658 2.6813e-08  
a 2.738864106687538 5.0876e-09 au
q 2.31555022594451 7.1845e-08 au
i 6.971268462675305 5.1357e-07 deg
node 295.7220954565041 3.1636e-06 deg
peri 169.2458199648446 4.7097e-06 deg
M 135.4826342211952 3.5541e-06 deg
tp 2458577.432232327115
(2019-Apr-03.93223233)
1.5563e-05 TDB
period 1655.595181268981
4.53
4.6131e-06
1.263e-08
d
yr
n .217444459897538 6.0588e-10 deg/d
Q 3.162177987430566 5.8739e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2997  
   data-arc span      60143 days (164.66 yr)  
   first obs. used      1856-01-29  
   last obs. used      2020-09-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42442  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:11:30  

Additional Information
 Earth MOID = 1.33265 au 
 Jupiter MOID = 1.97525 au 
 T_jup = 3.323 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456917.5 (2014-Sep-17.0) TDB
Reference: JPL 112 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1554299396346729 2.677e-08  
q 2.313949800398991 7.186e-08 au
tp 2456924.240334631670
(2014-Sep-23.74033463)
1.4284e-05 TDB
node 295.7628912875686 3.161e-06 deg
peri 169.8038305896595 4.7351e-06 deg
i 6.974614098469116 5.1379e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2997  
   data-arc span      60143 days (164.66 yr)  
   first obs. used      1856-01-29  
   last obs. used      2020-09-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42442  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:11:30  

Additional Information
 Jupiter MOID = 1.97525 au 
 T_jup = 3.323 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.166089054601736E-16 -1.920717219164712E-15 -3.928999283834607E-14 -9.240587710527293E-16 -5.173673939398712E-14 1.467359638528365E-15
q -1.920717219164712E-15 5.163867686659354E-15 1.130826042499173E-13 2.114527431725334E-15 1.410221073812779E-13 -4.051637896587658E-15
tp -3.928999283834607E-14 1.130826042499173E-13 2.040355202797434E-10 5.266319314959399E-13 4.591796947544724E-11 2.828211855255942E-12
node -9.240587710527293E-16 2.114527431725334E-15 5.266319314959399E-13 9.99202520476817E-12 -9.280291001884443E-12 -5.781459038695721E-13
peri -5.173673939398712E-14 1.410221073812779E-13 4.591796947544724E-11 -9.280291001884443E-12 2.242155659337489E-11 1.250577609945587E-12
i 1.467359638528365E-15 -4.051637896587658E-15 2.828211855255942E-12 -5.781459038695721E-13 1.250577609945587E-12 2.639779716821665E-13

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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1985-Sep-02 23:55 < 00:01 Jupiter 1.99102642186113 1.99102625454363 1.99102658917875 3.07159843007494 2.92982539832468 2446311.496335421 0.221701889060669 20.4962496125201 3.67650822271337 77.1581385347525 10042624.893001 T 112 CATAB v2.0f-lin.ifort 2021-Apr-12 10:12:38 2021-Apr-12 10:12
2044-Jun-04 10:01 < 00:01 Jupiter 1.99255936829334 1.99255912512218 1.99255961146451 3.06397483963542 2.92194393312194 2467770.917295065 0.283196562537017 23.1111809263758 3.60288170775681 69.0326387595239 10468917.7312562 T 112 CATAB v2.0f-lin.ifort 2021-Apr-12 10:12:38 2021-Apr-12 10:12
2140-Jan-18 22:13 00:01 Jupiter 1.98878670013481 1.98878655515258 1.98878684511726 3.00843904642478 2.86337340393223 2502696.425670116 1.07195993839273 58.4018545526871 3.01837105815384 84.2795393635578 10776423.8233249 T 112 CATAB v2.0f-lin.ifort 2021-Apr-12 10:12:38 2021-Apr-12 10:12
2198-Oct-20 03:12 00:02 Jupiter 1.97518089195734 1.9751805847065 1.9751811992084 3.01871826873412 2.87315057476446 2524155.633190151 1.53009483372395 34.5540436387304 3.47340927149653 71.9640639990241 10383947.8530929 T 112 CATAB v2.0f-lin.ifort 2021-Apr-12 10:12:38 2021-Apr-12 10:12

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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