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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 ]

[ show orbit diagram ]
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 
[ show covariance matrix ]

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 8.5   n/a MPO502153 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 1.99102620865646 1.99102592710211 1.99102649021082 3.07159649617146 2.92982335448943 2446311.496322589 0.241593431774037 94.1001399063952 10.782922882008 87.5209138493712 4259906.23161405 T 110 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:12 2020-Nov-13 04:34
2044-Jun-04 10:01 < 00:01 Jupiter 1.99255923532872 1.99255893689454 1.99255953376302 3.06397272610281 2.92194170634204 2467770.917279357 0.368509494910782 83.5046496381406 10.0211452652274 85.0950736225166 3969141.26653777 T 110 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:12 2020-Nov-13 04:34
2140-Jan-18 22:13 00:01 Jupiter 1.9887865194957 1.98878620327978 1.98878683571173 3.00843740765181 2.86337166780328 2502696.425785922 1.25115879112733 115.292559690447 11.9582839393738 86.4923648492286 4075455.32798635 T 110 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:12 2020-Nov-13 04:34
2198-Oct-20 03:12 00:02 Jupiter 1.97518072277107 1.9751803675208 1.97518107802145 3.0187161914326 2.87314837860755 2524155.633363518 1.77247284040633 92.8007493409169 11.6196560000264 84.8929496232372 3506686.36420363 T 110 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:12 2020-Nov-13 04:34

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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