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38 Leda
Classification: Main-belt Asteroid          SPK-ID: 2000038
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 82 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1555854822967537 3.4361e-08  
a 2.740241992345686 7.8367e-09 AU
q 2.313900120356765 9.4403e-08 AU
i 6.974021659330383 4.1231e-06 deg
node 295.7627422167959 3.5847e-05 deg
peri 169.7627346083995 3.8153e-05 deg
M 16.59890537716589 1.3457e-05 deg
tp 2456924.106087784388
(2014-Sep-23.60608778)
6.184e-05 JED
period 1656.844699859126
4.54
7.1075e-06
1.946e-08
d
yr
n .2172804729559802 9.3209e-10 deg/d
Q 3.166583864334607 9.056e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1458  
   data-arc span      57948 days (158.65 yr)  
   first obs. used      1856-01-29  
   last obs. used      2014-09-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .57832  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 13:44:14  

Additional Information
 Earth MOID = 1.33098 AU 
 T_jup = 3.322 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.32 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 25
diameter diameter 115.93 km 2.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 25
rotation period rot_per 12.838 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Published Reference List:
[De Young, J.A.; Schmidt, R.E. (1996) Minor Planet Bul. 23, 44.]
[Pilcher, F. (2009) Minor Planet Bul. 36, 25-27.]
[Pilcher, F. (2010) Minor Planet Bul. 37, 119-122.]
[Pilcher, F. (2011) Minor Planet Bul. 38, 183-185.]
[Pilcher, F. (2013) Minor Planet Bul. 40, 33.]
[Franco, L.; Pilcher, F.; Durech, J. (2013) Minor Planet Bul. 40, 229-231.]
geometric albedo albedo 0.0618   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 25
B-V BV .726 mag .021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=4; phase (min.=4.56, mean=11.52, max.=18.34) deg.
U-B UB .419 mag .030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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          Discovered 1856-Jan-12 by Chacornac, J. at Paris
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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