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4 Vesta (A807 FA)
Classification: Main-belt Asteroid          SPK-ID: 2000004
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08835129814320758 2.3164e-10  
a 2.361659442321478 1.5311e-09 au
q 2.153003764820212 1.9409e-09 au
i 7.141541476963601 2.17e-07 deg
node 103.8060593198425 3.8804e-07 deg
peri 151.0156026579555 1.7997e-07 deg
M 311.692060535616 1.4166e-06 deg
tp 2459574.385417140912
(2021-Dec-25.88541714)
5.3895e-06 TDB
period 1325.636135193513
3.63
1.2892e-06
3.53e-09
d
yr
n .2715677329868865 2.6409e-10 deg/d
Q 2.570315119822744 1.6664e-09 au
  Orbit Determination Parameters
   # obs. used (total)      9451  
   # delay obs. used      2977  
   # Doppler obs. used      0  
   data-arc span      25743 days (70.48 yr)  
   first obs. used      1950-09-23  
   last obs. used      2021-03-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40095  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2021-Apr-13 11:15:57  

Additional Information
 Earth MOID = 1.14088 au 
 Jupiter MOID = 2.46837 au 
 T_jup = 3.535 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 3.31   n/a MPCxxxxx IRAS observations used: 2
magnitude slope G 0.32   n/a PDS3 (MPC 17257) Fit
diameter diameter 525.4 km 0.2 Science, v. 336 (6082), pp. 684-686  
extent extent 572.6 x 557.2 x 446.4 km 0.2 x 0.2 x 0.2 Science, v. 336 (6082), pp. 684-686  
GM GM 17.8 km^3/s^2 n/a JPL IOM 312.F01-006  
bulk density density 3.456 g/cm^3 1% Science, v. 336 (6082), pp. 684-686  
rotation period rot_per 5.34212766 h 0.00000001 Science, v. 336 (6082), pp. 684-686 Rotation rate (deg/day): 1617.333119 +/-0.000003
pole direction pole 309.03/42.23   0.01/0.01 Science, v. 336 (6082), pp. 684-686 values in degrees
geometric albedo albedo 0.4228   0.053 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
B-V BV 0.782   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=23; phase (min.=1.73, mean=14.92, max.=24.69) deg.
U-B UB 0.492   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=23; phase (min.=1.73, mean=15.34, max.=24.69) deg.
Tholen spectral type spec_T V   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B V   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)

4 Vesta (A807 FA)          Discovered 1807-Mar-29 by Olbers, H. W. at Bremen
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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