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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 ]

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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.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08872145978916499 2.3321e-10  
a 2.361417893971132 1.5143e-09 au
q 2.151909451245757 1.9286e-09 au
i 7.141771087953539 2.1706e-07 deg
node 103.8108039679376 3.8808e-07 deg
peri 150.7285410950405 1.7893e-07 deg
M 95.86193772405923 1.2068e-06 deg
tp 2458247.559575009090
(2018-May-09.05957501)
4.1037e-06 TDB
period 1325.432763131374
3.63
1.2749e-06
3.49e-09
d
yr
n .2716094018601813 2.6125e-10 deg/d
Q 2.570926336696506 1.6486e-09 au
  Orbit Determination Parameters
   # obs. used (total)      9397  
   # delay obs. used      2977  
   # Doppler obs. used      0  
   data-arc span      25372 days (69.46 yr)  
   first obs. used      1950-09-23  
   last obs. used      2020-03-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .3998  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2020-Apr-06 17:19:16  

Additional Information
 Earth MOID = 1.13948 au 
 Jupiter MOID = 2.46988 au 
 T_jup = 3.535 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 3.0   n/a MPO492748 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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