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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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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

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
4.1037e-06 TDB
period 1325.432763131374
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 
[ 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 3.0   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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