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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.


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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2458849.5 (2020-Jan-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08857261385730482 2.3159e-10  
q 2.15270823108896 1.9254e-09 au
tp 2458247.803833145527
(2018-May-09.30383315)
4.1075e-06 TDB
node 103.8092892453337 3.8797e-07 deg
peri 150.8357762126256 1.7978e-07 deg
i 7.14181494423702 2.1702e-07 deg
  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
 Jupiter MOID = 2.46837 au 
 T_jup = 3.535 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.363605359073425E-20 -4.447209358950594E-19 -9.468875639387323E-16 -8.285700772120846E-17 -3.1951277911456E-17 5.02000828988549E-17
q -4.447209358950594E-19 3.706982470403254E-18 7.906268952768047E-15 7.04949720011888E-16 2.532801921933749E-16 -4.154154397207632E-16
tp -9.468875639387323E-16 7.906268952768047E-15 1.687189630446177E-11 1.512471086244402E-12 5.321256375707258E-13 -8.840261672360678E-13
node -8.285700772120846E-17 7.04949720011888E-16 1.512471086244402E-12 1.505179562188086E-13 3.24714246923201E-14 -7.617737479051041E-14
peri -3.1951277911456E-17 2.532801921933749E-16 5.321256375707258E-13 3.24714246923201E-14 3.231921988738844E-14 -3.102925388768283E-14
i 5.02000828988549E-17 -4.154154397207632E-16 -8.840261672360678E-13 -7.617737479051041E-14 -3.102925388768283E-14 4.709573846035369E-14

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 17.288245 km^3/s^2 0.000012 Konopliv et al. 2014, Icarus, 240, 103  
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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