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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455197.5 (2010-Jan-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0887310554696549 2.4897e-10  
q 2.152357682350535 1.9752e-09 au
tp 2455592.721444437607
(2011-Jan-31.22144444)		 1.5328e-06 TDB
node 103.9148495024658 3.8844e-07 deg
peri 149.8372802489448 1.7784e-07 deg
i 7.134430829297838 2.1685e-07 deg
   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
 Jupiter MOID = 2.46988 au 
 T_jup = 3.535 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.198684770643852E-20 -4.906630618442768E-19 -3.803553625964577E-16 -8.937315535444043E-17 -3.35136497440534E-17 5.391405131164477E-17
q -4.906630618442768E-19 3.901226291455867E-18 3.027022124760274E-15 7.240660583923436E-16 2.541424804392295E-16 -4.25800412819756E-16
tp -3.803553625964577E-16 3.027022124760274E-15 2.349340817912924E-12 5.632231822719968E-13 1.960002619740353E-13 -3.3000913563241E-13
node -8.937315535444043E-17 7.240660583923436E-16 5.632231822719968E-13 1.508834099157359E-13 3.14250307914941E-14 -7.619338994607295E-14
peri -3.35136497440534E-17 2.541424804392295E-16 1.960002619740353E-13 3.14250307914941E-14 3.162701976751853E-14 -3.03999021042515E-14
i 5.391405131164477E-17 -4.25800412819756E-16 -3.3000913563241E-13 -7.619338994607295E-14 -3.03999021042515E-14 4.702223760345318E-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 3.0   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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