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46 Hestia (A857 QA)
Classification: Main-belt Asteroid          SPK-ID: 2000046
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 159 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1723017510121078 2.8653e-08  
a 2.525194782320591 3.828e-09 au
q 2.090099299680114 7.1903e-08 au
i 2.350036412978603 2.9826e-06 deg
node 181.0771634273368 7.9218e-05 deg
peri 177.3830395148111 7.9871e-05 deg
M 168.1565818228954 1.1784e-05 deg
tp 2458315.875996557849
4.7396e-05 TDB
period 1465.685366385207
n .245618881279999 5.585e-10 deg/d
Q 2.960290264961067 4.4875e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3915  
   data-arc span      57076 days (156.27 yr)  
   first obs. used      1864-04-05  
   last obs. used      2020-07-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48814  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:34:01  

Additional Information
 Earth MOID = 1.08634 au 
 Jupiter MOID = 2.48908 au 
 T_jup = 3.432 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.5   n/a MPO502153 IRAS observations used: 8
magnitude slope G 0.06   n/a PDS3 (MPC 17257) Fit
diameter diameter 131.471 km 22.151 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 21.040 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Scaltriti, F.; Zappala, V.; Harris, A.W. (1981) Icarus 46, 275-280.]
[Pilcher, F. (2012) Minor Planet Bull. 39, 171-173.]
[Pilcher, F. (2017) Minor Planet Bull. 44, 294-297.]
[Pilcher, F. (2018) Posting on CALL web site:]
[Franco, L.; Pilcher, F. (2019) Minor Planet Bull. 46, 140-142.]
geometric albedo albedo 0.046   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.692   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=5.29, mean=10.53, max.=19.03) deg.
U-B UB 0.226   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=5.29, mean=11.62, max.=19.03) deg.
Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Xc   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)

46 Hestia (A857 QA)          Discovered 1857-Aug-16 by Pogson, N. R. at Oxford
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1949-Dec-04 20:18 < 00:01 Hebe 0.0391814245600655 0.0391808754745976 0.0391819737082385 5.08358207952489 5.08358204831391 2433255.346110486 0.287719771067236 91.5799204405754 12.2627643810806 74.3565443306676 460419.803528499 T 159 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:12 2020-Nov-13 04:34
2014-Feb-18 23:50 < 00:01 Hebe 0.0416815008156986 0.0416809420273224 0.0416820596151104 5.05078452113813 5.05078449160868 2456707.492870251 0.289627065596048 46.7647799264475 12.1420364076346 56.2829412593984 433346.494961917 T 159 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:12 2020-Nov-13 04:34

Alternate Designations
 A857 QA = 1935 EY 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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