Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
JPL Small-Body Database Browser
Search: [ help ]  
6 Hebe
Classification: Main-belt Asteroid          SPK-ID: 2000006
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]
Orbit Diagram
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 2-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 has stopped working because of a recent Java upgrade, here is a possible workaround.
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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 82 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2022303407069146 1.9142e-08  
a 2.426216076420658 1.9678e-09 au
q 1.935561572657514 4.6381e-08 au
i 14.73796733814745 2.1012e-06 deg
node 138.6747977454348 1.0783e-05 deg
peri 239.7381375367004 1.2467e-05 deg
M 185.2838172025677 6.9017e-06 deg
tp 2458270.420508036551
2.6666e-05 JED
period 1380.360874600695
n .2608013647910292 3.1728e-10 deg/d
Q 2.9168705801838 2.3657e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5455  
   data-arc span      60166 days (164.73 yr)  
   first obs. used      1848-09-08  
   last obs. used      2013-06-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53367  
   data source      ORB  
   producer      Davide Farnocchia  
   solution date      2013-Jul-16 08:46:52  

Additional Information
 Earth MOID = .976251 au 
 Jupiter MOID = 2.63088 au 
 T_jup = 3.438 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 5.71 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
magnitude slope G 0.24   n/a PDS3 (MPC 17257) Fit
diameter diameter 185.18 km 2.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
rotation period rot_per 7.2745 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Ahmad, I.I. (1954) Astrophys. J. 120, 551-560.]
[Yang, X.-y.; Zhang, Y.-y.; Li, X.-q. (1965) Acta Astron. Sin. 13, 66-74.]
[Gehrels, T.; Taylor, R.C. (1977) Astron. J. 82, 229-237.]
[Di Martino, M.; Cacciatori, S. (1984) Icarus 60, 75-82.]
[Magnusson, P. (1986) Icarus 68, 1-39.]
[Michalowski, T. (1988) Acta Astronomica 38, 455-468.]
[Gil Hutton, R.; Blain, A. (1988) Minor Planet Bul. 15, 3-4.]
[Dotto, E.; De Angelis, G.; Di Martino, M.; Barucci, M.A.; et al. (1995) Icarus 117, 313-327.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Riccioli, D.; Blanco, C.; Cigna, M. (2001) Planetary and Space Sci. 49, 657-671.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Behrend, R. (2012) Observatoire de Geneve web site,]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
geometric albedo albedo 0.2679   0.008 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
B-V BV .822 mag .015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=27; phase (min.=1.33, mean=14.50, max.=28.87) deg.
U-B UB .399 mag .019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=24; phase (min.=1.33, mean=14.33, max.=28.87) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B S   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)

6 Hebe          Discovered 1847-Jul-01 by Hencke, K. L. at Driesen
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1947 JB 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
FirstGov 2016-May-06 16:49 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin