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6 Hebe (A847 NA)
Classification: Main-belt Asteroid          SPK-ID: 2000006
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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 95 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2032777313712122 1.9772e-08  
a 2.424564028093204 2.6377e-09 au
q 1.93170415289817 4.8089e-08 au
i 14.73973321833338 2.1871e-06 deg
node 138.6429159915694 1.1204e-05 deg
peri 239.7076643301936 1.2978e-05 deg
M 242.9448200723775 7.3905e-06 deg
tp 2459648.870518812478
2.8606e-05 TDB
period 1378.951250788707
n .2610679672643205 4.2602e-10 deg/d
Q 2.917423903288239 3.1738e-09 au
  Orbit Determination Parameters
   # obs. used (total)      6164  
   data-arc span      62983 days (172.44 yr)  
   first obs. used      1848-09-05  
   last obs. used      2021-02-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41206  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:43:21  

Additional Information
 Earth MOID = .97205 au 
 Jupiter MOID = 2.63999 au 
 T_jup = 3.439 
[ 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 5.65   n/a E2021B10 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. 2020-October); 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.]
[Gil Hutton, R.; Blain, A. (1988) Minor Planet Bull. 15, 3-4.]
[Michalowski, T. (1988) Acta Astronomica 38, 455-468.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Dotto, E.; De Angelis, G.; Di Martino, M.; Barucci, M.A.; et al. (1995) Icarus 117, 313-327.]
[Riccioli, D.; Blanco, C.; Cigna, M. (2001) Planet. 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.]
[Marset, M.; Carry, B.; Dumas, C.; Hanus, J.; et al. (2017) Astron. Astrophys. 604, A64.]
[Cellino, A.; Hestroffer, D.; Lu, X.-P.; Muinonen, K.; Tanga, P. (2019) Astron. Astrophys. 631, A67.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.2679   0.008 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
B-V BV 0.822   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=27; phase (min.=1.33, mean=14.50, max.=28.87) deg.
U-B UB 0.399   0.019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 (A847 NA)          Discovered 1847-Jul-01 by Hencke, K. L. at Driesen
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A847 NA = 1947 JB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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