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100 Hekate (A868 NA)
Classification: Main-belt Asteroid          SPK-ID: 2000100
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1695552885909357 3.9297e-08  
a 3.089431762137787 1.1355e-08 au
q 2.565602268126512 1.2369e-07 au
i 6.431994780451404 4.4203e-06 deg
node 127.1816270821434 3.7595e-05 deg
peri 184.3863360475689 3.9884e-05 deg
M 319.3062917777115 1.5383e-05 deg
tp 2459224.702836976048
(2021-Jan-10.20283698)		 8.5169e-05 TDB
period 1983.427533084085
5.43		 1.0935e-05
2.994e-08		 d
yr
n .18150398438819 1.0007e-09 deg/d
Q 3.613261256149063 1.328e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2977  
   data-arc span      54721 days (149.82 yr)  
   first obs. used      1871-01-15  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42827  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:51:02  

Additional Information
 Earth MOID = 1.55137 au 
 Jupiter MOID = 1.66971 au 
 T_jup = 3.193 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455649.5 (2011-Mar-29.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1674812315078248 3.943e-08  
q 2.574776065500242 1.2454e-07 au
tp 2455266.037572131388
(2010-Mar-10.53757213)		 8.1132e-05 TDB
node 127.2577729393923 3.7635e-05 deg
peri 185.5896950232542 3.9974e-05 deg
i 6.426112829506535 4.4158e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      2977  
   data-arc span      54721 days (149.82 yr)  
   first obs. used      1871-01-15  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42827  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:51:02  

Additional Information
 Jupiter MOID = 1.66971 au 
 T_jup = 3.193 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.554695502544363E-15 -4.895555066597518E-15 -1.099253521000594E-13 1.345021031186786E-16 -1.266122833864172E-14 3.675362935206804E-16
q -4.895555066597518E-15 1.551015653547554E-14 3.883932174153641E-13 -1.901397556733526E-15 4.801221931546914E-14 -1.10474667562461E-15
tp -1.099253521000594E-13 3.883932174153641E-13 6.582325610045649E-9 -2.030117213023847E-11 1.119898796259288E-9 -3.493706776923547E-13
node 1.345021031186786E-16 -1.901397556733526E-15 -2.030117213023847E-11 1.416407367028496E-9 -1.410402967854783E-9 5.470812146336257E-12
peri -1.266122833864172E-14 4.801221931546914E-14 1.119898796259288E-9 -1.410402967854783E-9 1.597906389679981E-9 -5.411172879590826E-12
i 3.675362935206804E-16 -1.10474667562461E-15 -3.493706776923547E-13 5.470812146336257E-12 -5.411172879590826E-12 1.949924171309979E-11

[ 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 7.6   n/a MPO473761 IRAS observations used: 23
diameter diameter 85.734 km 1.961 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 27.066 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Galad, A.; Vilagi, J.; Kornos, L.; Gajdos, S. (2009) Minor Planet Bull. 36, 116-118.]
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.205   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.838   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=2.98, mean=5.97, max.=11.64) deg.
U-B UB 0.363   0.049 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=2.98, mean=5.97, max.=11.64) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
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)

100 Hekate (A868 NA)          Discovered 1868-Jul-11 by Watson, J. C. at Ann Arbor
Independent discovery July 18 by C. Wolf, Paris, was announced first.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A868 NA = 1955 QA 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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