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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1695552879402614 3.9506e-08  
a 3.089431761799603 1.1629e-08 au
q 2.565602269855882 1.2414e-07 au
i 6.431994762522729 4.4428e-06 deg
node 127.1816265261464 3.8207e-05 deg
peri 184.3863361588662 4.0606e-05 deg
M 319.3062924396425 1.6235e-05 deg
tp 2459224.702833292312
(2021-Jan-10.20283329)
8.9933e-05 TDB
period 1983.427532758412
5.43
1.1199e-05
3.066e-08
d
yr
n .1815039844179924 1.0248e-09 deg/d
Q 3.613261253743324 1.3601e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2876  
   data-arc span      54625 days (149.56 yr)  
   first obs. used      1871-01-15  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43533  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:09:49  

Additional Information
 Earth MOID = 1.55137 au 
 Jupiter MOID = 1.66971 au 
 T_jup = 3.193 
[ 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 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. 2019-August); 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

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