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JPL Small-Body Database Browser
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100 Hekate
Classification: Main-belt Asteroid          SPK-ID: 2000100
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1692041577249139 4.1108e-08  
a 3.087283252207346 1.3367e-08 au
q 2.564902089859369 1.2798e-07 au
i 6.431726467934714 4.6779e-06 deg
node 127.1913928999927 3.8817e-05 deg
peri 184.5787771812822 4.1438e-05 deg
M 246.4283277019856 1.7474e-05 deg
tp 2459225.572888083850
(2021-Jan-11.07288808)
9.8083e-05 TDB
period 1981.358864908783
5.42
1.2868e-05
3.523e-08
d
yr
n .1816934864127067 1.18e-09 deg/d
Q 3.609664414555323 1.5628e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2614  
   data-arc span      54173 days (148.32 yr)  
   first obs. used      1871-01-15  
   last obs. used      2019-05-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45741  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:02:54  

Additional Information
 Earth MOID = 1.54987 au 
 Jupiter MOID = 1.67148 au 
 T_jup = 3.194 
[ 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-January); Warner et al., 2009 Published Reference List:
[Galad, A.; Vilagi, J.; Kornos, L.; Gajdos, S. (2009) Minor Planet Bull. 36, 116-118.]
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          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
 1955 QA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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