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108 Hecuba (A869 GB)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000108
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 60 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0564335272662605 1.9496e-08  
a 3.245260635956477 8.3455e-09 au
q 3.062119131371105 6.1521e-08 au
i 4.222741896958129 5.5063e-07 deg
node 349.9046057407975 8.3087e-06 deg
peri 208.4665833787732 1.6429e-05 deg
M 106.6129980286289 1.5496e-05 deg
tp 2458764.116608789895
(2019-Oct-07.61660879)
9.2064e-05 TDB
period 2135.368341996204
5.85
8.2369e-06
2.255e-08
d
yr
n .1685891810419282 6.5031e-10 deg/d
Q 3.428402140541849 8.8164e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3301  
   data-arc span      51649 days (141.41 yr)  
   first obs. used      1880-01-26  
   last obs. used      2021-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44025  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:32:51  

Additional Information
 Earth MOID = 2.06165 au 
 Jupiter MOID = 1.53954 au 
 T_jup = 3.176 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455334.5 (2010-May-18.0) TDB
Reference: JPL 60 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05131458914422882 1.8735e-08  
q 3.084742871660001 5.7608e-08 au
tp 2454431.981694761667
(2007-Nov-27.48169476)
0.00010872 TDB
node 350.3136624788642 8.2261e-06 deg
peri 196.778377685825 1.8984e-05 deg
i 4.247629920884202 5.5539e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3301  
   data-arc span      51649 days (141.41 yr)  
   first obs. used      1880-01-26  
   last obs. used      2021-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44025  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:32:51  

Additional Information
 Jupiter MOID = 1.53954 au 
 T_jup = 3.176 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.510030919674369E-16 -1.068170481898696E-15 5.54586441149471E-13 -4.545595569835005E-14 1.174090283047813E-13 3.308201859916287E-15
q -1.068170481898696E-15 3.318695379532377E-15 -1.792883468596032E-12 1.33103365343197E-13 -3.557803816933501E-13 -1.008668284384147E-14
tp 5.54586441149471E-13 -1.792883468596032E-12 1.182080774848233E-8 -2.399284315874963E-11 1.868200788206939E-9 1.536353816774168E-11
node -4.545595569835005E-14 1.33103365343197E-13 -2.399284315874963E-11 6.766853622858354E-11 -6.838758678857844E-11 -2.653884450976093E-12
peri 1.174090283047813E-13 -3.557803816933501E-13 1.868200788206939E-9 -6.838758678857844E-11 3.60376351906447E-10 4.911607466202066E-12
i 3.308201859916287E-15 -1.008668284384147E-14 1.536353816774168E-11 -2.653884450976093E-12 4.911607466202066E-12 3.084630874023926E-13

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 8.06   n/a E2021B10 IRAS observations used: 14
diameter diameter 75.498 km 1.891 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 14.256 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Blanco, C.; Di Martino, M.; Lazzarin, M.; Cellino, A.; et al. (1994) Seventy-Five Years of Hirayama Asteroid Families, ASP Conf. Ser. 63, 280-285.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2013) Minor Planet Bull. 40, 158-160.]
[Pilcher, F. (2014) Minor Planet Bull. 41, 250-252.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.148   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
B-V BV 0.855   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=2.51, mean=7.27, max.=10.66) deg.
U-B UB 0.502   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=2.51, mean=7.27, max.=10.66) 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 Sl   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)

108 Hecuba (A869 GB)          Discovered 1869-Apr-02 by Luther, R. at Dusseldorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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