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JPL Small-Body Database Browser
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108 Hecuba
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 50 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05564043060219897 3.5488e-08  
a 3.237466442979172 1.3929e-08 au
q 3.057332416031642 1.1626e-07 au
i 4.220237370759275 4.5597e-06 deg
node 349.9785253900732 4.1481e-05 deg
peri 206.0038768378291 5.3644e-05 deg
M 42.16619650662552 3.3394e-05 deg
tp 2458751.288391774982
(2019-Sep-24.78839177)
0.00019813 TDB
period 2127.680141767336
5.83
1.3732e-05
3.76e-08
d
yr
n .1691983644219049 1.092e-09 deg/d
Q 3.417600469926702 1.4704e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2763  
   data-arc span      51139 days (140.01 yr)  
   first obs. used      1880-01-26  
   last obs. used      2020-01-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46764  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:17:25  

Additional Information
 Earth MOID = 2.05666 au 
 Jupiter MOID = 1.55107 au 
 T_jup = 3.178 
[ 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 8.0   n/a MPO473761 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. 2019-August); 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          Discovered 1869-Apr-02 by Luther, R. at Dusseldorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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