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68 Leto (A861 HB)
Classification: Main-belt Asteroid          SPK-ID: 2000068
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 109 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1851751872003273 3.5901e-08  
a 2.782394239593489 5.447e-09 au
q 2.267163865411652 9.9427e-08 au
i 7.961436922014987 3.923e-06 deg
node 44.07992331340085 3.0356e-05 deg
peri 304.43828884 3.2283e-05 deg
M 346.5297769374125 1.2005e-05 deg
tp 2459063.930584298026
(2020-Aug-02.43058430)
5.662e-05 TDB
period 1695.22139620032
4.64
4.978e-06
1.363e-08
d
yr
n .212361642442047 6.236e-10 deg/d
Q 3.297624613775326 6.4556e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2687  
   data-arc span      57309 days (156.90 yr)  
   first obs. used      1863-11-30  
   last obs. used      2020-10-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50652  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:33:44  

Additional Information
 Earth MOID = 1.2729 au 
 Jupiter MOID = 2.17419 au 
 T_jup = 3.293 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 6.9   n/a MPO492748 IRAS observations used: 21
magnitude slope G 0.05   n/a PDS3 (MPC 17257) Fit
diameter diameter 122.509 km 3.137 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 14.848 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1980) Icarus 43, 20-32.]
[Surdej, J.; Schober, H.J. (1980) Astron. Astrophys. Suppl. Ser. 41, 335-338.]
[Lopez-Gonzalez, M.J.; Rodriguez, E. (2005) Planet. Space Sci. 53, 1147-1165.]
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Behrend, R. (2013) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
geometric albedo albedo 0.228   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.845   0.023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=2.68, mean=11.30, max.=17.60) deg.
U-B UB 0.488   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=2.68, mean=11.30, max.=17.60) 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

68 Leto (A861 HB)          Discovered 1861-Apr-29 by Luther, R. at Dusseldorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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