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68 Leto
Classification: Main-belt Asteroid          SPK-ID: 2000068
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 88 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1871779579476075 3.0308e-08  
a 2.780997719054987 5.4495e-09 AU
q 2.26045624494532 8.387e-08 AU
i 7.971901222876856 3.6495e-06 deg
node 44.13690335738662 2.7779e-05 deg
peri 304.9295194578459 2.9367e-05 deg
M 281.1376147826773 9.5426e-06 deg
tp 2457371.579346757568
(2015-Dec-15.07934676)
4.5254e-05 JED
period 1693.945275235992
4.64
4.979e-06
1.363e-08
d
yr
n .2125216234921442 6.2467e-10 deg/d
Q 3.301539193164654 6.4695e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1635  
   data-arc span      55250 days (151.27 yr)  
   first obs. used      1863-11-30  
   last obs. used      2015-03-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .62518  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 15:58:08  

Additional Information
 Earth MOID = 1.26652 AU 
 T_jup = 3.293 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 6.78 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 21
magnitude slope G 0.05   n/a PDS3 (MPC 17257) Fit
diameter diameter 122.57 km 5.3 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 21
rotation period rot_per 14.848 h n/a LCDB (Rev. 2015-May); Warner et al., 2009 Published Reference List:
[Surdej, J.; Schober, H.J. (1980) Astron. Astrophys. Suppl. Ser. 41, 335-338.]
[Harris, A.W.; Young, J.W. (1980) Icarus 43, 20-32.]
[Lopez-Gonzalez, M.J.; Rodriguez, E. (2005) Planetary and Space Science 53, 1147-1165.]
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
[Behrend, R. (2013) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.2283   0.021 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 21
B-V BV .845 mag .023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=6; phase (min.=2.68, mean=11.30, max.=17.60) deg.
U-B UB .488 mag .025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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          Discovered 1861-Apr-29 by Luther, R. at Dusseldorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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