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120 Lachesis
Classification: Main-belt Asteroid          SPK-ID: 2000120
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 109 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05251656751783952 3.9711e-08  
a 3.11739533532647 1.3397e-08 au
q 2.953680432718999 1.2333e-07 au
i 6.964260713246039 4.4963e-06 deg
node 341.1942722930662 3.7611e-05 deg
peri 232.6831676794258 5.5302e-05 deg
M 20.52640938601902 4.1301e-05 deg
tp 2457285.870411251843
(2015-Sep-20.37041125)
0.00023055 JED
period 2010.417466263933
5.50
1.296e-05
3.548e-08
d
yr
n .1790672862930342 1.1543e-09 deg/d
Q 3.281110237933941 1.4101e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1438  
   data-arc span      52348 days (143.32 yr)  
   first obs. used      1872-04-25  
   last obs. used      2015-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .57319  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Oct-05 13:02:20  

Additional Information
 Earth MOID = 1.95432 au 
 Jupiter MOID = 1.72268 au 
 T_jup = 3.204 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.75 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
diameter diameter 174.10 km 2.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
rotation period rot_per 46.551 h n/a LCDB (Rev. 2015-December); Warner et al., 2009 Published Reference List:
[Bembrick, C.S.; Allen, B. (2005) Minor Planet Bul. 32, 45-46.]
[Pilcher, F. (2009) Minor Planet Bul. 36, 100-102.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2015) Astron. Astrophys., in press.arXiv:1510.07422]
geometric albedo albedo 0.0463   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
B-V BV .707 mag .013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=7; phase (min.=.80, mean=5.33, max.=16.29) deg.
U-B UB .383 mag .019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=7; phase (min.=.80, mean=5.33, max.=16.29) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B C   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)

120 Lachesis          Discovered 1872-Apr-10 by Borrelly, A. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A910 CF = A918 UB 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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