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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 99 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05407423115769507 4.0651e-08  
a 3.122877698239006 1.4862e-08 AU
q 2.954010487707219 1.2577e-07 AU
i 6.957176004008374 4.5665e-06 deg
node 341.2204177721976 3.9914e-05 deg
peri 231.4420707049933 5.7444e-05 deg
M 274.4612919199758 4.2998e-05 deg
tp 2457279.450992001130
(2015-Sep-13.95099200)
0.00024174 JED
period 2015.723185333827
5.52
1.4389e-05
3.939e-08
d
yr
n .1785959513783039 1.2749e-09 deg/d
Q 3.291744908770793 1.5665e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1286  
   data-arc span      51848 days (141.95 yr)  
   first obs. used      1872-04-25  
   last obs. used      2014-04-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .58164  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 13:09:08  

Additional Information
 Earth MOID = 1.95551 AU 
 T_jup = 3.202 
[ 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 Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) Published Reference List:
[Bembrick, C.S.; Allen, B. (2005) Minor Planet Bul. 32, 45-46.]
[Pilcher, F. (2009) Minor Planet Bul. 36, 100-102.]
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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