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JPL Small-Body Database Browser
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120 Lachesis
Classification: Main-belt Asteroid          SPK-ID: 2000120
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 123 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0522276155552853 4.0382e-08  
a 3.119512826343674 1.1812e-08 au
q 2.956588109729615 1.247e-07 au
i 6.961644652909204 4.2341e-06 deg
node 341.1739925253169 3.6924e-05 deg
peri 233.6346932270868 5.663e-05 deg
M 234.3178966884304 4.5132e-05 deg
tp 2459303.086061508331
(2021-Mar-29.58606151)
0.00025369 TDB
period 2012.466178386399
5.51
1.143e-05
3.129e-08
d
yr
n .1788849938778345 1.016e-09 deg/d
Q 3.282437542957732 1.2429e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2348  
   data-arc span      53907 days (147.59 yr)  
   first obs. used      1872-04-25  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47611  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:02:00  

Additional Information
 Earth MOID = 1.95778 au 
 Jupiter MOID = 1.72172 au 
 T_jup = 3.203 
[ 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 7.8   n/a MPO502153 IRAS observations used: 15
diameter diameter 155.132 km 1.133 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 46.551 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Bembrick, C.S.; Allen, B. (2005) Minor Planet Bull. 32, 45-46.]
[Pilcher, F. (2009) Minor Planet Bull. 36, 100-102.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.058   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.707   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=.80, mean=5.33, max.=16.29) deg.
U-B UB 0.383   0.019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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