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120 Lachesis (A872 GB)
Classification: Main-belt Asteroid          SPK-ID: 2000120
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 132 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05181598969565144 9.1879e-09  
a 3.117844836836714 9.3708e-09 au
q 2.956290620898542 2.7531e-08 au
i 6.963672878864529 2.7196e-07 deg
node 341.1633715191826 2.1098e-06 deg
peri 234.1021308387217 2.4535e-05 deg
M 341.1997712938358 2.2169e-05 deg
tp 2459305.512453632219
(2021-Apr-01.01245363)
0.00012374 TDB
period 2010.852309217056
5.51
9.0656e-06
2.482e-08
d
yr
n .1790285633359963 8.0712e-10 deg/d
Q 3.279399052774885 9.8564e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2859  
   data-arc span      54371 days (148.86 yr)  
   first obs. used      1872-04-25  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45299  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:19:12  

Additional Information
 Earth MOID = 1.95627 au 
 Jupiter MOID = 1.72282 au 
 T_jup = 3.204 
[ 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 7.78   n/a E2021B10 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. 2020-October); 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 (A872 GB)          Discovered 1872-Apr-10 by Borrelly, A. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A872 GB = A910 CF = A918 UB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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