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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 131 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05181599086300472 9.1879e-09  
a 3.117844845055824 9.3711e-09 au
q 2.956290625052145 2.7531e-08 au
i 6.963672874976438 2.7196e-07 deg
node 341.1633720104569 2.1098e-06 deg
peri 234.1021279817108 2.4535e-05 deg
M 341.1997726568962 2.2169e-05 deg
tp 2459305.512446433815
(2021-Apr-01.01244643)		 0.00012374 TDB
period 2010.852317168422
5.51		 9.0658e-06
2.482e-08		 d
yr
n .1790285626280767 8.0714e-10 deg/d
Q 3.279399065059503 9.8567e-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.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45302  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 10:37:58  

Additional Information
 Earth MOID = 1.95627 au 
 Jupiter MOID = 1.72282 au 
 T_jup = 3.204 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457264.5 (2015-Aug-30.0) TDB
Reference: JPL 131 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05257808016472772 9.2477e-09  
q 2.953651968327559 2.7604e-08 au
tp 2457285.575736300765
(2015-Sep-20.07573630)		 0.00012344 TDB
node 341.1962413845353 2.1096e-06 deg
peri 232.622396897724 2.4148e-05 deg
i 6.964406144266722 2.7198e-07 deg
   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.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45302  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 10:37:58  

Additional Information
 Jupiter MOID = 1.72282 au 
 T_jup = 3.204 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.552045804563334E-17 -2.431796108876223E-16 -1.556702150893507E-13 -2.504809982759112E-15 -2.731310726406918E-14 5.623478238015141E-16
q -2.431796108876223E-16 7.620008944926107E-16 2.292041166077976E-13 7.447327665426557E-15 3.526865254097285E-14 -1.798490259701317E-15
tp -1.556702150893507E-13 2.292041166077976E-13 1.523763127720028E-8 -1.240186593098443E-11 2.970624810410328E-9 1.478915983289266E-12
node -2.504809982759112E-15 7.447327665426557E-15 -1.240186593098443E-11 4.450274226959255E-12 -6.408270280765675E-12 1.43446609320667E-13
peri -2.731310726406918E-14 3.526865254097285E-14 2.970624810410328E-9 -6.408270280765675E-12 5.831062796334418E-10 1.710689721205482E-13
i 5.623478238015141E-16 -1.798490259701317E-15 1.478915983289266E-12 1.43446609320667E-13 1.710689721205482E-13 7.397049313664857E-14

[ 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)		 Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1942-Mar-26 11:13 00:01 Jupiter 1.97262879136154 1.97262841986835 1.97262916285473 3.1908218148289 3.05328814201781 2430444.967042112 1.01334563760308 20.8579314988787 3.21697488201587 53.7720608407893 13387558.4780431 T 131 CATAB v2.0f-lin.ifort 2021-Mar-16 10:40:46 2021-Mar-16 10:40
1952-Apr-26 07:21 < 00:01 Jupiter 1.73700914547553 1.73700896969443 1.73700932125684 2.65367519957755 2.46307259333871 2434128.805966223 0.89289020831322 30.0091175616875 3.64793899277732 69.1653851749438 16042358.9127443 T 131 CATAB v2.0f-lin.ifort 2021-Mar-16 10:40:46 2021-Mar-16 10:40
1962-Jun-23 10:43 < 00:01 Jupiter 1.8564499004675 1.85644962248611 1.85645017844888 3.67841993179912 3.55221826640451 2437838.946689935 0.691870840002168 12.5955482631515 7.50746333079667 -22.7891611790905 7238792.98495812 T 131 CATAB v2.0f-lin.ifort 2021-Mar-16 10:40:46 2021-Mar-16 10:40
2024-Apr-23 00:21 < 00:01 Jupiter 1.82020958275555 1.82020944847218 1.82020971703892 2.52578219229626 2.33428551875686 2460423.514463146 0.247207406033254 4.63065543744369 1.89834186382551 55.7814623348199 13176119.9752476 T 131 CATAB v2.0f-lin.ifort 2021-Mar-16 10:40:46 2021-Mar-16 10:40
2034-May-29 17:11 < 00:01 Jupiter 1.75599712688958 1.7559969094154 1.75599734436386 3.22606954163076 3.07291473712651 2464112.216222015 0.355580774061154 24.5857030965885 4.33111049127749 -74.7184366412327 12628906.8803484 T 131 CATAB v2.0f-lin.ifort 2021-Mar-16 10:40:46 2021-Mar-16 10:40
2096-Apr-17 11:36 00:01 Jupiter 1.92921285422629 1.9292124286408 1.92921327981177 2.99775036554637 2.84752622162089 2486715.983150077 1.24483191135509 25.9543476255407 3.03217671031458 62.4586734043042 14737069.8221462 T 131 CATAB v2.0f-lin.ifort 2021-Mar-16 10:40:46 2021-Mar-16 10:40
2106-May-15 10:29 00:01 Jupiter 1.74017960993966 1.74017952237266 1.74017969750665 2.71507208099586 2.52945207384148 2490394.936550033 1.41954890990018 69.9144045861379 2.80196984712511 82.5134724566935 15995099.5256894 T 131 CATAB v2.0f-lin.ifort 2021-Mar-16 10:40:46 2021-Mar-16 10:40
2116-Jul-15 13:42 00:01 Jupiter 1.91403736516504 1.91403663893812 1.91403809139195 3.87941865033105 3.7636186501851 2494109.070821470 1.45044256722677 32.5320897844243 4.80742096354786 5.56305601300128 3494618.91664331 T 131 CATAB v2.0f-lin.ifort 2021-Mar-16 10:40:46 2021-Mar-16 10:40
2178-May-12 19:12 00:03 Jupiter 1.79153470922517 1.79153426394903 1.79153515450142 2.43852982642381 2.2362568201151 2516690.299978136 2.54581652155396 31.3508248128394 2.1411776262795 50.7130528734081 13275962.9730629 T 131 CATAB v2.0f-lin.ifort 2021-Mar-16 10:40:46 2021-Mar-16 10:40
2188-Jun-20 01:35 00:03 Jupiter 1.78615774012546 1.78615704270581 1.78615843754786 3.36428535515612 3.22024630439914 2520381.565978400 2.51377602625296 122.527392172448 6.32790702790871 -78.862734089841 9386532.06061187 T 131 CATAB v2.0f-lin.ifort 2021-Mar-16 10:40:46 2021-Mar-16 10:40

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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