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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 130 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0518159604622261 3.7545e-08  
a 3.117844837890006 1.0679e-08 au
q 2.956290713042541 1.1735e-07 au
i 6.963665902321889 4.1634e-06 deg
node 341.1634023901951 3.3786e-05 deg
peri 234.1021023687697 5.3402e-05 deg
M 341.1997735703902 4.2893e-05 deg
tp 2459305.512440969282
(2021-Apr-01.01244097)
0.00023972 TDB
period 2010.852310236036
5.51
1.0332e-05
2.829e-08
d
yr
n .1790285632452753 9.1983e-10 deg/d
Q 3.27939896273747 1.1233e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2741  
   data-arc span      54325 days (148.73 yr)  
   first obs. used      1872-04-25  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45092  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:43:36  

Additional Information
 Earth MOID = 1.95627 au 
 Jupiter MOID = 1.72282 au 
 T_jup = 3.204 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455578.5 (2011-Jan-17.0) TDB
Reference: JPL 130 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05798677104389835 3.7821e-08  
q 2.934193627393215 1.1948e-07 au
tp 2455271.944699257325
(2010-Mar-16.44469926)
0.00020832 TDB
node 341.4786124488534 3.3916e-05 deg
peri 231.9486437505236 4.9921e-05 deg
i 6.954097100131995 4.1567e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2741  
   data-arc span      54325 days (148.73 yr)  
   first obs. used      1872-04-25  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45092  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:43:36  

Additional Information
 Jupiter MOID = 1.72282 au 
 T_jup = 3.204 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.43039444264477E-15 -4.503507296122384E-15 -4.289910973704236E-13 -2.057074330419823E-15 -4.605907077365437E-14 1.40503225040396E-16
q -4.503507296122384E-15 1.427617671894099E-14 1.67429031833854E-12 4.218504900306275E-15 2.042153413597546E-13 2.514737913463015E-16
tp -4.289910973704236E-13 1.67429031833854E-12 4.3397142051087E-8 1.326897580908628E-11 7.652866141916111E-9 6.95437693755436E-12
node -2.057074330419823E-15 4.218504900306275E-15 1.326897580908628E-11 1.150305194778518E-9 -1.139297276673232E-9 1.652066981297913E-12
peri -4.605907077365437E-14 2.042153413597546E-13 7.652866141916111E-9 -1.139297276673232E-9 2.492150976471586E-9 -5.069381220451874E-13
i 1.40503225040396E-16 2.514737913463015E-16 6.95437693755436E-12 1.652066981297913E-12 -5.069381220451874E-13 1.727777812502331E-11

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 1.97262877145508 1.97262821620324 1.97262932670681 3.19082186033016 3.05328818814949 2430444.967116377 1.09894646006689 40.4688964290043 20.5060264614781 -87.0332587043774 2777883.75920032 T 130 CATAB v2.0f-lin.ifort 2021-Feb-24 00:43:44 2021-Feb-24 00:43
1952-Apr-26 07:21 < 00:01 Jupiter 1.73700912393222 1.73700870300427 1.73700954486026 2.65367515277342 2.46307254045727 2434128.806093540 0.957716568913389 62.4315490448732 18.0424623587081 -84.4316156296312 2954947.37509945 T 130 CATAB v2.0f-lin.ifort 2021-Feb-24 00:43:44 2021-Feb-24 00:43
1962-Jun-23 10:43 < 00:01 Jupiter 1.8564499089085 1.8564494554286 1.8564503623884 3.67841895891837 3.55221725954368 2437838.946772598 0.725518658870054 69.5025693755975 19.0578533162817 87.0477782435375 3525027.11332812 T 130 CATAB v2.0f-lin.ifort 2021-Feb-24 00:43:44 2021-Feb-24 00:43
2024-Apr-23 00:21 < 00:01 Jupiter 1.8202094736209 1.82020905128715 1.82020989595464 2.52578261198739 2.33428596092543 2460423.514370640 0.303207551903042 43.1547227390705 6.95970251964484 -73.6033148133479 3283675.57489265 T 130 CATAB v2.0f-lin.ifort 2021-Feb-24 00:43:44 2021-Feb-24 00:43
2034-May-29 17:11 < 00:01 Jupiter 1.75599718050343 1.75599679611545 1.75599756489141 3.22606920966426 3.07291439340735 2464112.216139289 0.433898431260528 82.6390322432756 15.4100989125759 -89.5793661696311 3483435.32349662 T 130 CATAB v2.0f-lin.ifort 2021-Feb-24 00:43:44 2021-Feb-24 00:43
2096-Apr-17 11:35 00:01 Jupiter 1.92921267926917 1.9292121102619 1.92921324827632 2.99774963326378 2.84752543672303 2486715.982872271 1.39511706506665 43.7462607012082 19.083160939167 -88.1235415551269 2562143.13499022 T 130 CATAB v2.0f-lin.ifort 2021-Feb-24 00:43:44 2021-Feb-24 00:43
2106-May-15 10:28 00:02 Jupiter 1.740179563211 1.7401791526898 1.7401799737322 2.71507256717573 2.52945259053161 2490394.936300242 1.59671332038651 90.7635535128591 19.4620901586344 87.7069399835211 2993585.02286718 T 130 CATAB v2.0f-lin.ifort 2021-Feb-24 00:43:44 2021-Feb-24 00:43
2116-Jul-15 13:42 00:02 Jupiter 1.91403756555892 1.9140367930121 1.91403833810574 3.87941831575935 3.76361831762963 2494109.070558773 1.64694504760969 63.604347745721 34.2308358823542 84.7816187984028 2651575.60967324 T 130 CATAB v2.0f-lin.ifort 2021-Feb-24 00:43:44 2021-Feb-24 00:43
2178-May-12 19:11 00:03 Jupiter 1.79153451251557 1.79153384667154 1.79153517835949 2.43853027179505 2.23625728255697 2516690.299516278 2.82984556991098 49.7354475812285 25.978417778086 89.1275925020254 2874934.99553987 T 130 CATAB v2.0f-lin.ifort 2021-Feb-24 00:43:44 2021-Feb-24 00:43
2188-Jun-20 01:34 00:03 Jupiter 1.78615792131703 1.78615717343442 1.7861586692026 3.36428571790693 3.22024669831391 2520381.565547165 2.80975654177352 158.470075676854 19.5167967401453 -83.1731334674984 3112682.90731109 T 130 CATAB v2.0f-lin.ifort 2021-Feb-24 00:43:44 2021-Feb-24 00:43

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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